强震作用下立体桁架结构抗连续倒塌性能研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (14) : 231-238.

论文

韩庆华1,2 郑靖潇1 徐颖1,3, 傅本钊1

作者信息 +

Progressive collapse performance of spatial truss structures subjected to severe earthquakes

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

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摘要

地震灾害发生时，主震之后通常伴有多次余震。以往的震害事故表明，主震过程可能引起立体桁架结构薄弱部位发生初始失效，并导致结构在余震中发生连续倒塌破坏。针对以上问题，本文首先采用增量动力法确定立体桁架结构薄弱部分分布规律，然后采用预定义场法引入初始失效杆件，分析不同破坏模式下该类结构破坏加速度、倒塌极限位移和塑性杆件比例等响应的变化规律，最后提出了改善结构抗连续倒塌性能的有效措施。分析结果表明：在强震作用下立体桁架结构的薄弱部位为主桁架跨中3/8L范围内的上弦杆、下弦杆及跨中支撑桁架的上弦杆。引入初始失效后结构破坏加速度降低了13.3~40.0%，倒塌极限位移降低了1.6~30.9%。当初始失效杆件为受压杆件时，结构产生动力失稳破坏；当初始失效杆件为受拉杆件时，结构产生动力强度破坏。针对发生动力失稳破坏的立体桁架结构，增加侧向交叉支撑使破坏模式转变成动力强度破坏，破坏加速度提高69.4~73.7%。

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%.

关键词

立体桁架结构

/ 强震作用 / 连续倒塌 / 预定义场法

Key words

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

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韩庆华1,2 郑靖潇1 徐颖1,3, 傅本钊1. 强震作用下立体桁架结构抗连续倒塌性能研究[J]. 振动与冲击, 2018, 37(14): 231-238

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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