EARTHQUAKE RESISTANT DESIGN APPROACH TO MEET UNKNOWABLENESS OF SEISMIC GROUND MOTIONS

Most seismic codes specify empirical formulas to obtain the fundamental period of buildings. The equations specified in present IS codes, are according to the available data on the time period of buildings measured from their recorded accelerograms. Shear-wall dominant reinforced concrete buildings, constructed, using codes specification are commonly built in different countries, facing a substantial seismic risk, in spite of their high resistance against ground motions. Current seismic code provisions including the Uniform Building Code (International Conference of Building Officials, Whittier, CA, 1997) and the Indian Seismic Code (Criteria for earthquake resistant design of buildings, fifth revision, 2002) are considered to evaluate the effect of time period on seismic behavior of building.In this study, time period obtained by code formulas are compared with those obtained by modal analysis in SAP2000. Also the top story displacement (as an adequate parameter of determination the seismic performance of building) correspond to the values of mentioned time period are estimated using uniform building code and software respectively. It is observed that current empirical equation for calculating the time period of RCC buildings is rather inaccurate. Also it is shown that the time period has very effective influence on seismic performance of building.

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Preliminary Amplification Studies of Some Sites using Different Earthquake Motions

Civil Engineering Journal ◽

10.28991/cej-2020-03091591 ◽

2020 ◽

Vol 6 (10) ◽

pp. 1906-1921

Author(s):

Manish Bhutani ◽

Sanjeev Naval

Keyword(s):

Ground Motions ◽

Ground Surface ◽

Earthquake Hazard ◽

Response Analysis ◽

Seismic Zone ◽

Ground Response ◽

Ground Response Analysis ◽

Ground Acceleration ◽

Earthquake Resistant Design ◽

Earthquake Resistant

Stability of infrastructure during earthquakes demands ground response analysis to be carried out for a particular region as the ground surface may suffer from amplified Peak Ground Acceleration (PGA) as compared to bedrock PGA causing instability. Many studies have been carried out the world over using different techniques but very few studies have been carried out for the northern part of India, Punjab situated at latitude of 31.326° N and longitude of 75.576° E, which is highly seismic and lies in seismic zone IV as per IS:1893-2016. In this paper 1-D equivalent non-linear ground response analysis has been conducted for sixteen sites of Jalandhar region, Punjab (India) by using five earthquake motions. Input ground motions are selected from the worldwide-recorded database based on the seismicity of the region. Based on the average SPT-N values, all the sites have been classified as per the guidelines of National Earthquake Hazard Reduction program (NEHRP). Shear modulus (G) was calculated using correlation between G and SPT–N Value. The ground surface PGA varies from 0.128 to 0.292 g for the sites of Jalandhar region with Amplification Factor values varying from 1.08 to 2.01. Hence the present study will be useful to the structural designers as an input towards suitable earthquake resistant design of structures for similar sites.

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Evaluation of Damage Potential of Ground Motions during Great Earthquakes

Earthquake Spectra ◽

10.1193/1.1597876 ◽

2003 ◽

Vol 19 (3) ◽

pp. 713-730 ◽

Cited By ~ 5

Author(s):

Y. Sunasaka ◽

K. Toki ◽

A. S. Kiremidjian

Keyword(s):

Ground Motions ◽

Damage Index ◽

Geological Structure ◽

Large Area ◽

Damage Potential ◽

Seismic Safety ◽

Great Earthquakes ◽

Earthquake Resistant Design ◽

Earthquake Resistant ◽

Index Value

In order to select appropriate input ground motions for earthquake-resistant design or estimation of seismic safety of structures, their characteristics should be identified. In this paper, damage potential is defined as a spectrum of strength demand required to maintain a damage index less than or equal to a tolerable damage index value. The damage index proposed by Park and Ang (1985) and a bilinear model are used to calculate the strength demand spectrum. The damage index describes the state of the concrete structure from slight damage to severe damage or collapse. Studies of the damage potential of ground motions during the recent great earthquakes, including the 1995 Hyogoken-Nanbu earthquake in Japan and the 1999 Chi-Chi earthquake in Taiwan, show that damage potential may be greatly affected by the location of the fault, the geological structure of the site, and the fault rupture mechanism. Furthermore, an estimation of damage potential of ground motions over a large area, Kawasaki City in Japan, is described.

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A review of information on seismic hazards needed for the earthquake-resistant design of lifeline systems in the United States

Open-File Report ◽

10.3133/ofr88362 ◽

1987 ◽

Author(s):

W.W. Hays

Keyword(s):

United States ◽

The United States ◽

Seismic Hazards ◽

Earthquake Resistant Design ◽

Earthquake Resistant ◽

Lifeline Systems

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FUNDAMENTAL STUDY ON EARTHQUAKE RESISTANT DESIGN OF FILL-TYPE DAMS

Proceedings of the Japan Society of Civil Engineers ◽

10.2208/jscej1969.1983.339_127 ◽

1983 ◽

Vol 1983 (339) ◽

pp. 127-136 ◽

Cited By ~ 1

Author(s):

Yoshio OHNE ◽

Hidehiro TATEBE ◽

Kunitomo NARITA ◽

Tetsuo OKUMURA

Keyword(s):

Fundamental Study ◽

Earthquake Resistant Design ◽

Earthquake Resistant

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A NEURAL NETWORK-WAVELET MODEL FOR GENERATING ARTIFICIAL ACCELEROGRAMS

International Journal of Wavelets Multiresolution and Information Processing ◽

10.1142/s0219691304000524 ◽

2004 ◽

Vol 02 (03) ◽

pp. 217-235 ◽

Cited By ~ 16

Author(s):

GENE F. SIRCA ◽

HOJJAT ADELI

Keyword(s):

Neural Network ◽

Geographic Location ◽

Training Data ◽

Wavelet Network ◽

Design Spectrum ◽

Earthquake Resistant Design ◽

Earthquake Resistant ◽

Structural Configurations ◽

Earthquake Accelerograms ◽

Artificial Accelerograms

In earthquake-resistant design of structures, for certain structural configurations and conditions, it is necessary to use accelerograms for dynamic analysis. Accelerograms are also needed to simulate the effects of earthquakes on a building structure in the laboratory. A new method of generating artificial earthquake accelerograms is presented through adroit integration of neural networks and wavelets. A counterpropagation (CPN) neural network model is developed for generating artificial accelerograms from any given design spectrum such as the International Building Code (IBC) design spectrum. Using the IBC design spectrum as network input means an accelerogram may be generated for any geographic location regardless of whether earthquake records exist for that particular location or not. In order to improve the efficiency of the model, the CPN network is modified with the addition of the wavelet transform as a data compression tool to create a new CPN-wavelet network. The proposed CPN-wavelet model is trained using 20 sets of accelerograms and tested with additional five sets of accelerograms available from the U.S. Geological Survey. Given the limited set of training data, the result is quite remarkable.

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