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Seismic performance and probabilistic collapse resistance assessment of steel moment resisting frames with fluid viscous dampers

机译：带有流体粘性阻尼器的抗弯矩钢框架的抗震性能和概率抗倒塌性能评估

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This paper evaluates the seismic resistance of steel moment resisting frames (MRFs) with supplemental fluid viscous dampers against collapse. A simplified design procedure is used to design four different steel MRFs with fluid viscous dampers where the strength of the steel MRF and supplemental damping are varied. The combined systems are designed to achieve performance that is similar to or higher than that of conventional steel MRFs designed according to current seismic design codes. Based on the results of nonlinear time history analyses and incremental dynamic analyses, statistics of structural and non-structural response as well as probabilities of collapse of the steel MRFs with dampers are determined and compared with those of conventional steel MRFs. The analytical frame models used in this study are reliably capable to simulate global frame collapse by considering full geometric nonlinearities as well as the cyclic strength and stiffness deterioration in the plastic hinge regions of structural steel members. The results show that, with the aid of supplemental damping, the performance of a steel MRF with reduced design base shear can be improved and become similar to that of a conventional steel MRF with full design base shear. Incremental dynamic analyses show that supplemental damping reduces the probability of collapse of a steel MRF with a given strength. However, the paper highlights that a design base shear equal to 75% of the minimum design base shear along with supplemental damping to control story drift at 2% (i.e., design drift of a conventional steel MRF) would not guarantee a higher collapse resistance than that of a conventional MRF. At 75% design base shear, a tighter design drift (e.g., 1.5% as shown in this study) is needed to guarantee a higher collapse resistance than that of a conventional MRF.
机译：本文评估了带有补充流体粘性阻尼器的抗弯矩钢框架抗倒塌的抗震性能。使用简化的设计程序来设计带有流体粘性阻尼器的四种不同的钢MRF，其中钢MRF的强度和补充阻尼会发生变化。组合后的系统旨在获得与根据当前抗震设计规范设计的常规钢MRF相似或更高的性能。基于非线性时程分析和增量动力学分析的结果，确定了带有阻尼器的钢制MRF的结构和非结构响应统计以及倒塌概率，并将其与常规钢制MRF进行了比较。通过考虑全部几何非线性以及结构钢构件的塑性铰区域中的循环强度和刚度退化，本研究中使用的分析框架模型可靠地能够模拟整体框架倒塌。结果表明，借助于附加阻尼，可以降低设计基准剪力的钢制MRF的性能，使其与具有完整设计基准剪力的传统钢制MRF相似。增量动力分析表明，补充阻尼可以降低给定强度下钢制MRF坍塌的可能性。但是，本文强调指出，等于最小设计基础剪力的75％的设计基础剪力以及用于将层间位移控制在2％的附加阻尼（即，常规钢MRF的设计位移）将不能保证比其更高的抗塌陷性常规MRF的。在设计基准剪切为75％的情况下，需要更严格的设计漂移（例如，本研究中显示为1.5％），以确保比常规MRF更高的抗塌陷性。

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