This paper proposes methodological developments for quantifying the impact of residual axial shortening of first‐story steel columns on earthquake loss estimations in steel moment‐resisting frame (MRF) buildings. A new formulation is proposed that accounts for the likelihood of having to demolish a steel MRF building due to column residual axial deformations in addition to residual story‐drift ratios. The formulation is informed by means of data from a comprehensive survey conducted worldwide to assess the likelihood of steel column repairability due to residual axial shortening. A practical method for quantifying column axial‐shortening in parameterized system‐level numerical simulations is presented. The proposed approach is illustrated by conducting economic seismic loss estimations in two case‐study steel MRF buildings designed in urban California according to the current seismic design practice. It is found that when the ground‐motion duration is appreciable, the examined steel MRFs are more prone to column axial‐shortening than residual story‐drifts at moderate to high seismic intensities. The results suggest that economic losses due to demolition may be underestimated if column residual axial‐shortening is neglected from loss estimations. Limitations as well as directions for future research are discussed.

中文翻译：

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包括柱残余轴向缩短在内的建筑物特定地震损失评估的建议方法

本文提出了量化第一层钢柱残余轴向缩短对钢结构抗弯框架 (MRF) 建筑地震损失估计的影响的方法论发展。提出了一种新的公式，该公式考虑了由于柱残余轴向变形以及残余层间位移比而不得不拆除钢制 MRF 建筑物的可能性。该配方是通过在全球范围内进行的一项综合调查的数据得出的，以评估由于残余轴向缩短导致钢柱可修复的可能性。提出了一种在参数化系统级数值模拟中量化柱轴缩短的实用方法。根据当前的抗震设计实践，通过在加利福尼亚城市设计的两个案例研究钢 MRF 建筑中进行经济地震损失估计来说明所提出的方法。结果表明，当地震动持续时间可观时，在中等至高地震强度下，所检查的钢 MRF 比残余层间位移更容易发生柱轴缩短。结果表明，如果在损失估计中忽略了柱子残余轴向缩短，则可能会低估由于拆除造成的经济损失。讨论了未来研究的局限性和方向。在中等至高地震强度下，所检查的钢 MRF 比残余层间位移更容易发生柱轴向缩短。结果表明，如果在损失估计中忽略了柱子残余轴向缩短，则可能会低估由于拆除造成的经济损失。讨论了未来研究的局限性和方向。在中等至高地震强度下，所检查的钢 MRF 比残余层间位移更容易发生柱轴向缩短。结果表明，如果在损失估计中忽略了柱子残余轴向缩短，则可能会低估由于拆除造成的经济损失。讨论了未来研究的局限性和方向。