Abstract In this study, the performance of a proposed friction damper with two slip loads in controlling the seismic response of steel moment resisting buildings structures under moderate and intense earthquake excitations is investigated. The proposed friction damper initially operates with a smaller slip load and could shift to the higher slip load after a certain amount of slippage when subjected to intense ground motions. In this regard, the hysteresis behavior of the proposed double slip loads (DSL) friction damper is modeled and after necessary verifications is imported to the material library of OpenSees software to be used for parametric study. To evaluate the performance of the proposed DSL damper, three steel moment resisting frame (SMRF) models with 4, 8 and 14 stories are considered that are designed according to the AISC-LRFD and ASCE7-16 codes. Using a suite of earthquake records, nonlinear time history analyses (N-THA) are carried out to determine the optimal slip loads as well as the optimal amount of the slippage in between to minimize the seismic response of the considered models. The smaller slip load is optimally determined by performing N-THA on the structural models equipped with a single slip load friction damper using the earthquake records that are scaled to the design basis earthquake (DBE) level. Then, utilizing the obtained first slip load, N-THA are repeated for the models equipped with DSL friction dampers using the same earthquake records that are now scaled to the maximum credible earthquake (MCE) level to optimally determine the second slip load as well as the amount of the slippage between two slip loads. The genetic algorithm is employed to find the optimal slip loads and the amount of slippage in between. Two scenarios for height-wise variation of the DSL parameters, i.e, the slip loads and the extent of slippage, of the SMRF models are considered. In the first scenario as a practical approach, an upward decreasing pattern of slip loads along the height of the buildings is considered. In second scenario a simple search is performed to optimally identify those parameters for all floors. Furthermore, the performance of the structural models with DSL dampers are compared with those equipped with conventional single slip load systems. The results clearly demonstrate the efficiency of the proposed DSL dampers in effectively reducing the seismic response of the structures in terms of story drifts, residual drifts, absolute floor accelerations, and base shear forces in comparison to the conventional single slip load friction dampers.

中文翻译：

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一种控制结构地震反应的新型双滑移摩擦阻尼器

摘要 在这项研究中，研究了一种具有两个滑动载荷的摩擦阻尼器在控制钢结构抗弯建筑结构在中度和强烈地震激发下的地震响应的性能。所提出的摩擦阻尼器最初以较小的滑动载荷运行，当受到强烈的地面运动时，在一定量的滑动后可以转移到较高的滑动载荷。在这方面，对所提出的双滑动载荷 (DSL) 摩擦阻尼器的滞后行为进行建模，并在必要的验证后将其导入 OpenSees 软件的材料库以用于参数研究。为了评估所提出的 DSL 阻尼器的性能，三个钢制抗弯框架 (SMRF) 模型与 4，8 层和 14 层被认为是根据 AISC-LRFD 和 ASCE7-16 规范设计的。使用一组地震记录，进行非线性时程分析 (N-THA) 以确定最佳滑动载荷以及两者之间的最佳滑动量，以最小化所考虑模型的地震响应。较小的滑动载荷是通过使用按设计基准地震 (DBE) 级别缩放的地震记录对配备有单个滑动载荷摩擦阻尼器的结构模型执行 N-THA 来优化确定的。然后，利用获得的第一滑移载荷，对于配备 DSL 摩擦阻尼器的模型，使用相同的地震记录重复 N-THA，这些地震记录现在缩放到最大可信地震 (MCE) 级别，以最佳地确定第二个滑动载荷以及两个滑动载荷之间的滑动量. 遗传算法被用来寻找最佳滑动载荷和两者之间的滑动量。考虑了 SMRF 模型的 DSL 参数（即滑动载荷和滑动程度）的高度变化的两种情况。在作为实用方法的第一种情况中，考虑了沿建筑物高度向上递减的滑动载荷模式。在第二种情况下，执行简单搜索以最佳地识别所有楼层的这些参数。此外，将带有 DSL 阻尼器的结构模型的性能与配备传统单滑动载荷系统的结构模型进行比较。结果清楚地表明，与传统的单滑动载荷摩擦阻尼器相比，所提出的 DSL 阻尼器在有效降低结构在楼层漂移、残余漂移、绝对地板加速度和基础剪力方面的地震响应方面的效率。