【作者】 董志骞； 李钢； 李宏男；

【Author】 DONG Zhi-qian;LI Gang;LI Hong-nan;State Key Laboratory of Costal and Offshore Engineering, Dalian University of Technology;

【机构】 大连理工大学海岸与近海工程国家重点实验室；

【摘要】 钢框架-中心支撑结构(Steel Concentrically Braced Frame,简称CBF)是一种典型的双重抗侧力体系,由于具有较好的抗侧力性能,在工程中应用广泛。CBF体系在支撑破坏之后,框架部分依然可以提供可观的强度与刚度,但其储备能力与抗倒塌能力并不明确。增量动力分析(IDA)是一种评价结构抗倒塌能力的方法,本文通过对单自由度CBF体系进行延性时程分析,得到了基于IDA的倒塌延性谱。通过比较体系的倒塌延性与延性需求,可以得到各参数条件下体系的适用周期与临界周期,供设计参考。更多还原

【Abstract】 Steel concentrically braced frame is a typical kind of dual system in steel structure. It is widely used for its large initial lateral stiffness, and the secondary strength and stiffness after braces fracture plays an important role in seismic collapse prevention. But its restoring capacity and collapse capacity is uncertain in prior study. Incremental dynamic analysis(IDA) is an efficient method to evaluate the collapse capacity. In this paper, ductile history analysis was performed to construct the IDA-based collapse ductility spectra. The variations in behavior for all periods of CBFs were disscussed based on ductility demand spectra and collapse ductility spectra.更多还原