To assess the safety of structures after the occurrence of an earthquake or decide about demolition or repair of structures, maximum residual interstory drift ratio (MRD) is one of the most important engineering demand parameters. For evaluating the probability of exceedance of MRD in structure from a specified limit, nonlinear dynamic analyses are performed by employing an intensity measure (IM). IMs link the structural seismic response analyses with the seismic hazard analysis. Employing an optimal IM in seismic evaluation of structures makes the results more realistic and reliable. The power of an IM to predict the seismic response of structures with low dispersion is called efficiency. Moreover, the ability of an IM for rendering the seismic response of structures independent from the other features of the ground motion is named sufficiency. In this study, the efficiency and sufficiency of some traditional and advanced IMs (including scalar and vector ones) for predicting MRD capacity of steel buckling restrained braced frames are evaluated. It is shown that all of the IMs considered do not have sufficiency with regard to scale factor (SF). Then, (Sa(T₁),SaRatio_Op‒D) as an optimal vector IM (optimized by multi-objective particle swarm optimization algorithm) having improved sufficiency with regard to SF is proposed.

为了评估地震发生后建筑物的安全性或决定建筑物的拆除或维修，最大残余层间位移比（MRD）是最重要的工程需求参数之一。为了评估从指定极限超出结构中MRD的可能性，可通过使用强度测量（IM）进行非线性动力学分析。IM将结构地震响应分析与地震危害分析联系起来。在结构的抗震评估中采用最佳IM可以使结果更加真实可靠。IM预测低色散结构的地震响应的能力称为效率。此外，IM能够使结构的地震响应独立于地震动的其他特征的能力称为充分性。在这项研究中，评估了一些传统的和高级的IM（包括标量和矢量的IM）在预测钢屈曲约束支撑框架的MRD能力方面的效率和充分性。结果表明，所考虑的所有IM在比例因子（SF）。然后，提出了（Sa（T ₁），SaRatio _Op‒D）作为具有充分的SF充分性的最优矢量IM（通过多目标粒子群优化算法优化）。