SPECIFIC SITE RESPONSE ANALYSIS ON THE DIFFERENT EARTHQUAKE MOTION IN KATHMANDU VALLEY
Date
2023-12
Authors
Adhikari, Saroj Prasad
Journal Title
Journal ISSN
Volume Title
Publisher
I.O.E. Pulchowk Campus
Abstract
Seismicity is a critical concern in Nepal, particularly in the Kathmandu Valley, a
region characterized by complex geological and geotechnical conditions. A Study
presents a comprehensive site-specific response analysis of the Kathmandu Valley,
employing the DEEPSOIL software for non-linear one-dimensional analysis to provide
a thorough understanding of the valley’s seismic behaviour, with a focus on
the impact of five distinct earthquake motions, including the Gorkha Earthquake,
Loma Gilroy Earthquake, Aftershocks of Gorkha Earthquake, Chi-Chi Earthquake,
and Kobe Earthquake. The study offers a thorough summary of the amplification
factors (AF) and earthquake events for seismic hazard assessments and engineering
designs on how the ground motion is amplified or attenuated during seismic events.
In comparison to other input motions, the result demonstrates a larger value of amplification
factor for the Gorkha Earthquake motion and its aftershocks motion. The
Kobe earthquake motion represents the remarkable exception, where amplification
considerably decreased. Balaju stands out as the region with the highest ground
motion amplification, which can be related to the existence of layers of gray loose
micaceous silty fine sand in its subsurface geology. Additionally, this study compares
its findings of the site-specific spectral acceleration with the recommended design
spectra of IS 1893:2016 and NBC 205:2020 for a 5% damping ratio. Specifically
considering the soft soil and very soft soil conditions as per IS 1893:2016 and NBC
205:2020, respectively, this analysis offers a critical evaluation of how the predicted
spectral accelerations correspond with designated seismic design principles.
Description
Seismicity is a critical concern in Nepal, particularly in the Kathmandu Valley, a
region characterized by complex geological and geotechnical conditions. A Study
presents a comprehensive site-specific response analysis of the Kathmandu Valley,
employing the DEEPSOIL software for non-linear one-dimensional analysis to provide
a thorough understanding of the valley’s seismic behaviour, with a focus on
the impact of five distinct earthquake motions, including the Gorkha Earthquake,
Loma Gilroy Earthquake, Aftershocks of Gorkha Earthquake, Chi-Chi Earthquake
Keywords
Amplification,, DEEPSOIL,