Abstract
Strong earthquake lateral forces can induce base overturning moments that exceed the available overturning resistance due to gravity loads causing uplift of the basemat. To address the problem of uplift, a time domain BEM-FEM methodology for a two-dimensional plane strain soi I-structure interaction problem is presented. The Boundary Element Method (BEM) is applied to the soil medium and the Finite Element Method (FEM) is applied to the foundation and the super-structure. FEM interface elements are utilized to effectively simulate foundation uplift from the underlying soil medium. The two methods are combined through displacement compatibility and force equilibrium considerations at the soil-foundation interface. A representative problem of a nuclear containment structure subjected to the El Centro earthquake of 1940 is analyzed using the rigorous BEM-FEM. The results indicate that the base shear at the foundation-structure interface can cause malevolent or benevolent effects depending on various structural and soil parameters. Further, it is concluded that the effects of uplift on the structure response can not be predicted from the linear behavior under bilateral contact conditions.
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