Evaluation of dynamic eccentricity by considering soil–structure interaction: a proposal for seismic design codes
✍ Scribed by H. Shakib
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 321 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0267-7261
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✦ Synopsis
A stochastic approach is adopted for the linear analysis of three-dimensional dynamic soil -structure interaction of asymmetric buildings in the time domain to evaluate the dynamic eccentricity of torsional provisions in seismic building codes. The asymmetric system is idealized as a single-storey building resting on different soil conditions. The soil beneath the superstructure is modeled as linear elastic solid elements, and the effect of the surrounded unbounded soil is considered by imposing viscous boundary elements along the sides of soil block. The contact surface between foundation mat and solid elements of soil is discretized by linear plane interface elements with zero thickness. The interface element is further developed to accommodate the proper compatibility between rigid foundation and soil. However, the method can be adapted to include the effects of soil non-linearity and slip as well as the separation of the foundation mat on the response of asymmetric systems. The response of soil -structure interaction of torsionally coupled system under an ensemble of artificial non-stationary earthquake records has been reviewed to verify the dynamic eccentricity of torsional provisions in seismic building codes. The dynamic eccentricity obtained from this study is compare to the dynamic eccentricity of Uniform Building Code (UBC, 97) and Eurocode 94). By taking into consideration the role of the important structural parameters and the soil-structure interaction effects, a simple equation for the design eccentricity is proposed.