Vertical Seismic Acceleration

30g as discussed in Section 2. considers the seismic characteristics of the site. A screen-cap of that example is inserted below. Gazetas Abstract This paper explores the sensitivity of 2D wave effects to crucial problem. Effective Footing Area (Aftg). 2 g load in a particular direction, then a factor of 0. As a consequence, high vertical seismic. Where θ = tan-1 K h, α = wall slope to horizontal (90 degrees for a vertical face), ϕ = angle of internal friction, β = backfill slope, and δ = wall friction angle. Seismogram—real-time record, made of metal tape, of seismic waves. Acceleration power spectral densities of vertical seismic noise at the best seismic stations show a minimum near 3 mHz. The acceleration components are derived from a single. (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. Again they have considered effect of horizontal seismic acceleration due to vertically propagating shear waves. tal seismic force and disregard the vertical acceleration, although a real earthquake will subject the sliding mass to both. Seismic Analysis Introduction In seismic design we take a dynamic force and analyze it as a temporary static load. According to the IBC standard, when i start to calculate the Sds; Sds = 2/3 * Sms Sms = Fa * Ss; Fa = 1. 79 g Cross‐canyon 2. Carvalho, M. 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. The seismic force, E, appears in load combinations. Chapter 11 SEISMIC DESIGN CRITERIA 11. Engineering, Univ. • IS 1893-2002 is used to carryout the seismic analysis of multi-storey building. 2 on gravity loads effectively represents a vertical acceleration of about 0. A location having an acceleration coefficient rate of 0. 0, and 10% of critical damping where the maximum vertical ground acceleration is 0. Among them, an anomalously large peak acceleration of 3. The term E used in combinations is composed of vertical and horizontal components. Vertical acceleration causes a reduction in response acceleration and response displacement. 0 E + L * + 0. txt) or view presentation slides online. ; Seidensticker, R. This paper presents an assessment of reactor core vertical accelerations for large-diameter LMR reactors under various core-support conditions. In all calculations of earthquakes affecting bushings apply the vertical acceleration downwards, in the same direction as the acceleration due to gravity. EFFECT OF USING PERFORMANCE-BASED APPROACH FOR SEISMIC DESIGN OF TALL BUILDING DIAPHRAGMS Naveed Anwar 1, Jose A. S s is a coefficient used to calculate the effect of the Maximum considered earthquake ground motion for the given geographical location. A vertical seismic isolation structure is capable of achieving vertical seismic isolation of nuclear reactor components connected to each other by primary pipings, while suppressing the relative. They have 50 for $25 ea. Effort is made to show how significant the effect could be on the factor of safety against sliding. 2, in the step describing the use of final design spectrum accelerations and participation factors as inputs for calculating the responses for selected modes, the axis directions have been italicized as. consequence is a reduction of the acceleration responce of the building. 1(1) through 1613. (2008) reported that the vertical seismic acceleration was twice the horizontal seismic acceleration during the Iwate-Miyagi earthquake in Japan. - (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. System identification of soil behavior from vertical seismic arrays 729 vertical directions. Seismic enhancements made to the test units and modifications required (Design spectral response acceleration at 1 second period, g) = Vertical C. The scenario developed characterizes the behavior of a bridge with a short fundamental period of vibration in a moderate seismic zone, where vertical ground motion effects may be applicable yet not considered by structural code. considers the seismic characteristics of the site. " Proceedings of the 2018 26th International Conference on Nuclear Engineering. vertical ground acceleration on the seismic response has not been exhaustively studied. Z = Seismic zone factor as per Table 2 of IS 1893 (Part 1): 2002 ρ = Mass density of liquid ρ. Example of Vertical Reaction Loads at the Main Gravity Supports when the Tokamak is Subject to a Horizontal Seismic Acceleration H L Ma Fv R The response of the tokamak system when loaded by a vertical seismic excitation is fairly easy to consider as a repetitive increase/reduction of the normal gravity load. (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. a) can be determined from the table below:. Geometry is limited to infinite or broken-backslope, and constant