Title: Displacement response spectra for active seismic regions in India

Authors: K.P. Sreejaya; S.T.G. Raghukanth; D. Srinagesh; C.V.R. Murty

Addresses: Indian Institute of Technology, Madras, India ' Indian Institute of Technology, Madras, India ' CSIR National Geophysical Research Institute (NGRI), Hyderabad, India; Indian Institute of Technology, Madras, India ' Indian Institute of Technology, Madras, India

Abstract: As damage is better correlated to displacements than forces during an earthquake, displacement response spectrum (DRS) is critical for important structures. However, there are no past attempts to develop attenuation relations or response spectra for displacement spectral ordinates. Hence, in this study, probabilistic seismic hazard analysis (PSHA) has been carried out based on gridded seismicity approach to arrive at 5%-damped uniform hazard DRS (0.01 s-10 s) for the region (24°N-40°N, 65°E-100°E) for both rock and soil site conditions. The spectral displacement obtained at 10 s natural period is as high as 140 cm-145 cm for rock and 200 cm-210 cm for soil sites in the region. Moreover, a simplified bilinear approximation of the displacement spectra is presented along with the map of corner periods. These results can be used by engineers for displacement-based seismic design in the region, especially of critical and lifeline structures.

Keywords: probabilistic seismic hazard; displacement response spectra; long-period structures; bilinear approximation; corner period.

DOI: 10.1504/IJEIE.2022.122834

International Journal of Earthquake and Impact Engineering, 2022 Vol.4 No.1, pp.48 - 82

Received: 12 Oct 2020
Accepted: 23 Mar 2021
Published online: 13 May 2022 *

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