Seismic Response and Retrofit Studies of Selected Steel and Composite Buildings

这是一个事后调查项目，旨在从1989年10月洛马普列塔地震中吸取工程教训。洛马普列塔地震提供了有关工程结构在强烈地面震动下性能的重要信息。从仪器建筑中产生的强震数据提供了一个独特的机会，可以进一步提高关于建筑物的地震行为和抵抗能力的知识，并为其设计开发改进的方法。在这个项目中，我们选择了三个钢结构和组合建筑结构进行详细的研究。一个遭受了严重的结构破坏，另一个经历了过度的摇摆运动，第三个表现出色。将进行两个主要的研究任务。首先是进行分析计算，利用记录的地下室运动来研究这些建筑物的地震反应，并将分析结果与记录的上层反应联系起来。对于严重损坏的建筑物，还将进行非弹性时程分析。第二项任务是制定改造或加强方案，以改善受损建筑和经历过度动力运动的建筑的抗震性能。该研究将基于大地震期间的性能数据，提高对钢结构抗震性能的理解。

This is a post-event investigation project to learn engineering lessons from the Loma Prieta earthquake (October 1989). The Loma Prieta earthquake has produced important information on performance of engineered structures subjected to strong ground shaking. The strong-motion data generated from the instrumented buildings provide a unique opportunity to further advance the knowledge about the seismic behavior and resistance of buildings and to develop improved methodologies for their design. Three steel and composite building structures have been selected for detailed studies in this project. One suffered serious structural damage, another experienced excessive sway motion, and the third showed excellent performance. Two main research tasks will be conducted. The first is to perform analytical calculations to study the seismic response of these buildings using the recorded motions at their basement and to correlate the analytical results with the recorded responses at the upper levels. For the seriously damaged building inelastic time- history analyses will also be carried out. The second task is to develop retrofit or strengthening schemes to improve the seismic performance of the damaged building and the building experiencing excessive dynamic motion. The study will improve the understanding of seismic behavior of steel structures based on the performance data during a major earthquake.