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Dynamic analysis of concrete-filled steel tube composite frame against progressive collapse based on benchmark model

Dynamic analysis of concrete-filled steel tube composite frame against progressive collapse based... To provide a unified assessment standard in both seismic analysis and progressive collapse analysis, a benchmark model with joint substructure for concrete-filled steel tube composite frame is developed and studied by alternative path method. The effects of failure period on dynamic response of the model and two types of dynamic increased factor are analyzed. Demand–capacity ratio is used to evaluate the progressive collapse behavior of the model. The results show that beyond 0.5 time of natural vibration period, the failure period has almost no effect on the dynamic response of the model. The peak moment–nominal moment capacity ratio of the beams connected to the removed column indicates that the closer the column gets to side column with pin connections, the more potential it has to trigger collapse. The bending stiffness of beam has little effect on the dynamic response of the model when it is greater than the doubled value. Displacement-based dynamic increased factor in linear static analysis is almost identical to load-based dynamic increased factor in linear static analysis in each case of column removal. Compared with the value of load-based dynamic increased factor, the value of displacement-based dynamic increased factor in nonlinear analysis is closer to the recommended value of 2.0 in GSA. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advances in Structural Engineering SAGE

Dynamic analysis of concrete-filled steel tube composite frame against progressive collapse based on benchmark model

Gao, Shan; Xu, Man; Zhang, Sumei
Advances in Structural Engineering , Volume 21 (7): 15 – May 1, 2018
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References (18)

Publisher
SAGE
Copyright
© The Author(s) 2017
ISSN
1369-4332
eISSN
2048-4011
DOI
10.1177/1369433217737117
Publisher site
See Article on Publisher Site

Abstract

To provide a unified assessment standard in both seismic analysis and progressive collapse analysis, a benchmark model with joint substructure for concrete-filled steel tube composite frame is developed and studied by alternative path method. The effects of failure period on dynamic response of the model and two types of dynamic increased factor are analyzed. Demand–capacity ratio is used to evaluate the progressive collapse behavior of the model. The results show that beyond 0.5 time of natural vibration period, the failure period has almost no effect on the dynamic response of the model. The peak moment–nominal moment capacity ratio of the beams connected to the removed column indicates that the closer the column gets to side column with pin connections, the more potential it has to trigger collapse. The bending stiffness of beam has little effect on the dynamic response of the model when it is greater than the doubled value. Displacement-based dynamic increased factor in linear static analysis is almost identical to load-based dynamic increased factor in linear static analysis in each case of column removal. Compared with the value of load-based dynamic increased factor, the value of displacement-based dynamic increased factor in nonlinear analysis is closer to the recommended value of 2.0 in GSA.

Journal

Advances in Structural Engineering – SAGE

Published: May 1, 2018

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