Design Response Spectra and Site Coefficients for Various Seismic Site Classes of Guwahati, India, Based on Extensive Ground Response Analyses

2020 ◽  
Vol 38 (6) ◽  
pp. 6255-6280
Author(s):  
Abhishek Kumar ◽  
Haldar Suman
Keyword(s):  
Response Spectra ◽  
Ground Response ◽  
Site Coefficients ◽  
Site Classes

Study on the Comparison of Ground Response Analysis for Class І Site

2014 ◽  
Vol 919-921 ◽  
pp. 1031-1034
Author(s):  
Xiao Fei Li ◽  
Rui Sun
Keyword(s):  
Strong Motion ◽  
Response Spectra ◽  
Response Analysis ◽  
Acceleration Response ◽  
Seismic Response Analysis ◽  
Ground Response ◽  
Real Situation ◽  
Ground Response Analysis ◽  
Ground Acceleration ◽  
Maximum Shear Strain

In order to test the applicable of the two equivalent linear seismic response analysis procedures SHAKE2000 and LSSRLI-1 for class І site, 21 underground strong motion records were selected from 11 stations of KiK-net as input earthquake motions. By using these two programs to calculate the peak ground acceleration, soil maximum shear strain and acceleration response spectra. By comparing the results of the two procedures and the measured results to evaluate the proximity of these two methods and then judge which program is closer to the real situation. Studies have shown that in class І site, the results of SHAKE2000 and LSSRLI-1 differ little; but according to the measured records, there are some differences between the two programs results and the measured records. While no matter comparing from which side, SHAKE2000 is closer to the earthquake records.

Study on Differences in Floor Response Spectra due to the Seismic Input Approach

2016 ◽  
Author(s):  
Jana Sue Bochert ◽  
Henry Schau ◽  
Timo Schmitt
Keyword(s):  
Wave Propagation ◽  
Site Response ◽  
Response Spectra ◽  
Response Analysis ◽  
Ground Response ◽  
Soil Layers ◽  
Seismic Input ◽  
Floor Response Spectra ◽  
Propagation Analysis ◽  
Different Depths

In this paper the differences of floor response spectra (FRS) resulting from different ground response spectra are discussed. These spectra include the site effects which are quantified via site response analysis. This response is generated by wave propagation from the base rock through the overlying soil layers to the surface. The influences of the different layers and the corresponding dynamic soil properties are considered by using wave propagation analysis. The paper then discusses the results obtained from seismic input at different depths conditions. Similar results might be expected, because the depth of the input spectra is adjusted for each layer. However, in comparing the floor response spectra of these calculations, significant differences are observed and therefore interpreted. The paper is completed with the explanation of these significant differences and also with comparable floor response spectra.

scholarly journals Reliability on ProSHAKE 2.0 in the Assessment of One Dimensional Ground Response Analysis through Verification Example

2019 ◽  
Vol 8 (4S2) ◽  
pp. 56-59
Keyword(s):  
Maximum Amplitude ◽  
Response Spectra ◽  
Response Analysis ◽  
Ground Response ◽  
Ground Response Analysis ◽  
Peak Displacement ◽  
Earthquake Motion ◽  
Soil Deposits ◽  
Time Histories ◽  
Frequency Domain Approach

It is understood from the recent destructive earthquakes, topography, nature of the bedrock and geometry of the soil deposits are the prime factors that made modifications to the underlying earthquake motion. The influence of such confined soil states on the strong earthquake motion plays a significant task in accessing the uniqueness of ground action. In this paper, the response of the soil layers to the earthquake action of the bedrock directly under it is determined. The analysis is done through frequency domain approach. Pro-shake software 2.0 is used to arrive the reliability of the ground response study. A wide variety of output parameters such as time histories of acceleration, velocity, displacement, shear stress, shear strain, response spectra and maximum amplitude of various parameters with depth are plotted and the other scalar parameters such as peak acceleration, peak velocity, peak displacement, RMS acceleration, arias intensity, predominant period and bracketed duration was computed.

Estimates of Site-Dependent Response Spectra for Design (Methodology and Justification)

1994 ◽  
Vol 10 (4) ◽  
pp. 617-653 ◽  
Author(s):  
Roger D. Borcherdt
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Strong Motion ◽  
Response Spectra ◽  
Building Code ◽  
Ground Shaking ◽  
Geological Conditions ◽  
Site Classes ◽  
Code Provisions

Recent borehole-geotechnical data and strong-motion measurements constitute a new empirical basis to account for local geological conditions in earthquake-resistant design and site-dependent, building-code provisions. They provide new unambiguous definitions of site classes and rigorous empirical estimates of site-dependent amplification factors in terms of mean shear-wave velocity. A simple four-step methodology for estimating site-dependent response spectra is specified herein. Alternative techniques and commentary are presented for each step to facilitate application of the methodology for different purposes. Justification for the methodology is provided in terms of definitions for the new site classes and derivations of simple empirical equations for amplification as a function of mean shear-wave velocity and input ground-motion level. These new results provide a rigorous framework for improving estimates of site-dependent response spectra for design, site-dependent building-code provisions, and predictive maps of strong ground shaking for purposes of earthquake hazard mitigation.

