# Vertical Seismic Acceleration

The seismic design conditions are as follows: (a) Natural frequency: 30Hz or higher (b) Anti-acceleration: 3G or higher in horizontal direction, 2G or higher in vertical direction Figure 1 shows the development process of the seis-mic-resistant switchboard. The first character indicates the sample rate of the data, examples are E=100Hz, B=40 or 50Hz, H=80 or 100 Hz. The seismic response spectrum analysis was performed as per the RRS of SSE 5% (Required Response Spectrum of Safe Shutdown Earthquake with 5% damping) prescribed in KBC 2009 [6] and ASCE 7-10 [7]-[9]. The ground-motion hazard, per se, will be mitigated by designing the structures to applicable codes and standards. Seismic definition, pertaining to, of the nature of, or caused by an earthquake or vibration of the earth, whether due to natural or artificial causes. seismic loading and a common sense of the vertical seismic acceleration effect represented by 0. Keywords: - Acceleration time history, Kobe earthquake, Pile Foundation, Response quantity Vertical acceleration. so, considering a Zero Period Acceleration of also 0. prediction. design horizontal and vertical acceleration coefficients (= , respectively) pseudo-static seismic coefficient corresponding to return. However, during seismic events, the hydrodynamic load originating from the seismic acceleration of liquid in the tank starts to act in the direction of the earthquake motion. The passive seismic experiment was deployed 3 meters north of the central station. Seismic Resolution: Vertical and Horizontal Overview. Experimental Time Histories of Base Displacement, Structure Shear and 6th Floor Displacement with Respect to Base and Base Shear-Displacement Loop in Sliding System with Viscous Dampers for Mexico City Input (0. Seismic Sloshing in a Horizontal Liquid-Storage Tank StrongMotions Inc. system typically consists of horizontal and vertical structural elements. Read "Soil slopes under combined horizontal and vertical seismic accelerations, Earthquake Engineering and Structural Dynamics" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. The maximum vertical seismic acceleration parameter shall be taken as. In this figure mechanism of variation of inertia force under vertical acceleration and rocking under horizontal ground motion have been plotted. In order to study the effect of vertical acceleration in seismic performance of buildings, an 8-story non-ductile RC frame shown in Figure 1 is employed. Seismic design provisions remained in an appendix of the 1935 UBC (ICBO, 1935). Again they have considered effect of horizontal seismic acceleration due to vertically propagating shear waves. Once the need for restraint is determined, the magnitude of the restraint must be evaluated to select the actual components. Such response. 4 was added to separate the horizontal and vertical components of the seismic load and provide a reconstituted version of the load combinations provided in Section 2. Mw/ depth [km]. acceleration history at base of structure – Typically requires use of several records – Elastic or inelastic response – Time consuming and results can vary substantially between records Shaking Time Sa T zResponse Spectrum Analysis – Elastic response – Determine peak responses for each mode of response – Combine modal responses (SRSS, CQC). The curve is not symmetric with respect to 8=0 axis, and the. Seismic loads created in a structure are the result of the base-motion that can be prescribed for FAST simulations as one of acceleration, velocity, or displacement. 2 S Ds be applied to dead load. The vertical acceleration is typically taken as two thirds of the horizontal acceleration component for the same response spectral curve. The fundamental form of vertical seismic acceleration can be expressed as: (1) a (t) = ∑ k a peak, k sin (2 π f k t + ϕ k) where a peak, k =-a max, k g is the peak acceleration (“–” indicates the direction of gravity force), f k is the vibrating frequency and ϕ k is the phase angle of the k-th sinusoidal wave, respectively. Seismic Sloshing in a Horizontal Liquid-Storage Tank StrongMotions Inc. It includes the wave height of the rigid tank, the deformable tank with the original seismic acceleration, the deformable tank with doubled acceleration and the potential theory. seismic network exists. JNES performed a series of seismic tests of motor-operated fans in ventilation systems for the purpose of acquiring capacity data under horizontal excitations up to 6 g or more and under vertical 22 nd Conference on Structural Mechanics in Reactor Technology. Chart and Diagram Slides for PowerPoint - Beautifully designed chart and diagram s for PowerPoint with visually stunning graphics and animation effects. These stations, along with CNSN (Canadian National Seismic Network) sites have provided recordings of fifty-four small to moderate earthquakes from which an initial measurement of site effects can be made based on two methods: a) comparison to the regional ground