Research on Mechanism of Overturning Failure for Single-Column Pier Bridge
Research on Mechanism of Overturning Failure for Single-Column Pier Bridge
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DOI：
10.1061/9780784413616.217
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
Weibing Peng;Fei Dai;E. Taciroğlu
中科院分区：
文献类型：
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作者：
Weibing Peng;Fei Dai;E. Taciroğlu
本文对独柱墩桥箱梁在超载和偏载作用下的倾覆破坏机理进行了研究。包括：（1）定义箱梁倾覆前的两个关键状态（即导致不平衡荷载的脱开状态和倾覆稳定的极限状态；（2）倾覆过程中三个阶段（稳定阶段、过渡阶段和倾覆阶段）的描述；（3）建立考虑接触非线性和几何非线性的ABAQUS有限元模型，用于分析春晖桥倒塌；（4）确定各阶段之间关系的工作。结果表明，有限元模拟计算得到的倾覆荷载与春晖桥垮塌现场实测数据相符，反映了该研究的有效性，用倾覆稳定性的极限状态来判断桥梁是否发生倾覆比用一侧端支座的脱离状态来判断更为准确。为旋转极限载荷的1.5-2倍。
This paper presents research on the mechanism of overturning failure on box girder under overload and partial load for the single-column pier bridges. It includes: (1) the definition of two key states before the box girder overturns (i.e., the disengaging state leading to the unbalanced load bearing and the ultimate state of overturning stability; (2) the depiction of three stages along overturning (stable stage, transitional stage, and overturning stage); (3) the development of an ABAQUS finite element model considering contact nonlinear and geometry nonlinear for analyzing Chunhui bridge collapse; and (4) the undertaking on identifying the relationships between overturning ultimate load and elastic modulus of box girder, load position, bridge length and friction coefficient of bearing and box girder. The results indicate that the overturning load calculated by finite element simulation conforms to the measurements collected at the collapse site of Chunhui bridge, reflecting the validity of the proposed study. The ultimate state of the overturning stability can be used to judge whether the bridge is overturning. It is more accurate than using the disengaging state of one side end bearing to judge, and the overturning ultimate load is 1.5-2 times than the rotating ultimate load.