Progressive collapse performance of spatial truss structures subjected to severe earthquakes

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (14) : 231-238.

HAN Qinghua^1,², ZHENG Jingxiao¹, XU Ying^1,3, FU Benzhao¹

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Abstract

Every main shock is usually accompanied by multiple aftershocks during an earthquake. Past earthquake accidents show that the main shock is highly likely to cause initial member failures at the weak positions of a spatial truss structure. Then aftershocks will result in the progressive collapse. For the above problem, incremental dynamic analysis was used to determine the distribution of weak positions of the structure. Then, the initial failure members were introduced by setting predefined fields. Under different failure modes of the structure, the dynamic responses including the failure acceleration, ultimate displacement and yield elements ratio were investigated. Effective measures were proposed to improve the progressive collapse performance of the spatial truss structure. The results show that the weak positions are the upper chords and the lower chords in the midspan of the main truss within the scope of 3/8L, as well as the upper chords of the middle support truss. When the initial failure is introduced, the failure acceleration of the structure decreases by 13.3% to 40.0% and the ultimate displacement decreases by 1.6% to 30.9%. The dynamic instability failure will occur when compression members fail, and the dynamic strength failure will occur when tension members fail. After setting cross diagonal bracings, the failure mode turns to dynamic strength failure and the failure acceleration increases by 69.4% to 73.7%.

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Spatial truss structure / severe earthquake / progressive collapse / predefined field method

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HAN Qinghua1,2, ZHENG Jingxiao1, XU Ying1,3, FU Benzhao1. Progressive collapse performance of spatial truss structures subjected to severe earthquakes[J]. Journal of Vibration and Shock, 2018, 37(14): 231-238

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