Robust Performance-based Design of Concentrically Braced Steel Frame Buildings

摘要：钢支撑框架结构，特别是同心支撑框架，在美国迅速普及。考虑到(a)传统弯矩框架结构的成本和复杂性，(b)框架结构中与大横向位移相关的破坏和破坏，以及(c)许多地区地震设计力的大幅增加，导致工程师越来越依赖于同心支撑框架的固有强度和刚度。然而，传统的同心支撑框架的抗震性能受到质疑。本项目系统地建立在一个重要的，但目前脱节的现有实验，理论和分析研究的身体。通过整合这些知识，补充有关现代和创新支撑框架系统行为的重要新数据，并开展集中的数值模拟程序，对这些系统的复杂非线性行为有了更全面的了解，并在基于性能的地震工程评估框架内使用，以评估改善地震性能的可能创新策略，并为设计和分析制定稳健的指导方针。

Abstract: Steel braced frame structures, especially concentrically braced frames, and are rapidly gaining popularity across the US. Concerns about (a) the cost and complexity of traditional moment frame construction, (b) the damage and disruption associated with large lateral displacements in frame structures, and (c) the substantial increases in seismic design forces in many regions are leading engineers to rely increasingly on the inherent strength and stiffness of concentrically braced frames. However, the seismic behavior of conventional concentrically braced frames has been questioned. This project systematically builds upon a significant, but currently disjoint body of existing experimental, theoretical and analytical research. By integrating this knowledge, supplementing it with important new data regarding the behavior of modern and innovative braced frame systems and undertaking a focused program of numerical simulations, a more comprehensive understanding of the complex nonlinear behavior of these systems is developed and used within a performance-based earthquake engineering evaluation framework to evaluate possible innovative strategies for improving seismic performance and to devise robust guidelines for design and analysis.