Robust Performance-based Design of Concentrically Braced Steel Frame Buildings

摘要：钢支撑框架结构，尤其是中心支撑框架，正在全美迅速流行起来。考虑到(A)传统弯矩框架结构的成本和复杂性，(B)框架结构中较大的横向位移带来的破坏和破坏，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中心支撑框架的固有强度和刚度。然而，传统的中心支撑框架的抗震性能受到了质疑。该项目系统地建立在现有的实验、理论和分析研究的重要但目前相互脱节的主体之上。通过整合这些知识，补充有关现代和创新的支撑框架体系行为的重要新数据，并实施有重点的数值模拟程序，可以更全面地了解这些体系的复杂非线性行为，并在基于性能的地震工程评估框架内使用，以评估可能的创新策略，以改善抗震性能，并制定可靠的设计和分析指南。

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.