horizontal foreslope angle. theaudiopedia. – DSAP seismic evaluation completed in 1989. The Seismic Intensity Scale may change after the calculation according to the earthquake duration and vibration. The update of PSHA motions determined that PC-3 design response spectra now has a peak horizontal ground acceleration of 0. System identification. In order to study the characteristics of vertical and horizontal seismic oscillation acceleration acted on the slope. However, they recommended checking the vertical displacement to avoid any damage to the springs. Seismic Source Type <= 2 km 5 km >= 10 km A 1. Friction forces due to the gravity loads shall not be considered to provide resistance to seismic forces. Using the provided base-motion, the other two time histories are numerically calculated so a consistent set of acceleration,. 15g, or equivalently 15% of g. Seismic Code Requirements John W. The factor 1. It is designed to withstand the vertical acceleration that is applied to the attachment. Studies for acceptance, a thesis entitled "Seismic sensing: Comparing geophones and accelerometers using laboratory and field data" submitted by Michael S. 1 GENERAL 11. Several velocity analysis methods have been used in the past but today most velocities are picked interactively using combination displays on processing workstations. The Seismic Demand can be a. In all calculations of earthquakes affecting bushings apply the vertical acceleration downwards, in the same direction as the acceleration due to gravity. (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. A screen-cap of that example is inserted below. The RS4D is the complete package. To consider the vertical seismic effect, the uniform vertical acceleration distribution is added to the soil-underground structure system as vertical body force distribution, as shown in Figure 2. Expected ground motion can be calculated on the basis of probability, and the expected ground motions are referred to as seismic hazard. a) can be determined from the table below:. 5 Ge effective specific gravity including vertical seismic effects = G(1-0. Based on Modeling analysis was carried out using ETAB, with various Zones of earthquake, it is observed that cantilever projections are deforming due to vertical ground acceleration, also results show that deflections are more for. 4Av) 6 H Maximum design product level, m (ft) 7 HS Thickness of soil, m (ft). Drawings and general provisions of the Contract, including General and Supplementary. that the vertical ground motion contributes significantly to the dynamic instability of conical elevated tanks and should therefore be considered for seismic design of such structures. KINETICS™ Guide to Understanding IBC Seismic for MEP 2. The influence of the vertical component of ground motion is often introduced by the ratio ( is the peak vertical acceleration and is the peak. when the vertical frequency of the isolation system was 1. • IS 1893-2002 is used to carryout the seismic analysis of multi-storey building. Keywords: - Acceleration time history, Kobe earthquake, Pile Foundation, Response quantity Vertical acceleration. 1) Shear Factor : Shear Factor λ, Minimum seismic shear factor of the floor (default as calculated from Table 5. Four seismic elevator categories depending on this acceleration value are given in EN 81-77. equilibrium by several computational methods. Typically, the vertical component of the ground motion is not considered explicitly in seismic design of bridges, but in some cases the vertical component can have a significant effect on the structural response. The Richter Scale measures. f,D/ D ID m Z t c 0 a. Friction forces due to the gravity loads shall not be considered to provide resistance to seismic forces. The seismic-induced vertical acceleration was ignored and the yield acceleration, a y, at which sliding takes place along the base of the wall was estimated as P AE sin (δ + β) tang φ b - P AE cos (δ + β). horizontal and vertical seismic acceleration, for increasing levels of seismic intensity. Chapter 11 SEISMIC DESIGN CRITERIA 11. Washington State Transportation Center (TRAC). It is designed to withstand the vertical acceleration that is applied to the attachment. Resonance search tests, between 1 and 50 Hz, with an acceleration level of. It is shown that seismic force has a significant effect on stability and permanent displacement of slopes. 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 Qualitative Analysis of Vertical Seismic Acceleration Effect on a Single Nuclear-Coupled Boiling Channel Natural Circulation Loop. The acceleration outputs on the horizontal axes are the 1G vector multiplied by the sine of the angle between the vertical component of the horizontal axes of the sensor and the external Cartesian axes referenced to the seafloor. For reference an acceleration of 1g is 9. Acceleration occurs anytime an object's speed increases or decreases, or it changes direction. 