Estimation of seismic demands of steel frames subjected to near‐fault earthquakes having forward directivity and comparing with pushover analysis results
Estimation of seismic demands of steel frames subjected to near‐fault earthquakes having forward directivity and comparing with pushover analysis results
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DOI：
10.1002/tal.747
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
F. S. Amiri;G. G. Amiri-G.;H. Razeghi
中科院分区：
文献类型：
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作者：
F. S. Amiri;G. G. Amiri-G.;H. Razeghi
近断层地震作用下现代结构（基于新规范建造的建筑物）的破坏统计数据很高，这说明有必要对此类地震对结构的影响进行更多的研究。近断层地震的一个规范是方向性效应。本文对伊朗和国外已有的含方向性效应的近断层地震记录进行了修正，并将其用于3个钢框架（5层、8层和12层框架）的线性时程分析，并与远断层地震的非线性时程分析和pushover分析结果进行了比较。结果表明，这些记录（近断层）激发了结构的高模态，特别是对于12层结构，检测到高响应，但这些结果都没有导致框架倒塌。通过对非线性动力分析（时程分析）和静力分析（pushover分析）的比较，得出了pushover分析中各种荷载模式不能满足时程分析结果的结论。基于第一振型的荷载分布模式在较低楼层满足这些要求，但在较高楼层，这种方法不适用。版权所有© 2012约翰威利父子有限公司.
High statistics of damages in modern structures (buildings structured based on new codes) exposed to near‐fault earthquake illustrates the necessity of more studies on this kind of earthquake effects on the structures. A specification of near‐fault earthquakes is the directivity effects. Existing records of near‐fault quakes containing directivity effects including records of Iran and abroad were modified and used for linear time history analysis of three steel moment frames (5, 8 and 12 story frames), and the results were compared with nonlinear time history analysis and pushover analysis of far‐fault quakes in this paper. The results showed that these records (near fault) motivate high modes of the structure, and especially for the 12‐story structure, high response was detected, but none of these results made the frames collapse. By comparing nonlinear dynamic analysis (time history) with nonlinear static analysis (pushover), it was concluded that various lateral load patterns in pushover cannot cover the time history result needs. Load distribution pattern based on the first vibration mode covers these demands in the lower floors, but in higher floors, this method is not applicable. Copyright © 2012 John Wiley & Sons, Ltd.