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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Effective periods and seismic performance of steel moment resisting frames designed for risk categories I and IV according to IBC2009
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Effective periods and seismic performance of steel moment resisting frames designed for risk categories I and IV according to IBC2009

机译：根据IBC2009为风险类别I和IV设计的抗弯矩钢框架的有效期和抗震性能

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摘要

In current seismic design, structures that are essential for post-disaster recovery, and hazardous facilities are classified as risk category IV and are designed with higher importance factors and stringent drift limits. These structures are expected to perform better in an earthquake event because a larger base shear and more stringent drift limit are used. Although this provision has been in the seismic design code over the last three decades, few studies have investigated the performance of essential structures. The aim of this study is to quantify the impact of higher importance factors and stringent drift limits on the seismic performance of steel moment resisting frames. A total of 16 steel structures are designed for Los Angeles and Seattle. Different risk categories are used for the design. The effects of the risk categories on the structural periods, and thus on the seismic force demand, are investigated. A suite of inelastic time history analyses are carried out to understand the probability of exceeding a specified limit state when the structures are subjected to different levels of earthquake events. The results show that the periods of the structures in risk category IV decrease by a factor of 0.5 to 0.8, and the strengths increase by a factor of 1.5 to 3.2. Seismic fragility analysis shows that the structures in risk category IV generally satisfy the probabilistic performance objectives. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：在当前的地震设计中，对于灾后恢复必不可少的结构和危险设施被归为IV类风险，并且设计时具有更高的重要性因子和严格的漂移限制。由于使用了更大的基础剪切力和更严格的漂移极限，这些结构有望在地震中表现更好。尽管在过去的三十年中，这项规定已列入抗震设计规范中，但很少有研究调查基本结构的性能。这项研究的目的是量化较高的重要因素和严格的漂移极限对抗弯矩框架抗震性能的影响。洛杉矶和西雅图总共设计了16种钢结构。设计使用了不同的风险类别。研究了风险类别对结构周期的影响，进而对地震力需求的影响。进行了一系列非弹性时程分析，以了解当结构经受不同级别的地震事件时超过指定极限状态的可能性。结果表明，风险类别IV中的结构的周期减少了0.5到0.8倍，强度增加了1.5到3.2倍。地震脆性分析表明，风险类别IV中的结构通常满足概率性能目标。版权所有（c）2014 John Wiley＆Sons，Ltd.

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