Analyses of earthquake ground motions at Japanese sites

1970 ◽  
Vol 60 (6) ◽  
pp. 2057-2070
Author(s):  
F. W. Kiefer ◽  
H. Bolton Seed ◽  
I. M. Idriss
Keyword(s):  
Ground Motions ◽  
Ground Surface ◽  
Response Spectra ◽  
Soil Conditions ◽  
Mass Analysis ◽  
Lumped Mass ◽  
Ground Response ◽  
Maximum Acceleration ◽  
Soil Layers ◽  
Local Soil

Abstract Ground motions at several Japanese sites are evaluated using recently-developed techniques which involve assessing the base-rock motion at the site due to an earthquake, establishing the properties of the overlying soil layers, and computing the response at the ground surface using a lumped-mass-analysis procedure. The maximum acceleration and the form of the response spectra for ground motions recorded at the several sites agree reasonably well with the computed values. It is concluded that where the soil conditions can be reliably determined, the analytical procedures offer good promise as a means of considering the effects of local soil conditions in the prediction of ground response.

Time History Input Development for the Seismic Analysis of Piping Systems

1980 ◽  
Vol 102 (2) ◽  
pp. 212-218 ◽  
Author(s):  
C.-W. Lin
Keyword(s):  
Degrees Of Freedom ◽  
Seismic Analysis ◽  
Time History ◽  
Response Spectra ◽  
Nonlinear Time History Analysis ◽  
System Response ◽  
Ground Response ◽  
Piping Systems ◽  
Statistical Relationships ◽  
Nonlinear Time History

In a nonlinear time history analysis of piping systems, the system response is generally highly coupled for all dynamic degrees-of-freedom. Therefore, the seismic time history input components, which are usually synthesized from the Regulatory Guide 1.60 spectra, play an important role in the piping seismic analysis. The design ground response spectra recommended in Regulatory Guide 1.60 are identical for both horizontal directions. No specific requirements are given to define their statistical relationships. As a result, the two horizontal components could either be identical or with erroneous relationships which could adversely affect the analysis. In this paper, the results of a study conducted to establish statistical relationships on 22 earthquakes are reported. These earthquakes are those used in establishing the design ground response spectra specified in Regulatory Guide 1.60. The statistical properties studied include the autocorrelation functions, crosscorrelation functions, coherence functions, and acceleration motion distribution. A set of criteria is recommended for the generation of the synthesized time histories so that analysis of the piping systems can be realistically and correctly conducted.

scholarly journals Seismic Ground Response Prediction Based on Multilayer Perceptron

2021 ◽  
Vol 11 (5) ◽  
pp. 2088
Author(s):  
Jaewon Yoo ◽  
Seokgyeong Hong ◽  
Jaehun Ahn
Keyword(s):  
Multilayer Perceptron ◽  
Quantitative Methods ◽  
Response Spectra ◽  
Economic Damage ◽  
Response Analysis ◽  
Ground Response ◽  
Conventional Model ◽  
Ground Response Analysis ◽  
Seismic Ground Response ◽  
Mlp Model

Earthquake disasters can cause enormous social and economic damage, and therefore the sustainability of infrastructure requires the mitigation of earthquake consequences. In seismic design of infrastructures, it is essential to estimate the response of the site during earthquake. Geotechnical engineers have developed quantitative methods for analyzing the seismic ground response. This study proposes a multilayer perceptron (MLP) model to evaluate the seismic response of the surface based on the seismic motion at the bedrock (or 100 m level), and compares its performance with that of a conventional model. A total of 6 sites, with 100 earthquake events at each site, were selected from the Kiban Kyoshin Network (KiK-net) and used as datasets. The acceleration response spectra were calculated from the predicted and measured (baseline) acceleration histories and compared. The proposed MLP model predicted the magnitudes of response and the natural periods where the response amplifies closely with the measured ground motions (baseline). The MLP model outperformed the conventional model for seismic ground response analysis. However, the proposed model did not perform as well for earthquakes whose response spectra exceed 2g due to a deficiency in large earthquake measurements in the training datasets.

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