Effects of Spatial Variable Ground Motions on the Seismic Response of Base-Isolated Building

Abstract:

Aimed to base-isolated building with large plane dimension, the change laws of seismic response for base-isolated building under spatial variable ground motions were researched. Firstly, the artificial spatial variable earthquake time histories were generated using spectral representation method based on code response spectrum. Then the 3-D FEM modal of one based-isolated building with large plane dimension was established and the seismic response of based-isolated building under spatially ground motion was studied by nonlinear time history analysis. The mitigation effects of based-isolated building with large plane dimension were compared each other at the cases of uniform excitation, non-uniform excitation considering only wave passage effect, non-uniform excitation considering both the wave passage effect and incoherence effect, multi-component uniform excitation, multi-component non-uniform excitation considering the wave passage effect and multi-component non-uniform excitation considering both the wave passage effect and incoherence effect. The results show that the seismic response of base-isolated structure with large plane dimension under the uniform excitation is relative safety. When the base-isolated building with large plane dimension is designed by time history analysis, the spatial variability of earthquake ground motion effects can be considered.

• Periodical: Advanced Materials Research (Volumes 163-167)
• Pages: 4422-4428
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.163-167.4422
• Online since: December 2010
• Authors: Yong Qin Lei, Yong Feng Du
• Keywords: Base-Isolated Building, Multi-Component Excitation, Non-Linear Analysis, Seismic Response, Spatial Variability

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