Earthquake‐induced loss assessment of steel frame buildings with special moment frames designed in highly seismic regions
Earthquake‐induced loss assessment of steel frame buildings with special moment frames designed in highly seismic regions
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DOI：
10.1002/eqe.2898
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发表时间：
2017-10
影响因子：
4.5
通讯作者：
S. Hwang;D. Lignos
中科院分区：
文献类型：
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作者：
S. Hwang;D. Lignos
本文讨论了一项分析研究，该研究量化了在高震区采用周长特殊弯矩框架设计的典型办公钢框架建筑的预期地震损失。研究表明，对于发生概率较低的地震事件，当预期损失计算基于忽略组合梁效应和钢框架建筑内部重力框架系统的分析模型时，可能会明显高估拆除和倒塌的损失。对于频繁发生的地震事件，建筑物损失主要是由非结构内容修复造成的。在这种情况下，选择钢框架建筑的解析模型表示就变得不那么重要了。与ANSI/AISC‐341‐10中建议的强柱/弱梁比大于2.0的特殊弯矩框架设计的钢框架建筑相比，强柱/弱梁比大于1.0的相同框架设计的钢框架建筑由于拆除和倒塌而造成的损失减少了两倍。具有smf的钢框架建筑的预期年损失（EALs）在建筑预期寿命范围内从0.38%到0.74%不等。EALs主要是对加速度敏感的非结构成分的修复，其次是对漂移敏感的非结构成分的修复。结果表明，强柱/弱梁比对EALs的影响可以忽略不计。当选择生命周期成本的现值作为损失度量时，情况并非如此。建议采用损失指标组合来评估具有特殊矩框架的钢框架建筑的地震引起的损失，这取决于感兴趣的地震性能水平。版权所有©2017 John Wiley & Sons， Ltd
This paper discusses an analytical study that quantifies the expected earthquake‐induced losses in typical office steel frame buildings designed with perimeter special moment frames in highly seismic regions. It is shown that for seismic events associated with low probabilities of occurrence, losses due to demolition and collapse may be significantly overestimated when the expected loss computations are based on analytical models that ignore the composite beam effects and the interior gravity framing system of a steel frame building. For frequently occurring seismic events building losses are dominated by non‐structural content repairs. In this case, the choice of the analytical model representation of the steel frame building becomes less important. Losses due to demolition and collapse in steel frame buildings with special moment frames designed with strong‐column/weak‐beam ratio larger than 2.0 are reduced by a factor of two compared with those in the same frames designed with a strong‐column/weak‐beam ratio larger than 1.0 as recommended in ANSI/AISC‐341‐10. The expected annual losses (EALs) of steel frame buildings with SMFs vary from 0.38% to 0.74% over the building life expectancy. The EALs are dominated by repairs of acceleration‐sensitive non‐structural content followed by repairs of drift‐sensitive non‐structural components. It is found that the effect of strong‐column/weak‐beam ratio on EALs is negligible. This is not the case when the present value of life‐cycle costs is selected as a loss‐metric. It is advisable to employ a combination of loss‐metrics to assess the earthquake‐induced losses in steel frame buildings with special moment frames depending on the seismic performance level of interest. Copyright © 2017 John Wiley & Sons, Ltd.