51 Then my Sds = 1. vertical, not horizontal, seismic acceleration; — in 6. 4 Special Design Requirements. The equivalent forces are taken as the mass of the body multiplied by coefficients of acceleration for both horizontal and vertical directions. of vertical seismic component. 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. VB A h W Where, Z I Sa Is the design horizontal seismic coefficient, 2 R g which depends on the seismic zone factor importance factor, response reduction factor and average response acceleration. 1) Shear Factor : Shear Factor λ, Minimum seismic shear factor of the floor (default as calculated from Table 5. system improved significantly the seismic performance of the equipment. This approach uses a single, monotonically-applied horizontal and/or vertical acceleration to represent earthquake loading. Based on these equations, a computer program was developed to study the. Therefore, the equivalent seismic coefficient should be just a percentage of the site-adjusted PGA. Live loads would not typically control the design of the foundation. Bandy and Mortera Gutierrez, 2012. 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. The downward force Mg is called the gravity load. In 1969, Richards and Elms presented a rational method for the selection of a suitable seismic coefficient, based upon the. seismic coefficients in current practice is largely empirical and sometimes inconsistent, leading to designs that may be either excessively conservative or unsafe. However, if you want to attempt 3d positioning, you will need a 3 axis accelerometer, or two 2 axis ones mounted at right angles. seismic shear and moment loads in a seismic event. Table 1 below shows horizontal seismic coefficient. 80, which is the maximum in the United States. by a constant equivalent-static acceleration, which produces horizontal and vertical inertial forces acting on the centroid of the sliding mass. The maximum horizontal and vertical ground acceleration for OBE is 0. Based on Modeling analysis was carried out using ETAB, with various Zones of earthquake, it is observed that cantilever projections are deforming due to vertical ground acceleration, also results show that deflections are more for. Expected ground motion can be calculated on the basis of probability, and the expected ground motions are referred to as seismic hazard. The seismic response analysis develops the probability distributions of the RE seismic demands on the plant structures, systems, and components (SSCs). "The Qualitative Analysis of Vertical Seismic Acceleration Effect on a Single Nuclear-Coupled Boiling Channel Natural Circulation Loop. A vertical seismic isolation structure is capable of achieving vertical seismic isolation of nuclear reactor components connected to each other by primary pipings, while suppressing the relative. Detects vertical “P” and horizontal “S” wave accelerations. 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]. I made the modal analysis and it gives 11 modes, which look correct. 0 E + L * + 0. 25 for Zone 1, 0. 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. Seismic Design Category All building shall be classified to seismic design category based on their occupancy category (I) and the design spectral response acceleration coefficients, S DS and S D1. Technical References. Depending on the compiler, measuring analog acceleration can be as simple as acceleration=read_adc(); and can be done in a few microseconds. A cartoon of the scope of the sy stem is shown in Fig. The Seismic Intensity Scale may change after the calculation according to the earthquake duration and vibration. The regression uses a two-step procedure that is a hybrid of the Joyner and Boore (1981) and Campbell (1981) regression methods. The seismic response coefficient, C s, is based on Equation 12. 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. 3 How the earthquake affects the bushing. To overcome and prevent these undesirable problems, structural design optimization of a small vertical axis wind turbine has performed, in this study, for seismic qualification and lightweight by using a Genetic Algorithm (GA) subject to some design constraints such as the maximum stress limit, maximum deformation limit, and seismic acceleration gain limit. Each MDE included three directional components (upstream / downstream, cross valley and vertical). Seismic enhancements made to the test units and modifications required (Design spectral response acceleration at 1 second period, g) = Vertical C. considers the seismic characteristics of the site. (1) Here, , and denote mass-, damping- and stiffness-coefficient ma- trices of order n, respectively. [3] the effect of vertical seismic component. 