The development of fragility functions that express the probability of collapse of a building as a function of some ground motion intensity measure is an effective tool to assess seismic vulnerability of structures. However, a number of factors ranging from ground motion selection to modeling decisions can influence the quantification of collapse probability. A methodical investigation was carried out to examine the effects of component modeling and ground motion selection in establishing demand and collapse risk of a typical reinforced concrete frame building. The primary system considered in this study is a modern 6-story RC moment frame building that was designed to current code provisions in a seismically active region. Both concentrated and distributed plasticity beam–column elements were used to model the building frame and several options were considered in constitutive modeling for both options. Incremental dynamic analyses (IDA) were carried out using two suites of ground motions—the first set comprised site-dependent ground motions, while the second set was a compilation of hazard-consistent motions using the conditional scenario spectra approach. Findings from the study highlight the influence of modeling decisions and ground motion selection in the development of seismic collapse fragility functions and the characterization of risk for various demand levels.

脆弱性函数的发展表示建筑物倒塌的可能性，该脆弱性函数是某些地面运动强度度量的函数，是评估结构地震易损性的有效工具。但是，从地面运动选择到建模决策的许多因素都可能影响坍塌概率的量化。进行了系统的研究，以检查构件建模和地面运动选择对确定典型钢筋混凝土框架建筑的需求和倒塌风险的影响。本研究中考虑的主要系统是一栋现代的6层RC矩框架建筑，旨在根据地震活动区中的现行法规进行设计。集中的和分布的可塑性梁柱单元都用于建模建筑框架，本构模型中考虑了两个选项的几个选项。使用两组地面运动进行增量动力分析（IDA）-第一组包括与位置有关的地面运动，而第二组是使用条件情景频谱方法对危害一致的运动进行汇编。这项研究的结果突出了建模决策和地震动选择对地震崩塌脆弱性函数发展以及各种需求水平风险特征的影响。而第二组是使用条件情景光谱方法对危险一致运动的汇编。这项研究的结果突出了建模决策和地震动选择对地震崩塌脆弱性函数发展以及各种需求水平风险特征的影响。而第二组是使用条件情景光谱方法对危险一致运动的汇编。这项研究的结果突出了建模决策和地震动选择对地震崩塌脆弱性函数发展以及各种需求水平风险特征的影响。