model, and b) horizontal-to-vertical ratios. The formula for calculating acceleration is: [math]a(t) = dv(t)/dt [/math] or also more simply[math]: a = v/t[/math] Also, you can utilize (depending on the situation) newton's second law equation which is: [math]Force = mass × acceleration[/math]. The first step in static seismic analysis is to collect the seismic coefficient. However, according to previous research, vertical peak ground acceleration (PGA) can be higher than the horizontal peak acceleration in the same earthquake, which may contribute to structural collapse. This produces the greatest load on the bushing. The maximum analytical or test acceleration at which the Equipment can satisfy the performance criteria as defined in Section 5. Peak ground acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. The piezoelectric (crystal) element is squeezed between the mass and the base. 167g and the design spectral response acceleration at 1-second. However, according to previous research, vertical peak ground acceleration (PGA) can be higher than the horizontal peak acceleration in the same earthquake, which may contribute to structural collapse. 3 and S DS = 1. Studies for acceptance, a thesis entitled “Seismic sensing: Comparing geophones and accelerometers using laboratory and field data” submitted by Michael S. Engineering, Univ. important issue for seismic safety assessments of nuclear power plants. The passive seismic experiment was deployed 3 meters north of the central station. The influence of the vertical component of ground motion is often introduced by the ratio ( is the peak vertical acceleration and is the peak horizontal acceleration). In this design optimization, the weighting factor was 0. Seismic Maps The bases for the seismic ground motion (MCE) and long-period transition (T L) maps in Chapter 22 of ASCE 7-05 were established by, respectively, the Building Seismic Safety Council (BSSC) Seismic Design Procedures Group, also referred to as Project ’97, and Technical Subcommittee 1 (TS-1) of the 2003 Provisions Update Committee. For horizontal vessels, all three values are used. AN ALTERNATIVE PROCEDURE FOR SEISMIC ANALYSIS AND DESIGN OF TALL BUILDINGS LOCATED IN THE LOS ANGELES REGION 2017 Edition with 2018 Supplements A consensus document developed by the Council: Dr. Our horizontal and vertical seismic testing facilities, manufactured by the Team Corporation, offer low frequency, high displacement seismic vibration capabilities to meet the Telcordia GR-63-CORE Zone 4 seismic testing. The net seismic vertical uplift capacity factor for a unit weight component of soil (Fγd) is estimated. Abstract Although it has been proven that seismic isolation is an effective technology for seismic protection of structures and equipment, most existing isolation systems are for mitigating horizontal ground motions, and in practice there are very few vertical isolation systems. In the pseudo-static approach, seismic forces are represented as inertial body forces acting on the wall, in addition to other static forces. 8) Vertical Seismic Load Effect – E v [12. Earthquake shaking generally occurs in all three directions. Seismic waves are produced by earthquakes. The methodology employed in this study could simulate a real vertical seismic acceleration and address the major nonlinear characteristics of seismic-induced oscillations by the comparisons between the results caused by the real vertical seismic acceleration and the simulated wave. (4) Earthquake Loads: In the 1997 UBC, the earthquake load (E) is a function of both the horizontal and vertical components of the ground motion. The Hayward fault was the source of two large earthquakes in 1836 and 1868 that caused surface rupture along as much as 64 km of its trace. horizontal and vertical seismic acceleration, for increasing levels of seismic intensity. Step 23 – Compute Stability Coefficient. "The vertical ground acceleration used in combination with the horizontal base shear should be 80% of the design horizontal ground acceleration. (2) The sensing elements of the Type A triaxial accelerometer are aligned as follows: (i) Align one sensitive axis parallel to the vertical bulkhead and coincident with midsagittal planes, with the seismic mass center located from 0. Each building shall be assigned to the most severe seismic design category in accordance with Table 9. Surface waves in earthquakes can be divided into two types. designed to observe acceleration time history of two horizontal and one vertical components. The computation of each static and dynamic pressure acting on retaining wall need more. The acceleration output on the vertical axis is the +1G vector multiplied by the cosine of the angle between the vertical axis of the sensor and the true +1G plumb line. Home; Business. SEISMIC HAZARD UPTIME INSTITUTE in its standard Operational Sustainability limits the level of Seismic Activity in 0. Popular Answers ( 1) Generally the peak horizontal acceleration will be in the range of 0. 