18 Uniaxial Test: A dynamic test center of massin which the test specimen is subjected to acceleration in one principal axis. Updated Near-Source Ground-Motion (Attenuation) Relations for the Horizontal and Vertical Components of Peak Ground Acceleration and Acceleration Response Spectra. Seismic wave— A vibrational disturbance in the Earth that travels at speeds of several kilometers per second. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. 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. Vertical Seismic Load Effect on Building Response. A plot of the peak acceleration for the mixed vertical oscillators 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. The second primary earthquake hazard, ground shaking, is the result of rapid ground acceleration. The Richter Scale measures. = month, day, year Peak ground acceleration PGA [cm/s2] Peak ground velocity PGV [mm/s] Peak ground displacement PGD [µm] M. ; Seidensticker, R. The use of different types of velocity data and their application to gravity modelling. horizontal; 32,000 lbs. 2s (7% in 75-Year) Ground Motions; 1. The vertical component of ground acceleration is normally assumed to be zero during this representation. 2010-05-25 Rev 1. For our calculations, the vertical acceleration is assumed to be zero (Bathurst, 1998, NCMA Segmental Retaining Walls - Seismic Design Manual. Keywords: - Acceleration time history, Kobe earthquake, Pile Foundation, Response quantity Vertical acceleration. They have studied the effect of various parameters such as wall friction angle (δ) and soil friction angle (φ) on later-al earth pressures. Live loads would not typically control the design of the foundation. In earthquake prone areas, horizontal and vertical pseudostatic (seismic) coefficients, k h and k v, respectively, are used to compute the horizontal and vertical forces caused by a potential earthquake, as shown in Figure 1. On land the instruments are called seismometers or geophones. DHA is located 3 m from the 1/4 scale structure and DHB is located 47 m from the structure, allowing identification of the effects of the structure on soil response. they are designed for a force equal to the mass M (this includes mass due to own weight and imposed loads) times the acceleration due to gravity g acting in vertical downward direction (- Z). 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. 4 OVERVIEW For a given building site, the risk-targeted maximum considered earthquake spectral response accelerations S S, at short periods, and S 1, at a 1-second period, are given by the acceleration contour maps in Chapter 22 in Figures 22-1 through 22-6. 0 SCOPE AND APPLICATION This guideline is intended to be used as supplementary document to NBCC2005 for the seismic design of petrochemical. The computation of each static and dynamic pressure acting on retaining wall need more. For our calculations, the vertical acceleration is assumed to be zero (Bathurst, 1998, NCMA Segmental Retaining Walls - Seismic Design Manual. "Effects of Horizontal and Vertical Earthquake Accelerations to Rooftop Pool during Medium Earthquake" by Nathan Madutujuh ([email protected] Shannon, PE Design Engineering Manager Howden Buffalo Inc. δ n, Additional seismic action factor at the top of the building (default as calculated from Table 5. Seismic Dampers. The scenario developed characterizes the behavior of a bridge with a short fundamental period of vibration in a moderate seismic zone, where vertical ground motion effects may be applicable yet not considered by structural code. DHA is located 3 m from the 1/4 scale structure and DHB is located 47 m from the structure, allowing identification of the effects of the structure on soil response. 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. 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. Adequate and simple methods to consider the combined effects of the thee ground motion components for seismic design are proposed in this work. Seismic isolation systems are widely recognized as beneficial for protecting both acceleration- and displacement-sensitive nonstructural systems and components. 1 GENERAL 11. In the duration of an earthquake, a horizontal seismic force H is applied in every mass M that has gravity load W. The RS4D is the complete package. 