Development of an Enhanced Pushover Procedure for Performance-Based Seismic Evaluation of Buildings

该奖项通过对现有和不断发展的推覆方法进行详细和全面的研究，解决了控制结构体系设计的层间漂移和失效机制的问题。最近作出了几项努力，通过在评价过程中间接纳入高模效应来加强FEMA-273(1997)类型的程序。虽然这些新程序已被证明在选择性研究中有效，但尚未对这些技术进行全面评估，以确定其范围和局限性。拟议的评估将对选定的六座现有建筑物进行，这些建筑物拥有最近地震的仪表化数据。这六座仪表化建筑将涵盖一系列实际的建筑工期。分析中使用的建筑模型将根据测量的反应进行校准，从而确保随后的评价工作的可靠性。这些评估任务将分两个阶段进行：第一阶段将集中于FEMA-273的三个程序，第二阶段将处理改进的多模式和自适应Pushover技术。鉴于目前地震工程的实践状况已开始接受Pushover分析作为基于性能的地震工程(PbSe)可能的下一步，应认识到该项目的重要性。在设计室可以进行常规的非线性时程分析之前，开发简化但可靠的静态程序的需要对PbSe的进步至关重要。

This award addresses the issue of inter-story drift and failure mechanisms that control the design of a structural system by carrying out a detailed and comprehensive study of both existing and evolving pushover methods. There have been several recent efforts to enhance FEMA-273 (1997) type procedures by indirectly incorporating high-mode effects in the evaluation process. While these new procedures have been shown to work in selective studies, a comprehensive evaluation of such techniques which identify their scope and limitations has yet to be conducted. The proposed evaluation will be carried out on a selected group of six existing buildings for which instrumented data from recent earthquakes is available. The six instrumented buildings will cover a practical range of building periods. The building models to be used in the analyses will be calibrated to measured response thereby ensuring the reliability of the ensuing evaluation exercises. These evaluations tasks will be conducted in two phases: the first phase will focus on the three FEMA-273 procedures, and the second phase will deal with improved multi-mode and adaptive pushover techniques.The importance of this project is to be recognized in light of the fact that the current state-of-practice in seismic engineering has begun to accept pushover analyses as a possible next step in the advancement of performance-based seismic engineering (PBSE). Until such time that routine nonlinear time-history analyses can be carried out in a design office, the need to develop simplified yet reliable static procedures is critical to the advancement of PBSE.