2 Strength Load Combinations. called a vertical seismic profile or VSP), and writes an ASCII file which can be used for plotting. For more information and method of calculating the earth pressure due to the seismic effects, refer other post in this blog - Seismic Design of Retaining Walls. Earthquake time history data is converted into a "response spectrum". S 1 = one second period spectral acceleration per USGS 2010 Seismic Design Maps (see SEI/ASCE7) F v = one second period site coefficient (Site Class D) Before jumping into an example, let's discuss a few details. type or the vertical location within a building, can have a large effect on the seismic response of a structure and its contents. High resolution seismic refraction tomography has proved to be a useful tool to effectively estimate depth of blast induced damage in a mine face. If the level of acceleration is combined with duration, the power of destruction is defined. Shear lag effect of curved box girder under multi-dimensional seismic excitation is studied in this paper. The Richter scale is based on the maximum amplitude of certain seismic waves, and seismologists estimate that each unit of the Richter scale is a 31 times increase of energy. Aslıhan Yolcu, Acceleration-Displacement Response Spectra (ADRS) For Design Of Seismic Isolation Systems In Turkey Osman Onur Akyazı, Evaluating Site Effects For Istanbul Seismic Downholes: Numerical Studies. The upward vertical acceleration will reduce the normal force which friction relies on. shall include both horizontal and vertical effects, E = E h ± E v (AISC 7-05 Eq. In view of the maximum vertical acceleration in. 0 displacement (cm) 0. Geophones, unlike hydrophones, detect motion rather than pressure. LUNG2 ABSTRACT Repeated observations from recent earthquakes show that the vertical acceleration can be amplified significantly and even become greater than the horizontal acceleration in certain situations. Imperial County in California, for example, has an acceleration coefficient of 0. 232 usc station #14 - channel 3 hmlvl. and the maximum ground acceleration coincide. Following an example by Austin (1996), the response of the building in Figure 3(a) is determined assuming an acceleration response spectrum (Figure 3(b)) and setting e=-2. Certified Product Table” S DS See attachment, “I. Yield seismic coefﬁcients are also provided. seismic synonyms, seismic pronunciation, seismic translation, English dictionary definition of seismic. Carvalho, M. Seismogram—real-time record, made of metal tape, of seismic waves. GLOSSARY OF SEISMIC TERMINOLOGY Acceleration - The time rate of velocity change, commonly measured in "g" (an acceleration of 32 ft/sec/sec or 980 cm/sec/sec = gravity constant on earth). Vertical distribution of seismic base shear; Important Note on seismic load effects on ASCE 7-05,10 Sec 12. Seismic Load Information: Spectral Response Acceleration (Ss) - IBC. For more information and method of calculating the earth pressure due to the seismic effects, refer other post in this blog - Seismic Design of Retaining Walls. 2 Strength Load Combinations. A large number of papers have focused on plan irregularity resulting in torsion in structural systems. Ducts are suspended from hangers 12 in. Since the magnitude of the vertical ground acceleration component is usually less than the horizontal ground acceleration component, vertical seismic loads are not considered in the design of most structures. Peru’s seismicity comprises seismic activity associated´ with the collision and subduction of the Nazca plate against. Acceleration can be calculated by dividing the change in velocity (measured in metres per second) by the time taken for the change (in seconds). INFUENCE OF UNCERTAIN VERTICAL LOADS AND ACCELERATIONS ON THE SEISMIC PERFORMANCE OF AN RC BUILDING1 Dimitrios Vamvatsikos, Dept. The computation of each static and dynamic pressure acting on retaining wall need more. free air and inertial effects exerted by atmospheric phenomena on the sensor mass. "The Qualitative Analysis of Vertical Seismic Acceleration Effect on a Single Nuclear-Coupled Boiling Channel Natural Circulation Loop. Stewart, Department of. The results under static and seismic conditions are determined for various combinations of input parameters, such as soil friction angle, embedment ratio, and seismic acceleration. A simple method of compensating for interfering seismic effects on microphones is described. All moment-resisting frames are located at the perimeter of the building. Seismic Hazard Map of the 48 Conterminous States, Alaska, and Hawaii From: United States Geological Survey. (4) Earthquake Loads: In the 1997 UBC, the earthquake load (E) is a function of both the horizontal and vertical components of the ground motion. It defines an operator used to increase the vertical resolution of seismic data. It is used for the vertical portion of seismic load and is typically multiplied by 0. 1 GENERAL 11. 