ABSTRACT

Prior studies, which have been limited to horizontal ground shaking, have generally concluded that soil–structure interaction (SSI) has a negligible influence on the seismic response of isolated buildings. In this study, the effect of SSI on the response of a computational model of an isolated building using triple friction pendulum bearings is investigated. The analysis shows that SSI can amplify story drifts and accelerations when the model is subjected to 3-D shaking including a vertical component. Amplification occurs due to a vertical-horizontal coupling effect that is explained using the modal properties of the numerical model. Based on a parametric study using the key parameters of foundation system, it is concluded that amplification occurs when the effective shear wave velocity of the soil falls into a specific range. In this case, the response of the computational model is very sensitive to the hysteretic damping ratio of the soil, Poisson’s ratio of the soil and the footing size.

摘要

先前的研究仅限于水平地面震动，一般认为土壤-结构相互作用（SSI）对孤立建筑物的地震响应影响可以忽略不计。在这项研究中，研究了 SSI 对使用三重摩擦摆轴承的孤立建筑物计算模型响应的影响。分析表明，当模型受到包括垂直分量的 3D 震动时，SSI 可以放大故事漂移和加速度。由于使用数值模型的模态特性解释的垂直-水平耦合效应而发生放大。通过对地基系统关键参数的参数化研究，得出当土体的有效剪切波速度落入特定范围时，会发生放大现象。在这种情况下，