動的地盤ばねの幾何学的非線形性を考慮した基礎浮上り解析

概要

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The method of a seismic response analysis considering the uplift of a base mat based on the wave propagation theory is proposed. In order to consider the effect of vertical response that results from the uplift and from a vertical input motion, the nonlinearity of spring constants and viscous damping coefficients due to reduction of the contact area between the base mat and the ground is introduced. The spring constants are given by the static spring constants of a rectangular foundation, and the damping coefficients are calculated from the imaginary part of dynamic impedance functions at the first natural frequency of the soil-structure system. The dynamic restoring forces of springs are obtained by considering the nonlinearity of springs and the eccentric length between the center of a base mat and of a contact area. As a result of an application to the typical BWR Mark II nuclear reactor building, it is found that the horizontal response is infuluenced a little by a vertical input motion but the vertical response is fairly generated by uplift.
一般社団法人日本建築学会の論文