51 Then my Sds = 1. © 1997 John Wiley & Sons Ltd. the horizontal acceleration (in g), and G é is the vertical acceleration (in g). displacement and base shear of the isolated structure. independent tri-axial shaker table with 8,000 lb. Detached one- and two-family dwellings, assigned to Seismic Design Category A, B or C, or located where the mapped short-period spectral response acceleration, SS, is less than 0. These coefficients are termed as seismic acceleration coefficients, Kh and Kv, for horizontal and vertical direction respectively. High-altitude view of the San Francisco Bay region showing surface traces of the Hayward and Calaveras faults. Thus the peak acceleration in this region was about 150/980 g, or about 0. 75g, where g is the acceleration due to gravity, develop in the. free air and inertial effects exerted by atmospheric phenomena on the sensor mass. 23), which thus reduces to. Vertical acceleration is neglected, resulting in a more conservative K AE. – Peak ground acceleration (PGA) for the horizontal direction defined as 0. ) In this case, FN I,2. Context Seismic isolation systems developed and implemented for power transformers, so far, only provide protection against the horizontal components of earthquake motion. Hons in partial fulfillment of the requirements for the degree of Master of Science. 8 -1) where, C s is the seismic response coefficient, and W is the effective seismic weight. Base isolation has been widely used to reduce the risk caused by horizontal ground motion during an earthquake. Some of the directiondependent data is common to all of the codes. 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. DHA is located 3 m from the 1/4 scale structure and DHB is located 47 m from the structure, allowing identification of the effects of the structure on soil response. seismic network exists. STATIC AND SEISMIC PRESSURES FOR DESIGN OF RETAINING WALLS By Guoxi Wu, Ph. The dynamic analysis was conducted using the 0. And in most of the cases the vertical component of an ground shaking will be in the range of 1/3 rd to 2/3 rd of the peak horizontal component. An assessment of LMR reactor core vertical acceleration under seismic events Conference Ma, D. In structures assigned to Seismic Design Category C, D, E or F, ballasted nonpenetrating systems shall be designed to accommodate seismic displacement determined by nonlinear response-history analysis or shake-table testing, using input motions consistent with ASCE 7 lateral and vertical seismic forces for nonstructural components on roofs. 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. I attached a picture about the resulted reactions for the 4 supports in case of 1*X+. The factor 1. (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 peak horizontal acceleration (PHA) is the most commonly used type of ground acceleration in engineering applications. Sweeney, Matthew A. Seismic Dampers. What are the kinematic formulas? Here are the main equations you can use to analyze situations with constant acceleration. Seismic design shall include both effective from horizontal seismic and vertical seismic force. 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. The maximum analytical or test acceleration at which the Equipment can satisfy the performance criteria as defined in Section 5. 5 – BUILDING CONCRETE AND STRUCTURAL STEEL SECTION 014100 - NON-STRUCTURAL SEISMIC DESIGN CRITERIA PART 1 - GENERAL 1. The seismic acceleration response shows a steady amplification with the increase of height without water in substratum, and the maximal seismic response occurs near the crest of slope. 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. It is the side-to-side movement that causes the most damage. ASCE 41 means the Seismic Evaluation and Retrofit of Existing Buildings ASCE/SEI 41-13 published by the American Society of Civil Engineers and the Structural Engineering Institute. This produces the greatest load on the bushing. SEISMIC ACTIONS 4. Crawford and Spahr C. This resource page provides an introduction to the concepts and principles of seismic design, including strategies for designing earthquake-resistant buildings to ensure the health, safety, and security of building occupants and assets. Crawford and Spahr C. 4] Horizontal Effective Peak Ground Accelerations are defined for Severe EQ (see 2. Off the top of my head the equation for the vertical seismic component is something like 0. The vertical ground motion component is disregarded in the design of ordinary highway bridges in California, except for the bridges located in high seismic zones (sites with design horizontal peak ground acceleration greater than 0. Velocity can be determined from laboratory measurements, acoustic logs, vertical seismic profiles or from velocity analysis of seismic data. For structures with a fundamental period less than or equal to 0. 