Seismic Analysis of Shallow Foundation on Layered Soil Deposits

Author(s): Supriya Mohanty and M.V. Ravi Kishore Reddy
Paper category: Proceeding
Book title: International Conference on Advances in Civil Engineering and Sustainable Construction
Editor(s): T.Ch. Madhavi, G. Prabhakar, Santhosh Ram, and P.M. Rameshwaran
Print-ISBN: None
e-ISBN: 978-2-35158-161-2
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 130-135
Total Pages : 6
Language : English

Abstract: In this paper an attempt has been made to study the response of a shallow foundation resting on layered soil deposits subjected to seismic excitation. Here, two dimensional finite element techniques have been employed to model the foundation-soil-interaction system using CyclicTP software. For the numerical analysis a continuous footing founded in a sandy stratum underlain by clay stratum has been considered. The most recent Nepal Earthquake (April 25, 2015, Mw=7.8) has been considered as input motion for the seismic analysis. The results are presented in terms of acceleration time history, horizontal and vertical displacement time history, excess pore pressure time history, shear stress vs shear strain variation and shear stress vs effective confinement variation at different locations. From the results, accelerations and displacements are observed to be more at centre of the footing as compared to other locations. The peak ground acceleration (PGA) decreases with increase in depth at different locations. More variation in acceleration has been noticed at the centre of the footing. Horizontal displacement is observed to be more as compared to vertical displacement. For safe design, the foundation must be safe both for the static as well as the dynamic loads imposed by the earthquake. Hence, it is necessary to perform seismic analysis of structures resting on layered soil deposit.

Online publication: 2017
Publication type: full_text
Public price (Euros): 0.00