2*DL in ASCE 7 Section 12. Horizontal and/or vertical forces, which are calculated as products of the seismic coefficients KH, KV and the weight of the structures are applied to the structures as shown in Figure 1. These are illustrated in Figure 8. By showing that the various gage records can be differentiated and/or integrated, the number of measurements of displacement, velocity, and acceleration can be increased two- or. Peak gravitational acceleration, PGA, is what is experienced by a particle on the ground. 1 – Hydrodynamic pressure on tank wall due to vertical ground acceleration may be taken as () h y 1 h g A p v v − ρ = ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ × × = g S R I Z A a v 2 3 2 where y = vertical distance of point under consideration from bottom of tank wall, and g S a = Average response acceleration coefficient given by Figure 2. The roles of anchor embedment ratio, soil friction angle, and anchor inclination in determination of the seismic uplift capacity are also discussed. A Bayesian Probabilistic Approach to Damage Detection for Civil Structures. 4Av) 6 H Maximum design product level, m (ft) 7 HS Thickness of soil, m (ft). , which is DEM based on continuum mechanics, is favorable to simulate large deformation. 19 is considered to be in a high category. Exceptions: 1. - (US code only) If mass data has been entered in the Time Period page for the calculation of the vessel's fundamental period, that data can also be used by the program to determine the center of gravity. " Proceedings of the 2018 26th International Conference on Nuclear Engineering. Chapter 11 SEISMIC DESIGN CRITERIA 11. Choudhury and Nimbalkar (2006) have incorporated the effect of vertical seismic acceleration due to vertically propagating primary waves through the backfill soil. In the first one we subtracted the simultaneously recorded ocean bottom pressure signal from the vertical seismic acceleration in time domain. The seismic mass is clamped to the base by an axial bolt bearing down on a circular spring. The down hole instruments are located at depths of 6 m, 11 m, 17 m, and 47 m. 15 and S1 ≤ 0. This modified acceleration excites the building mass, which generates the inertia forces (F = m ( a) at each level (i. urements of ground motion. Install seismic separation assemblies where the sprinkler system crosses building seismic separation joints at ground level and above. design horizontal and vertical acceleration coefficients (= , respectively) pseudo-static seismic coefficient corresponding to return. Vertical ground acceleration is ignored based on the presumption that horizontal and vertical accelerations associated with a seismic event do not coincide. The usual application of this method is in seismic (earthquake) analysis. TIP 316: Combined Horizontal-Vertical Seismic Isolation System for High-Voltage Power Transformer. Seismic performance category is a function of acceleration coefficient and relates to seismic zone. A screen-cap of that example is inserted below. Up to 2,300 lbs (1,040 kg) of payload can be supported on a 48x48 inch (1. Seismic Maps The bases for the seismic ground motion (MCE) and long-period transition (T L) maps in Chapter 22 of ASCE 7-05 were established by, respectively, the Building Seismic Safety Council (BSSC) Seismic Design Procedures Group, also referred to as Project '97, and Technical Subcommittee 1 (TS-1) of the 2003 Provisions Update Committee. A response spectrum is a plot of the peak or steady-state response (displacement, velocity or acceleration) of a series of oscillators of varying natural frequency, that are forced into motion by the same base vibration or shock. An analytical procedure is presented for the calculation of the statistical properties of the response of a linear elastic tall building under earthquake excitations. (Although the vertical acceleration can be included in a pseudo-static analysis, it is rarely used in practice, as explained below. When the building is subject to seismic excitation, the horizontal elements—roof and floor slabs, bending in their own plane, act as diaphragms to transmit the forces horizontally from the point of origin to the vertical elements of the SFRS (Figure 1-1). Vertical Distribution of Seismic Base Shear When performing equivalent lateral force analysis, the earthquake load is distributed vertically over the height of the building by applying a portion of the seismic base shear to each level of the building, consistent with the assumption of concentrated floor masses. Horizontal and Vertical Seismic Acceleration Demands in Multi-Storey Buildings. As a consequence, high vertical seismic. if an earthquake is modeled as having a 0. Heavy duty relay contacts. Since 1967 the U. In view of the maximum vertical acceleration in. