Earthquake Ground Motion Parameters for Structural Design in Nepal
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Pulchowk Campus
Abstract
The study on “Earthquake Ground Motion Parameter for Structural Design in Nepal”
is carried out in two parts: in the first part, the probabilistic seismic hazard analysis is
carried out for the Kathmandu Valley considering 10-active faults as earthquake
sources; the recurrence law proposed by Gutenberg-Richter is used. The intensity of
earthquake at the center of Kathmandu valley in terms of PGA and SA is obtained by
adopting the attenuation law proposed by Youngs et al (1997) and poison’s process
for occurrence of earthquakes. Using conditional probability of magnitude of
earthquake and source to site distance, the probabilistic seismic hazard curves are
obtain at the bed rock, free field as well as separately assuming soil amplification
factor of 2. In the second part of the study, a single envelope of the spectral ordinates
are obtained using Young’s et al empirical relationship due to all sources for bed rock
and free field separately, which are used to simulate Time-Histories at the bed rock as
well at free field . The study shows that the contribution of Source Gosai Kunda
(MCT-3.30) in Seismic Hazard curves is larger compare to the other sources and it is
considered to be the vulnerable source for Kathmandu City. The program developed
in Visual Fortran which generates time history from response spectra and gives good
result within 20 iterations. Results are verified using Standard Software
(SeismoSignal).