Progressive collapse analysis and mechanism study for multi-story frame structures with&nbsp; middle-column demolition

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (22) : 136-143.

Progressive collapse analysis and mechanism study for multi-story frame structures with middle-column demolition

QIAO Huiyun,YANG Yinghua,ZHONG Weihui

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Abstract

Multi-story frame structures are often simplified as single-story substructures to study their progressive collapse resistance, in which a single-story substructure is studied and its behavior is applied to multi-story frame analysis.However, due to ignoring the effect of the vierendeel mechanism, the current simplified model could not fully reflect the mechanical behaviors of the whole structure.Based on a double-span beam model, the collapse mechanism of the single-story substructure was studied, and a resistance calculation method for the beam mechanism and catenary mechanism was proposed, which was then validated by numerical examples.To analyze the effect of the vierendeel mechanism on the overall behavior of multi-story frames, a top-floor substructure model was established, and the contribution index of the vierendeel mechanism against the progressive collapse was introduced.Incorporating with the above models, the process of demolishing four columns of the Ohio Union building was simulated.The results show that the simplified models are reasonable.The top and bottom stories of the multi-story frame show different anti-collapse mechanism, and the vierendeel mechanism together with other mechanisms resist the unbalanced load.At the same time, it is found that the Ohio Union building has good resistance to progressive collapse.

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progressive collapse / multi-story frame structure / beam mechanism / catenary mechanism / vierendeel mechanism;

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QIAO Huiyun,YANG Yinghua,ZHONG Weihui. Progressive collapse analysis and mechanism study for multi-story frame structures with middle-column demolition[J]. Journal of Vibration and Shock, 2018, 37(22): 136-143

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