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. and vertical drifts and three-dimensional acceleration time history, obtained as aforementioned, were conducted with the multi-modal loading apparatus. " Horizontal and Vertical Design. , 7 percent probability of exceedance in 75 years for other structures, which is an approximate return period of 1,000 years). So unless you reduce the friction factors for seismic loads based on vertical acceleration, which cannot be done easily, it is best to ignore friction since that is likely to produce conservative results. A response spectrum shows the maximum response of a single degree of freedom oscillator to a particular ground motion. Secondly, elastic dynamic time-history analysis focused on shear lag effect is carried out, where 4 working conditions, 3-D seismic, longitudinal-vertical seismic, vertical seismic and transverse seismic only, are considered. Seismic Base Isolation Technique for Building Earthquake Resistance It is easiest to see the principle at work by referring directly to the most widely used of these advanced techniques, known as base isolation. Figure 7 shows the vertical displacement of the edge of the liquid free surface (point A of Figure 3). Certified Product Table”(Design spectral response acceleration at short period, g) = a. Therefore, we will focus the discussion on the acceleration. Peak vertical accelerations from a suite of 585 strong ground motion records from 76 worldwide earthquakes are fit to an attenuation model that has a magnitude dependent shape. Restrain branch lines against vertical movement. The 1997 UBC seismic design provisions are based on strength-level design rather than service-level design. Therefore, the equivalent seismic coefficient should be just a percentage of the site-adjusted PGA. Intensity map for the 1994 Northridge earthquake. hazard analysis using discrete faults and seismic slope stability analysis in NW Pakistan. If you're behind a web filter, please make sure that the domains *. Context Seismic base isolation systems developed by BPA research and implemented for high-voltage power transformers, so far, only provide protection against the horizontal components of earthquake motion. SEISMIC DESIGN CRITERIA VERSION 2. Seismic loads are generated by the ground's acceleration being transferred to the foundation, according to the site soil characteristics (S) and then the building's structural system characteristics (R). 5% damping = 1. Table III-3-1 shows the maximum acceleration values of seismic ground motions in three components, i. This approach uses a single, monotonically-applied horizontal and/or vertical acceleration to represent earthquake loading. Adequate and simple methods to consider the combined effects of the three ground motion components for seismic design are proposed in this work. The channel name allows one to distinguish between data from different kinds of sensors. Calculation of the elastic response spectrum in terms of spectral acceleration and spectral displacement representing the seismic action in the horizontal or vertical direction. Seismic Design of Deep Foundations Introduction Observations from recent earthquakes have shown that pile foundations are susceptible to significant damage when subjected to loads induced by large seismic events. 806 65 meters per second per second (m/s2). Figure 1 summarizes the amplification factor the numerical results results; overallre within the , we range of experimental results reported by Kencana (2012). Eco-rubber seismic-isolation foundation systems: a cost-effective way to build resilience G. Evaluating Seismic Requirements in Specifications Updated April 29, 2003 When reviewing a Specification, there are 4 or 5 items that are critical in determining the extent of the seismic componentry that will be required. PGA (peak acceleration) is what is experienced by a particle on the ground, and SA is approximately what is experienced by a building, as modeled by a particle mass on a massless vertical rod having the same natural period of vibration as the building. of 11th European Conf. If the direction of acceleration is in the same direction as that of velocity then the object is said to be speeding up. 9 kg] Sensor Geophone Accelerometer (GAC-D) Sensitivity >0. Lateral Loads Manual 2. Anna University of Technology. The maximum design acceleration of the seismic forces is the demand. INFUENCE OF UNCERTAIN VERTICAL LOADS AND ACCELERATIONS ON THE SEISMIC PERFORMANCE OF AN RC BUILDING1 Dimitrios Vamvatsikos, Dept. The forces from seismic activity yield bo th a vertical and a horizontal acceleration. Accelerometer. Seismic Base Isolation Technique for Building Earthquake Resistance It is easiest to see the principle at work by referring directly to the most widely used of these advanced techniques, known as base isolation. AX, AY, and AZ are the acceleration outputs from each orthogonal axis and V is the local gravity vector, calculated as V =. seismic energy, while the maximum vertical values occur equally in the S- and P-wave trains. D/N=Lis the number of moving grains per unit grain size and per unit river length (with units m 2), with N being the total number of sediment grains moving. 