NDLI: Equivalent-Linear Seismic Ground Response Analysis of Some Typical Sites in Mumbai

Content Provider	Springer Nature Link
Author	Phanikanth, V. S. Choudhury, Deepankar Rami Reddy, G.
Copyright Year	2011
Abstract	Any earthquake event is associated with a rupture mechanism at the source, propagation of seismic waves through underlying rock and finally these waves travel through the soil layers to the particular site of interest. The bedrock motion is significantly modified at the ground surface due to the presence of local soil layers above the bedrock beneath the site of interest. The estimation of the amplifications in ground response due to the local soil sites is a complex problem to the designers and the problem is more important for mega cities like Mumbai in India, where huge population may get affected due to devastations of earthquake. In the present study, the effect of local soil sites in modifying ground response is studied by performing one dimensional equivalent-linear ground response analysis for some of the typical Mumbai soil sites. Field borelog data of some typical sites in Mumbai city viz. Mangalwadi site, Walkeswar site, BJ Marg near Pandhari Chawl site are considered in this study. The ground responses are observed for range of input motions and the results are presented in terms of surface acceleration time history, ratio of shear stress to vertical effective stress versus time, acceleration response spectrum, Fourier amplitude ratio versus frequency etc. The typical amplifications of ground accelerations considering four strong ground motions with wide variation of low to high MHA, frequency contents and durations are obtained. Results show that MHA, bracketed duration, frequency content have significant effects on the amplification of seismic accelerations for typical 2001 Bhuj motion. The peak ground acceleration amplification factors are found to be about 2.50 for Mangalwadi site, 2.60 for Walkeswar site and 3.45 for BJ Marg site using 2001 Bhuj input motion. The response spectrum along various soil layers are obtained which will be useful for designers for earthquake resistant design of geotechnical structures in Mumbai for similar sites in the absence of site specific data.
Starting Page	1109
Ending Page	1126
Page Count	18
File Format	PDF
ISSN	09603182
Journal	Geotechnical and Geological Engineering
Volume Number	29
Issue Number	6
e-ISSN	15731529
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-09-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ground response analysis Response spectrum Fourier amplitude ratio Maximum horizontal acceleration Mean time period Civil Engineering Terrestrial Pollution Geotechnical Engineering & Applied Earth Sciences Hydrogeology Waste Management/Waste Technology
Content Type	Text
Resource Type	Article
Subject	Soil Science Geology Architecture Geotechnical Engineering and Engineering Geology

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