Effect of Redundancy in Buildings under Seismic Loads

在最近的地震中，一些建筑物的性能不佳，结构可靠性/冗余已成为建筑行业的一个严重问题。本课题对结构冗余进行了系统的研究，并将其应用于设计实践。在结构动力和可靠性分析的框架内，系统地检查了主要冗余因素的影响，重点是结构配置，构件延性能力，超强度，结构部件的相互作用和扭转运动。本文采用了最近SAC钢构项目的构件和体系性能分析和试验结果。然后开发出一个风险一致的冗余系数，用于计算设计力，从而使不同配置和设计的结构能够满足基于可靠性的性能要求。拟议研究的影响将及时有助于对结构冗余的基本理解，并为规范和标准中基于性能的冗余设计因素制定合理的基础。

Structural reliability/redundancy has become a serious concern in the building industry after the poor performance of some buildings in recent earthquakes. This research project carries out a systematic investigation of structural redundancy and application to design practice. Within the framework of structural dynamic and reliability analyses, the effects of major redundancy-contributing factors are systematically examined, with emphasis on structural configuration, member ductility capacity, over-strength, interaction of structural components, and torsional motions. Recent SAC Steel Project analytical and experimental results of structural member and system behavior are used. A risk-consistent redundancy factor is then developed for calculating the design forces such that structures of different configurations and designs can meet reliability-based performance requirements. The impact of the proposed research will be a timely contribution to fundamental understanding of structural redundancy and the development of a rational basis for a performance-based redundancy design factor in codes and standards.