232 usc station #14 - channel 3 hmlvl. of Civil & Env. Exceptions: 1. It is intended that an engineer could read the list so as to review and verify adequate knowledge of seismic design and common errors, as well as on a per project basis when. the effect of vertical earthquake force on the initiation of the Daguangbao landslide, (a) static, (b) pseu-do-static, and (c) dynamic stability analysis, with or without considering the vertical seismic force, were performed using finite difference program FLAC3D, under the real seismic waves near the study site. The seismic vertical acceleration coefficient, k γ, should be assumed to be zero for the purpose of calculating lateral earth pressures, unless the wall is significantly affected by near fault effects, or if relatively high vertical accelerations are likely to be acting concurrently with the horizontal acceleration. The envelope of referred S2 level Required Response Spectra, for both the horizontal and the vertical. of Taft (Vertical) -Ground in Prototype Scale 3-34 3-22 Acceleration, Velocity and Displacement Histories and Response Spectrum ofEI Centro (Vertical) -Ground in Prototype Scale 3-35 3-23 Acceleration, Velocity and Displacement Histories and Response Spectrum of Pacoima Dam (Vertical) -Ground in Prototype Scale 3-36. Gregg Brandow Principal, Brandow and Nastar, Inc. Have a look what the experts say about the RS4D in this peer review. Eco-rubber seismic-isolation foundation systems: a cost-effective way to build resilience G. Facebook Twitter Google Email Seismic Design Maps & Tools Risk-Targeted Ground Motion Calculator Use the Tool Documentation & Help Earthquakes Hazards Data & Products Learn Monitoring Research Search Home About Us Contacts Legal. ) with 5% critical damping included. From this equation 1. The regression uses a two-step procedure that is a hybrid of the Joyner and Boore (1981) and Campbell (1981) regression methods. High-altitude view of the San Francisco Bay region showing surface traces of the Hayward and Calaveras faults. Anna University of Technology. The upward vertical acceleration will reduce the normal force which friction relies on. The ratio between vertical and horizontal rooftop accelerations and spectra is also discussed. In addition, the seismic loads due to vertical seismic excitation with a v = 0. The RS4D is the complete package. Seismic loads created in a structure are the result of the base-motion that can be prescribed for FAST simulations as one of acceleration, velocity, or displacement. factor decrease with an d increase in the seismic peak base acceleration. Record seismic wave with amplitude adjustment. com) (Director of Engineering Software Research Centre, Bandung, Indonesia) Summary In this paper we will study the effects of horizontal and vertical earthquake acceleration on the. For the case of upward vertical excitation,. Adrian Rodriguez-Marek and Balasingam Muhunthan 9. These all affect the way the seismic waves travel through the ground. The building is located in Shillong (seismic zone V). Obviously this would have a major impact on damage done by an earthquake at a given site. 5 V/g ± 5% Sensor natural frequency 25 Hz Flat bandwidth in acceleration: 2 to 200 Hz Dynamic range >105 dB at 36 dB gain. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. 2 are taken into account in the model. However, neither of the hexagrid configurations are as stiff as the diagrid system, resulting in larger seismic-induced lateral displacements and acceleration. (a) - Occupancy Category I, II, and III structures located on sites with mapped maximum considered earthquake spectral response acceleration at 1-second period, S1, equal to or greater than 0. Deterministic Seismic Hazard Analysis (DSHA) • Ground Motion Analyses: Basic Components • “Worst-Case” vs. These seismic forces are computed using uniform pseudo-static horizontal and vertical accelerations, ah=khg and av=kvg, where kh and kv are the horizontal and vertical seismic coefﬁcients, respectively. If you're behind a web filter, please make sure that the domains *. However, FEM and FDM methods have some disadvantage such as mesh distortion due to large deformation induced by soil failure. Model for Seismic Loading. 1 – Hydrodynamic pressure on tank wall due to vertical ground acceleration may be taken as () h y 1 h g A p v v − ρ = ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ × × = g S R I Z A a v 2 3 2 where y = vertical distance of point under consideration from bottom of tank wall, and g S a = Average response acceleration coefficient given by Figure 2. Effective Seismic Weight. j in a design; however, if the acceleration can be reduced, the lateral forces will be reduced. 1 Introduction D2. Adrian Rodriguez-Marek and Balasingam Muhunthan 9. From the results of the seismic hazard study, the design elastic acceleration spectrum was determined for structures with periods up to seven seconds. It is designed to withstand the vertical acceleration that is applied to the attachment. 