Evaluation of Building Performance During the Loma Prieta Earthquake Based on Strong-Motion Records

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。研究的目的是利用这些记录：(1)对振动周期和阻尼值的时变性质进行全面的建筑性能研究，以及(2)估计最大楼层漂移，这是评估可能的建筑损坏的关键参数。在国家自然科学基金资助的相关研究项目中，将采用一种成熟的系统辨识方法进行参数辨识，该方法在精度和效率上都有所提高。将对大约40个建筑记录进行振动周期和阻尼值的识别。楼层位移估计需要开发一种新的方法，并将在选定的建筑中进行。建筑周期、阻尼和楼层漂移的时变特性将被用来评估和校准建筑损坏状态。所获得的信息将构成建筑性能评估程序的基础。在此基础上，提出了一种基于强震记录的震后建筑物性能评估方法，为今后的应用提供参考。

This is a post Loma Prieta earthquake (Oct. 1989) investigation project in learning from this damaging event. The objectives of the research are to use these records to: (1) conduct a comprehensive building performance study for the time-varying nature of vibration periods and damping, and (2) estimate the maximum story drift, a crucial quantity for the assessment of possible building damage. A well established system identification method, improved in accuracy and efficiency in a related research program supported by the National Science Foundation, will be used for the parameter identification in this research. The identification of the vibration period and damping will be carried out for about 40 building records. The story drift estimation requires the development of a new method and will be carried out for selected buildings. The time-varying nature of the building period, damping, and story drift will be used to assess and calibrate the building damage state. The information obtained will form the basis for a building performance evaluation procedure. Based on the findings of this research, a procedure of post-earthquake building performance evaluation using strong motion records will be recommended for future applications.