Seismic Evaluation of Multi-Storey RC Frame Using Modal Pushover Analysis |
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Authors: | S Chandrasekaran Anubhab Roy |
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Institution: | (1) Department of Civil Engineering, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India |
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Abstract: | The recently developed pushover analysis procedure has led a new dimension to performance-based design in structural engineering
practices. With the increase in the magnitude of monotonic loading, weak links and failure modes in the multi-storey RC frames
are usually formed. The force distribution and storey displacements are evaluated using static pushover analysis based on
the assumption that the response is controlled by fundamental mode and no mode shift takes place. Himalayan-Nagalushai region,
Indo-Gangetic plain, Western India, Kutch and Kathiawar regions are geologically unstable parts of India and some devastating
earthquakes of remarkable intensity have occurred here. In view of the intensive construction activity in India, where even
a medium intensity tremor can cause a calamity, the authors feel that a completely up-to-date, versatile method of aseismic
analysis and design of structures are essential. A detailed dynamic analysis of a 10-storey RC frame building is therefore
performed using response spectrum method based on Indian Standard Codal Provisions and base shear, storey shear and storey
drifts are computed. A modal pushover analysis (MPA) is also carried out to determine the structural response of the same
model for the same acceleration spectra used in the earlier case. The major focus of study is to bring out the superiority
of pushover analysis method over the conventional dynamic analysis method recommended by the code. The results obtained from
the numerical studies show that the response spectrum method underestimates the response of the model in comparison with modal
pushover analysis. It is also seen that modal participation of higher modes contributes to better results of the response
distribution along the height of the building. Also pushover curves are plotted to illustrate the displacement as a function
of base shear. |
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Keywords: | dynamic analysis higher mode contribution modal pushover analysis pushover curves response spectrum analysis (RSA) |
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