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首页> 外文期刊>Journal of structural engineering >Parametric Collapse Performance of Low-Ductility Concentrically Braced Frames with Reserve Capacity
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Parametric Collapse Performance of Low-Ductility Concentrically Braced Frames with Reserve Capacity

机译：低延展性的参数塌陷性能具有储备容量的低延展性同心支撑框架

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摘要

In moderate-seismic regions, cost-effective steel building design solutions such as the R = 3 and ordinary concentrically braced frame (OCBF) systems do not consistently provide reliable life-safety protection. The collapse performance behaviors of these systems are not thoroughly substantiated by experimental or historical evidence. Thus, a numerical study consisting of 2 conventional and 216 parameterized variations of a prototype seismic force-resisting system (SFRS) was developed to (1) investigate low-ductility braced frame failure mechanisms and collapse performance capabilities; (2) quantify the influences of key design parameters on probabilistic collapse capacity; and (3) provide the basis for development of a robust and socioeconomically viable design alternative for low-ductility concentrically braced frame (CBF) systems. Collapse probabilities were assessed through numerical simulations of ground motion excitations using incremental dynamic analysis (IDA), and variations in collapse probabilities were quantified with respect to five design parameters using an ANOVA model. The results indicate that the collapse probabilities of low-ductility CBF systems can be substantially reduced through design parameters that promote favorable failure hierarchies and provide deliberately engineered reserve capacity. (C) 2021 American Society of Civil Engineers.
机译：在中间地震区域中，r = 3和普通同心支撑框架（OCBF）系统等经济高效的钢结构设计解决方案并不一致提供可靠的寿命安全保护。这些系统的崩溃性能行为并不通过实验或历史证据彻底证实。因此，开发了由216个常规和216个参数化变化组成的数值研究，并开发到（1）研究低延延长支撑框架故障机制和折叠性能能力; （2）量化关键设计参数对概率塌陷能力的影响; （3）为开发稳健和社会经济可行的设计替代方案的基础，用于低延展性同心支撑框架（CBF）系统。通过使用增量动态分析（IDA）的地面运动激发的数值模拟来评估崩溃概率，并且使用ANOVA模型对五个设计参数量化崩溃概率的变化。结果表明，通过促进有利故障层次结构的设计参数，可以显着降低低延展性CBF系统的崩溃概率，并提供故意设计的储备容量。 （c）2021年美国土木工程师协会。

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