30g for the AP1000 design. Obviously this would have a major impact on damage done by an earthquake at a given site. The peak ground acceleration of the safe shutdown earthquake, now referred to as the Certified Seismic Design Response Spectra (CSDRS), has been established as 0. Stratford Dept. The foregoing values were found with the seismic analysis using the commercial program ANSYS APDL [12]. The value of this acceleration is the principal input to consider in the FEA analysis. 005 s at 200 m. Again they have considered effect of horizontal seismic acceleration due to vertically propagating shear waves. ), no research efforts or experimental program to date has focused specifically on collectors. There are three main types of seismic waves in the earth: P (fastest), S (slower), and Surface waves (slowest). 2 of the systems weight is turned into a uni- form load and applied in that particular direction. 450 4500 400 550550650700500 3 0 0 @8 × 19 × 13 ×4 × 19 × 13 ×8 × 16 Horizontal accelerometer (2G) Vertical accelerometer (2G) Horizontal acceleration in the back (2G) Vertical acceleration in the back (2G). Andrianopoulos 3 Abstract Following an overview of pertinent literature, this paper presents a new methodology for estimating seismic coefficients for the. • UX,i (F TX,i = 1 ) is the displacement at storey i in direction X due to a unit force, F TX , applied at the centre of stiffness. EXAMPLE CALCULATION – Seismic Actions to BC3: 2013 Page 8 of 22 • Rz,i (MT,i = 1 ) is the rotation of the storey i about the vertical axis due to a unit moment, MT, applied at the centre of stiffness. 0 seconds (equivalent to frequencies of 5, 2, 1, and 0. U g is the peak ground seismic input acceleration. IBC seismic design categories D, E, and F call for 2in. _____ Supervisor, Dr. 30g as discussed in Section 2. CODE OF FEDERAL REGULATIONS 24 Parts 200 to 499 Revised as of April 1, 2000 Housing and Urban Development Containing a Codification of documents of general applicability and future effect As of April 1, 2000 With Ancillaries. Seismic Design of Deep Foundations Introduction Observations from recent earthquakes have shown that pile foundations are susceptible to significant damage when subjected to loads induced by large seismic events. Jaiswal,a… Durgesh C. H = the vertical height of the top point of attachment of the pipe drop to the freestanding structure. Today, the products continue to be produced in Lancaster, CA. 3 Vertical Seismic Design Force D2. Andrianopoulos 3 Abstract Following an overview of pertinent literature, this paper presents a new methodology for estimating seismic coefficients for the. 6g, where g is the acceleration due to gravity. Seismographs record a zig-zag trace that shows the changing amplitude of ground oscillations beneath the instrument. WikiEngineer has Equations, Examples, and information on Engineering Fundamentals including Seismic Design (Equivalent Lateral Force) Spreadsheet (v1. en, a number of curves de-scribing the parameterized response versus the ground. Acceleration is measured as a percentage of the Earths gravity. In addition, the seismic loads due to vertical seismic excitation with a v = 0. 2), is greater than 1. Shannon, PE Design Engineering Manager Howden Buffalo Inc. Applicable for the design of structures that remain in the elastic range, seismic isolation systems, and calculation of seismic displacements. Analysis of the deviation of horizontal polarization and the vertical polarization angle as a function of event backazimuth are used to obtain information about: i) sensor misorientation, ii) seismic anisotropy, and iii) velocity heterogeneities. Table III-3-1 shows the maximum acceleration values of seismic ground motions in three components, i. 75 g in horizontal direction and 0. is the peak response acceleration of the structure by seismic load. Chapter 11 SEISMIC DESIGN CRITERIA 11. PGA (peak acceleration) is what is experienced by a particle on the ground, and SA is approximately what is experienced by a building, as modeled by a particle mass on a massless vertical rod having the same natural period of vibration as the building. seismic wave, which is recorded in second site, is chosen as ground acceleration time history. finesoftware. 30g for the AP1000 design. Friction forces due to the gravity loads shall not be considered to provide resistance to seismic forces. • UX,i (F TX,i = 1 ) is the displacement at storey i in direction X due to a unit force, F TX , applied at the centre of stiffness. Depending on the severity of the seism, the magnitude of the horizontal acceleration (a d) can vary considerably. Calculate the slope earthquake dynamic response characteristics under the horizontal and vertical seismic acceleration by the FLAC3D numerical analysis method. The critical acceleration coefficient K, versus the acceleration direction 0 is plotted in Fig. The allowable acceleration response gain was set at. and Elnashai A. so, considering a Zero Period Acceleration of also 0. 