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Quantitative investigation on collapse margin of steel high-rise buildings subjected to extremely severe earthquakes

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Earthquake Engineering and Engineering Vibration 2018年第3期17卷 445-457页

作者： Lin Xuchuan Mikiko Kato Zhang Lingxin Masayoshi Nakashima Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbinChina Nikken Sekkei LTD. OsakaJapan Kyoto University KyotoJapan Kobori Research Complex TokyoJapan

Reponses of structures subjected to severe earthquakes sometimes significantly surpass what was considered in the *** is important to investigate the failure mechanism and collapse margin of structures beyond design,especially for high-rise *** this study,steel high-rise buildings using either square concrete-filled-tube（CFT） columns or steel tube columns are designed.A detailed three-dimensional（3 D） structural model is developed to analyze the seismic behavior of a steel high-rise towards a complete *** effectiveness is verified by both component tests and a full-scale shaking table *** collapse margin,which is defined as the ratio of PGA between the collapse level to the design major earthquake level（Level 2）,is quantified by a series of numerical simulations using incremental dynamic analyses（IDA）.The baseline building using CFT columns collapsed with a weak first story mechanism and presented a collapse margin ranging from 10 to *** significant variation in the collapse margin was caused by the different characteristics of the input ground *** building using equivalent steel columns collapsed earlier due to the significant shortening of the locally buckled columns,exhibiting only 57% of the collapse margin of the baseline *** influence of reducing the height of the first story was quite *** shortened first story not only enlarged the collapse margin by 20%,but also changed the collapse mode.

关键词： collapse quantification steel high-rise building numerical models local buckling collapse mechanism

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