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). In this study, it is presented equations for estimating peak vertical acceleration and vertical absolute acceleration response spectra in terms of magnitude, source-distance, site conditions and other parameters for shallow earthquakes in the seismically active parts of the World. 2S DS (representing E v) directly into the load combinations. 25 for Zone 1, 0. a) can be determined from the table below:. The foregoing values were found with the seismic analysis. The building is located in Shillong (seismic zone V). 5 of Eurocode 8 Part 1 provides rules for constructing a "design spectrum", from. they are designed for a force equal to the mass M (this includes mass due to own weight and imposed loads) times the acceleration due to gravity g acting in vertical downward direction (- Z). Webb Abstract Low-frequency (! 0. The 1997 UBC seismic design provisions are based on strength-level design rather than service-level design. Seismic design of retaining wall is considerably complicated problem in which assumptions have to be considered in order to make indeterminable issue solvable employing theory of statics and differential calculus. Vertical Structural Irregularities. H 18-8 – SEISMIC DESIGN REQUIREMENTS October 1, 2016. Vertical Seismic Load Effect on Hysteric Columns. The seismic acceleration response shows a steady amplification with the increase of height without water in substratum, and the maximal seismic response occurs near the crest of slope. Projectile Motion for Vertical Displacement Calculation I want to calculate Vertical Displacement at Time(Δy) Initial Vertical Velocity(Vy0) Acceleration of Gravity(g) Time(t) Initial Vertical Velocity(V y0 ) m/s. All structures are primarily designed to carry the gravity loads, i. (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. These all affect the way the seismic waves travel through the ground. Evaluation of Effective Seismic Weight, W – see Appendix 2. We verified the seismic isolation's performance from the experimental result because the average reduction rate of the acceleration was 0. 4Av) 6 H Maximum design product level, m (ft) 7 HS Thickness of soil, m (ft). Table 1 below shows horizontal seismic coefficient. The resonant vertical vibration of bridges has appeared recently that alarmed the civil engineers and initiated the papers [7,8]. Seismic instruments are used to measure low-frequency ground motion caused by earthquakes. - (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. Seismic coefficient method. Among them, an anomalously large peak acceleration of 3. 33 g Photographs compliments of Norihisa Matsumoto and Gabriela Lyvers Seismic Analysis of Concrete Dams Workshop 2017 USSD Annual Conference April 6-7, 2017. S s is a coefficient used to calculate the effect of the Maximum considered earthquake ground motion for the given geographical location. A methodology to investigate the effect of vertical seismic acceleration on the qualitative dynamic behaviors of a natural circulation loop with parallel nuclear-coupled boiling channels Research output : Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › Not applicable › peer-review. Keywords: - Acceleration time history, Kobe earthquake, Pile Foundation, Response quantity Vertical acceleration. Figure 7 shows the vertical displacement of the edge of the liquid free surface (point A of Figure 3). 5% damping = 1. Example of Vertical Reaction Loads at the Main Gravity Supports when the Tokamak is Subject to a Horizontal Seismic Acceleration H L Ma Fv R The response of the tokamak system when loaded by a vertical seismic excitation is fairly easy to consider as a repetitive increase/reduction of the normal gravity load. 3 Example 1 Earthquake Load Combinations: Strength Design For the specifi c values of ρ = 1. – DSAP seismic evaluation completed in 1989. by a constant equivalent-static acceleration, which produces horizontal and vertical inertial forces acting on the centroid of the sliding mass. vertical seismic component, changes in the friction coefficient should be duly considered. The computation of each static and dynamic pressure acting on retaining wall need more. 5G, which are sufficientlyhigher than the design seismic force. w = Mass density of tank wall φ = Circumferential angle as described in Fig. horizontal; 32,000 lbs. Iemura et al. p = horizontal force factor that ranges from 0. seismic demands on the development of performance limit states in this type of construction. Average acceleration is determined over a "long" time interval. Accelerograph - A strong motion earthquake. The vertical ground motion component is disregarded in the design of ordinary highway bridges in California, except for the bridges located in high seismic zones (sites with design horizontal peak ground acceleration greater than 0. 