Anti-progressive collapse analysis for steel concentrically braced frame under vierendeel action

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (24) : 115-121.

QIAO Huiyun1,2，WEI Jianpeng3，TIAN Limin3

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Abstract

Multi-story frame structures exhibit different anti-collapse mechanisms after key components failed.The Vierendeel action is one of the important anti-progressive collapse mechanisms.The dynamic non-linear analysis considering damage and strain rate was used to simulate column-removal tests by other scholars on multi-story frames, and a theoretical model of the Vierendeel action was proposed.Then, the steel concentrically braced frame commonly used in seismic design was improved, and horizontal bracing was arranged on the top story.Finally, the horizontal bracing system was applied to the Ohio Union building.The results show that the Vierendeel action is the result of the internal forces redistribution among the vertical members, which reflects the overall stress characteristics of the frame structure.The Vierendeel action and other anti-collapse mechanisms together resist the unbalanced load.The top horizontal bracing can significantly reduce the displacement at the failure point, play the role of Vierendeel action, and improve the progressive collapse resistance of the structure.After two middle-column of the Ohio Union building fail, the bracing system transfers most of the gravity of the failed span to the adjacent structure.

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progressive collapse / multi-story frame structure / steel concentrically braced frame / dynamic effect / vierendeel action

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QIAO Huiyun1,2，WEI Jianpeng3，TIAN Limin3. Anti-progressive collapse analysis for steel concentrically braced frame under vierendeel action[J]. Journal of Vibration and Shock, 2019, 38(24): 115-121

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