The effect of the strength and stiffness characteristics of a previously proposed novel column base on the seismic performance and collapse capacity of steel self-centering moment-resisting frames is evaluated in this paper. This is done through three normalised parameters that represent the initial stiffness, post-yield stiffness, and strength of the column base, which can be independently adjusted. For these evaluations, a prototype steel building, which serves as a case study, is designed with sixteen different cases of a self-centering moment-resisting frame with different column base stiffness and strength characteristics (SC-MRF-CBs). A self-centering moment-resisting frame with conventional column bases and the same members and beam-column connections as those of the SC-MRF-CBs, named SC-MRF, serves as a benchmark frame. A set of 44 ground motions was used to conduct non-linear dynamic analyses and evaluate the seismic performance of the frames. Incremental dynamic analyses were also performed with the same ground motions set to evaluate the collapse capacity of the frames. Collapse capacity fragility curves and adjusted collapse margin ratios of the frames were derived and used for the comparison of the seismic risk of the frames. The results show that the new self-centering column base significantly improves the seismic performance of the SC-MRF, demonstrating the potential of the SC-MRF-CBs to be redesigned with smaller member sections. Moreover, the SC-MRF-CBs achieve significant reduction in collapse risk compared to the SC-MRF. Finally, the results show that increasing the base strength and stiffness improves the seismic performance and collapse capacity of the SC-MRF-CBs. © 2020 Elsevier Ltd

中文翻译：

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具有不同柱底结构特性的自定心钢 MRF 的抗震倒塌

本文评估了先前提出的新型柱的强度和刚度特性对钢自定心抗弯框架的抗震性能和倒塌能力的影响。这是通过三个标准化参数完成的，这些参数代表初始刚度、屈服后刚度和柱基强度，这些参数可以独立调整。对于这些评估，作为案例研究的原型钢结构建筑设计有 16 个不同案例的自定心抗弯框架，具有不同的柱底刚度和强度特性 (SC-MRF-CB)。一个自定心抗弯框架，具有传统的柱底，与 SC-MRF-CB 相同的构件和梁柱连接，称为 SC-MRF，作为基准框架。一组 44 个地面运动用于进行非线性动力分析和评估框架的抗震性能。增量动态分析也使用相同的地面运动设置来评估框架的倒塌能力。推导出框架的抗倒塌能力脆性曲线和调整后的倒塌裕度比，用于框架抗震风险的比较。结果表明，新的自定心柱底座显着提高了 SC-MRF 的抗震性能，展示了 SC-MRF-CB 重新设计具有更小的构件截面的潜力。此外，与 SC-MRF 相比，SC-MRF-CB 显着降低了倒塌风险。最后，结果表明，增加基础强度和刚度可以提高 SC-MRF-CB 的抗震性能和抗倒塌能力。© 2020 爱思唯尔有限公司