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The Effect of Supporting Soil on Seismically Isolated Buildings of Variable Geometric Configurations with and without Shear Walls


The Effect of Supporting Soil on Seismically Isolated Buildings of Variable Geometric Configurations with and without Shear Walls
Authors : Dr. Haider S. Al-jubair , Dr. Fareed H. Al-mosawi
Publication Date: 15-03-2017

Authors

Author(s):  Dr. Haider S. Al-jubair , Dr. Fareed H. Al-mosawi

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Volume. 6 - Issue. 03 , March - 2017

e-ISSN:   2278-0181

Abstract

Multi – story reinforced concrete buildings of various geometric configurations (symmetrical, vertically irregular, and horizontally irregular); with and without shear walls; having different base conditions (fixed, isolated using high damping rubber bearing and friction pendulum systems); resting on different soil characteristics (medium dense sand and dense sand), are analyzed by using finite element method under seismic load function (North – South component of the ground motion recorded at a site in El Centro, California in 1940). The bilinear hysteretic model of base isolation system and the Rayleigh damping framework for superstructure and soil are adopted. It is proved that, the base isolation is very effective technique in reducing the earthquake responses and that, the friction pendulum system is more efficient in reducing the earthquake responses compared to the high damping rubber bearing isolators of the same design displacement and fundamental period. Also, including the supporting soil in the analysis will increase the base shear and increasing the soil elastic parameters and angle of internal friction, reduces the base shear considerably for the fixed base structure but, has negligible effects on the base shear for the isolated structures.

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