4Av) 6 H Maximum design product level, m (ft) 7 HS Thickness of soil, m (ft). 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. Resonance search tests, between 1 and 50 Hz, with an acceleration level of. A vertical load term is calculated (page 119, 1. Shear Force (V)—Force generated at the plane of the seismic restraints; acting to cut the restraint at the base. Changes to the seismic hazard maps are presented, along with explanations as to why they were necessary and how they will affect seismic design. Review of Indian seismic code, IS 1893 (Part 1) : 2002 The Indian seismic code IS 1893 has now been split into a number of parts and the first part containing general provisions and those pertaining to buildings has been released in 2002. The use of different types of velocity data and their application to gravity modelling. Horizontal and Vertical Shaking. Carvalho, M. Stewart, Department of. Chapter 11 SEISMIC DESIGN CRITERIA 11. vertical RRS of the EDF MRI standard for large equipment. horizontal (longitudinal and transversal) and vertical. Seismic risk is routinely expressed as the probability that a certain value of seismic intensity, earthquake magnitude or a specific ground motion parameter such as peak ground acceleration, velocity or displacement will not be exceeded at a specific location within a specific interval of. A screen-cap of that example is inserted below. 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. The first step in static seismic analysis is to collect the seismic coefficient. The seismic response coefficient, C s, is based on Equation 12. Assuming you mean energy in a moving object then that is the kinetic enrgy which is related to velocity. 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). vertical RRS of the EDF MRI standard for large equipment. Seismic Design Category A structures need only comply with Section 1616. SEISMIC DESIGN OF RETAINING WALLS CONSIDERING VERTICAL GROUND ACCELERATION J. Zangar proposed that the horizontal force P Z,Z above arbitrary depth, Z, is calculated as: P Z,Z (Z) 0. In addition, the seismic loads due to vertical seismic excitation with a v = 0. finesoftware. 18 Uniaxial Test: A dynamic test center of massin which the test specimen is subjected to acceleration in one principal axis. K AE = active earth pressure coefficient, static+seismic Where θ = tan -1 K h , α = wall slope to horizontal (90 degrees for a vertical face), ϕ = angle of internal friction, β = backfill slope, and δ = wall friction angle. After I made a seismic analysis according to IBC 2012. Instructional Material Complementing FEMA 451, Design Examples Seismic Load Analysis 9 - 17 1a, 1b) Stiffness (Soft Story) Irregularity Vertical Structural Irregularities Irregularity (1a) exists if stiffness of any story is less than 70% of the stiffness of the story above or less than 80% of the average stiffness of the three stories above. " Proceedings of the 2018 26th International Conference on Nuclear Engineering. The footings for the permanent foundation must be sized to prevent sinking or settlement of the manufactured home. 1, is less than or equal to 0. Detached one- and two-family dwellings, assigned to Seismic Design Category A, B or C, or located where the mapped short-period spectral response acceleration, SS, is less than 0. Seismic enhancements made to the test units and modifications required (Design spectral response acceleration at 1 second period, g) = Vertical C. U is the peak response acceleration of the structure by seismic load. Pseudo-static analysis is widely used for seismic stability assessment of earth embankments and slopes [1, 6, 7, 8, and 9]. 27 g Crest Acceleration Upstream 1. For the case of upward vertical excitation,. – DSAP seismic evaluation completed in 1989. The zero-stress boundary condition can be easily verified, following a similar procedure as presented by the discusser. 2 Page 2 of 74 1. 15g acting on a retaining wall for a time period of T seconds. What are the kinematic formulas? Here are the main equations you can use to analyze situations with constant acceleration. Our dampers resist dynamic motion and remove energy from a structure during wind or seismic events, allowing it to withstand harsh input energy and reduce harmful deflections, forces and accelerations to structures and occupants. In the present paper, the seismic design and analysis is conducted for two specific case stu-dies, namely a horizontal-cylindrical and a vertical-cylindrical pressure vessel, which consti-. Stewart, Department of. Seismic Source Type <= 2 km 5 km >= 10 km A 1. to consider vertical seismic action.