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Proposed methodology for building-specific earthquake loss assessment including column residual axial shortening

机译：建筑物特定地震损失评估的拟议方法，包括圆柱残余轴向缩短

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摘要

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.
机译：本文提出了一些方法学方面的发展方法，以量化第一层钢柱的残余轴向缩短对抗弯框架（MRF）建筑中地震损失估计的影响。提出了一种新的公式，该公式考虑了除了残余的楼层-漂移比之外，还由于柱的残余轴向变形而必须拆除钢制MRF建筑的可能性。通过在全球范围内进行的一项全面调查得出的数据来评估配方，以评估由于残余轴向缩短而导致的钢柱可修复性的可能性。提出了在参数化系统级数值模拟中量化柱轴向缩短的实用方法。通过根据目前的地震设计实践，在加利福尼亚市区设计的两座案例研究钢制MRF建筑物中进行经济地震损失估算，从而说明了所提出的方法。结果发现，当地震动持续时间可观时，在中等至高地震烈度下，所检查的钢MRF较残余层间漂移更容易发生柱轴向缩短。结果表明，如果损失估算中忽略了立柱残余轴向缩短，则由于拆除而造成的经济损失可能会被低估。讨论了局限性和未来研究的方向。

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