Analysis of Increased Shears and Overturning Moments in Structures by Ground Rocking During Loma Prieta, October 17,1989 Earthquake

这是洛马普里埃塔地震(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。研究地震的摇摆运动对结构响应的影响是本课题的主旨。地震动的摇摆分量通常被认为是小的，因此其影响被忽略。然而，在某些情况下，结构、场地位置和地震运动的组合条件使得摇摆分量变得重要。在这个项目中，将研究损伤分布，以确定摇摆运动在哪里导致建筑物的损坏，这些建筑物的设计没有考虑到这些额外的影响。根据记录的平移运动，将使用整个湾区的地质和土壤数据来估计不同地点的摇摆运动贡献。然后，生成的数据将用于分析不同结构的摇摆响应。这项研究将使工程师能够合理地确定摇摆运动在考虑或不考虑附加地震力的结构设计的地震安全性中的重要性。

This is a post Loma Prieta earthquake (Oct. 1989) investigation project in learning from this damaging event. The gist of this project is to study the effect of rocking motion of the earthquake to the structural response. The rocking component of ground motion is generally considered to be small in magnitude and therefore its effects are neglected. There are however certain situations where the combined conditions of structures, site location, and earthquake motions are such that the rocking component becomes important. In this project, the damage distribution will be studied to determine where the rocking motion contributed to the damages of the buildings which were not designed to account for these additional effects. Geology and soil data of the entire bay area will be used to estimate the rocking motion contributions at various sites based on the recorded translation motions. The generated data will then be used to analyze different structures for rocking response. This study will enable engineers to determine rationally the importance of rocking motion in the seismic safety of structures designed with or without consideration of such additional earthquake forces.