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Evaluation of displacement coefficient method for seismically retrofitted buildings with various ductility capacities

机译：各种延性承载力的抗震加固建筑位移系数方法的评估

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摘要

This research study is aimed at evaluating the accuracy of the displacement coefficient method (DCM) of FEMA 440 and associated nonlinear static procedure (NLSP) for actual buildings with soft story mechanism and various ductility capacities. The DCM and associated NLSP are evaluated using two existing seismically vulnerable buildings with soft story mechanism. The buildings are first retrofitted using a ductile steel-brace-link system to represent those with good ductility capacity and then retrofitted with RC squat infill shear panels (SISPs) to represent those with relatively poor ductility capacity. The evaluation of the DCM of FEMA 440 and associated NLSP is then performed by comparing the roof displacements (target displacements), maximum interstory drifts, and maximum plastic hinge rotations of the original and retrofitted buildings obtained from NLSP (at the target displacement level of DCM) with those obtained from nonlinear response history (NRH) analyses for three different seismic performance levels. It is observed that the DCM, and hence, the NLSP fail to accurately predict the NRH analyses results mainly due to uncertainties in the coefficient Ci of the DCM in the short period range, the inability of the DCM to capture the failure of structural members beyond a certain lateral displacement or plastic rotation limit and associated soft story mechanism.
机译：这项研究旨在评估FEMA 440的位移系数法（DCM）和相关的非线性静态程序（NLSP）对于具有软故事机制和各种延展能力的实际建筑物的准确性。 DCM和关联的NLSP是使用两个现有的具有软故事机制的地震脆弱建筑物进行评估的。首先对建筑物进行延展，使用延性钢-拉杆连接系统来代表具有良好延展性的建筑物，然后对RC蹲式填充剪力板（SISP）进行延展，以代表延展性相对较差的建筑物。然后，通过比较从NLSP获得的原始和翻新建筑物的屋顶位移（目标位移），最大层间位移和最大塑料铰链旋转（以DCM目标位移水平），对FEMA 440和相关NLSP的DCM进行评估。 ），以及从非线性响应历史（NRH）分析获得的三种不同地震性能水平的数据。观察到DCM，因此NLSP无法准确预测NRH分析结果，这主要是由于DCM的系数Ci在短时期内的不确定性，DCM无法捕获超出范围的结构构件的失效所致。一定的横向位移或塑性旋转极限以及相关的软故事机制。

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