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PROCEEDINGS OF THE THIRTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping and Y. Tsompanakis
Seismic Modal Response Histories of Two-Way Asymmetric Adjacent Buildings with Soil-Structure Interaction Effects Subject to Earthquake Excitations
M.N.S. Hadi and M.E. Uz
School of Civil, Mining and Environmental Engineering, University of Wollongong, NSW, Australia
M.N.S. Hadi, M.E. Uz, "Seismic Modal Response Histories of Two-Way Asymmetric Adjacent Buildings with Soil-Structure Interaction Effects Subject to Earthquake Excitations", in B.H.V. Topping, Y. Tsompanakis, (Editors), "Proceedings of the Thirteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 217, 2011. doi:10.4203/ccp.96.217
Keywords: earthquake engineering, impact effects, soil-structure interaction, asymmetry.
Building structures are often built close to each other because of lack of available land in metropolitan cities. Building complexes have often been found to impact on each other under earthquake induced strong ground motion. Thus, there is a need to study the effect of base isolation on the pounding of buildings. A formulation for the multi-degree-of-freedom (MDOF) coupled buildings is used for the analytical studies of this research. Pounding forces are calculated by the Coulomb friction model. Hence, the coefficient of friction and coefficient of restitution for the energy dissipation have been assumed constant during impact . The soil-structure interaction (SSI) forces are modelled in the form of the frequency-independent soil springs and dashpots when modelling the coupled buildings resting on the surface of an elastic half-space [2,3].
The resulting systems of the second order constant coefficient equations are reformulated as a system of first order ordinary differential equations and solved using the ordinary differential equation solver of MATLAB. The effects of impact and the SSI systems will be introduced into equations for the coupled buildings modelled as inelastic and elastic systems. The total response analysis of buildings based on the deformation of the coupled buildings during earthquakes is described herein. The Elcentro 1940 record is used to examine the seismic response of two buildings in this study.
The analysis results of this study show that the lateral torsion response of the two buildings is affected when impact takes place with the adjacent buildings. The modal response histories of the lighter and heavier buildings are significantly reduced due to the effect of the small SSI. Further, it is also observed that the roof twist of the lighter building which is assumed to be inelastic is decreased for the large SSI effect compared to the small SSI effect. At high shear wave velocity, the two buildings are slightly on the conservative side. Finally, with the increased shear wave velocity, the impact response of buildings is significantly severe. The specific objectives of this study will result in a more efficient structural systems to mitigate earthquake effects.
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