Interaction Effects on Pile-Supported Structure Subject to Severe Ground Motion

这是洛马普里埃塔地震(1989年10月)后的一次调查项目，目的是从这一破坏性事件中吸取教训。这个项目研究了一种特殊的结构，它在地震中遭受相当大破坏的类似建筑中表现得非常好。由于旧金山机场附近的软土条件，克拉里昂酒店综合体位于一个测量到高地面加速度的地区。强加固桩基础与土介质的相互作用可能通过调动辐射和滞回阻尼力来提供有益的效果。此外，桩的柔性可能比固定基础结构提供了更长的周期。土-桩-结构相互作用对部分酒店性能的影响将采用频域复杂反应分析和非线性时程分析进行研究。该分析利用并扩展了先前开发的方法，以关注实际案例中的交互影响。预期的重要结果包括根据相互作用和固定基础模型计算的建筑物和基础构件中的作用力的比较，以及对桩灵活性产生的周期位移的评估。

This is a post Loma Prieta earthquake (Oct. 1989) investigation project in learning from this damaging event. This project studies one particular structure which faired remarkably well amidst similar buildings which suffered considerable damage during the earthquake. The Clarion Hotel complex is located in a region where high ground accelerations were measured due to the soft soil conditions near the San Francisco Airport. Interaction of the heavily reinforced pile foundation with the soil medium is suspected to have provided beneficial effects by mobilizing radiation and hysteretic damping. In addition, the pile flexibility may have provided a longer period than present in a fixed base structure. The effects of soil-pile-structure interaction on the performance of a portion of the hotel will be investigated using a complex response analysis in the frequency domain and a nonlinear time history analysis. The analysis utilizes and extends a methodology developed earlier to focus on interaction effects in an actual case. Important results expected include a comparison of the forces acting in the building and foundation elements as computed from the interactive and fixed base models, and an assessment of the period shift produced by pile flexibility.