0 seconds (equivalent to frequencies of 5, 2, 1, and 0. Keywords: - Acceleration time history, Kobe earthquake, Pile Foundation, Response quantity Vertical acceleration. The maximum acceleration of the vertical excitation is defined as 2/3 of the respective maximum horizontal acceleration. Shannon, PE Design Engineering Manager Howden Buffalo Inc. Why is the vertical component of earthquake in buildings not considered while IS 1893-1984 given for retaining wall and bridges not for building? Generally the peak horizontal acceleration. Seismic testing is regularly utilized to determine the effects of movements or vibrations from a seismic event (earthquake). The vertical seismic acceleration coefficient always reduces the uplift capacity, whereas the horizontal seismic acceleration coefficient reduces the uplift capacity in most cases. The acceleration components are derived from a single. finesoftware. Velocity is the distance an object has moved in a particular direction within a specified time interval. When the pendulum reaches vertical it can't stop instantaneously. Obviously this would have a major impact on damage done by an earthquake at a given site. These two aspects are recognized by most. Geophones, unlike hydrophones, detect motion rather than pressure. The upward vertical acceleration will reduce the normal force which friction relies on. Acceleration loads are used to simulate the ground motion of a time-history acceleration record. System identification of soil behavior from vertical seismic arrays 729 vertical directions. Read "Soil slopes under combined horizontal and vertical seismic accelerations, Earthquake Engineering and Structural Dynamics" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. The diaphragms are rigid as defined in Section 12. Acceleration (cm/s/s) Acceleration time history for component-3 of the 500-Year event for counties identified by 0. Office; Parent Category. 75g, where g is the acceleration due to gravity, develop in the. It is designed to withstand the vertical acceleration that is applied to the attachment. A location having an acceleration coefficient rate of 0. In the first one we subtracted the simultaneously recorded ocean bottom pressure signal from the vertical seismic acceleration in time domain. 47 inches dorsal to,. (4) Earthquake Loads: In the 1997 UBC, the earthquake load (E) is a function of both the horizontal and vertical components of the ground motion. AN ALTERNATIVE PROCEDURE FOR SEISMIC ANALYSIS AND DESIGN OF TALL BUILDINGS LOCATED IN THE LOS ANGELES REGION 2017 Edition with 2018 Supplements A consensus document developed by the Council: Dr. "The vertical ground acceleration used in combination with the horizontal base shear should be 80% of the design horizontal ground acceleration. Papadimitriou 1, George D. Choudhury and Nimbalkar (2006) have incorporated the effect of vertical seismic acceleration due to vertically propagating primary waves through the backfill soil. Tasalloti & C. If you're seeing this message, it means we're having trouble loading external resources on our website. Ground shaking can vary over an area as a result of factors such as topography, bedrock type and the location and orientation of the fault rupture. In this figure mechanism of variation of inertia force under vertical acceleration and rocking under horizontal ground motion have been plotted. Washington State Transportation Center (TRAC). 6g, where g is the acceleration due to gravity. For the case of upward vertical excitation,. Figure 8 shows the resulting circumferential and axial stresses for a constant acceleration as well as for the acceleration profiles given in Figure 7. Acceleration power spectral densities of vertical seismic noise at the best seismic stations show a minimum near 3 mHz. Detached one- and two-family dwellings, assigned to SDC A, B or C, or located where the mapped short-period spectral response acceleration, Ss ≤ 0. 2 are taken into account in the model. of Civil and Natural Resources Engineering University of Canterbury, Christchurch, New Zealand. The seismic design conditions are as follows: (a) Natural frequency: 30Hz or higher (b) Anti-acceleration: 3G or higher in horizontal direction, 2G or higher in vertical direction Figure 1 shows the development process of the seis-mic-resistant switchboard. damage can be as shallow as 1 to 2m and requires resolution at a fraction of a meter. Seismic Parameters Design in accordance with ASCE 7-10 Chapter 13: Yes No Design Basis of Equipment or Components (F p/W p) = See attachment, “I. The RS4D is the complete package. In most building codes in seismic regions, this value forms the basis for calculating the forces that a structure must be designed to resist (seismic analysis). The magnitude of the horizontal seismic load is directly proportional to the weight of the silo. The seismic coefficient method is one of the static procedures for earthquake resistant design of structures. This is displacement, When the particle is displaced and moves, it then has velocity and can exert force that is proportional to the particle's acceleration.