独柱墩梁桥倾覆破坏机理研究

发布时间：2018-05-02 10:19

本文选题：独柱墩 + 桥梁倾覆　；参考：《自然灾害学报》2014年05期

【摘要】：系统研究了独柱墩梁桥在超载及偏载作用下箱梁发生倾覆破坏的机理,具体包括如下内容:(1)定义了箱梁发生倾覆前的两个关键状态,即一侧端支座脱空状态和倾覆稳定极限状态,并据此进一步定义了箱梁发生倾覆的3个阶段,即稳定阶段、过渡阶段和倾覆阶段;(2)以上虞春晖大桥为背景,建立了考虑接触非线性和几何非线性的ABAQUS有限元模型,确定了桥梁倒塌的两个关键状态所对应的荷载,并进一步研究了倾覆荷载与箱梁弹性模量、加载位置、桥长和支座与箱梁摩擦系数间的关系。研究结果表明:(1)有限元计算得到的倾覆极限荷载与春晖桥现场倒塌实测荷载吻合,表明春晖桥的倒塌源于箱梁首先倾覆,在倾覆过程中桥墩被推倒;(2)倾覆稳定极限状态可以作为判断桥梁是否倾覆的依据,比采用一侧端支座脱空状态判断更加准确,对应的倾覆极限荷载是转动极限荷载的1.5~2倍;(3)独柱墩梁桥的转动和倾覆极限荷载与箱梁的弹性模量、加载位置和桥长有关,而与支座与箱梁间的摩擦系数无关。
[Abstract]:In this paper, the mechanism of overturning failure of single column pier girder bridge under overload and eccentric load is systematically studied, including the following contents: 1) the two key states of box girder before overturning are defined. That is, the empty state of the side end support and the capsizing limit state. Based on this, the three stages of capsizing of the box girder, namely, the stable stage, the transition stage and the capsizing stage, are further defined, with the Shangyu Chunhui Bridge as the background. The ABAQUS finite element model considering contact nonlinearity and geometric nonlinearity is established, and the load corresponding to two key states of bridge collapse is determined, and the overturning load, elastic modulus of box girder and loading position are further studied. The relationship between bridge length and bearing and friction coefficient of box girder. The results show that the overturning limit load calculated by the finite element method is in agreement with the measured load of the site collapse of the Chunhui Bridge, which indicates that the collapse of the Chunhui Bridge originated from the first capsizing of the box girder. The overturning limit state of bridge pier can be used as the basis for judging whether the bridge is overturned or not, and it is more accurate than using the empty state of the side end support to judge whether the bridge is overturned or not. The corresponding capsizing limit load is 1.5 ~ 2 times of the rotational limit load) the rotation and capsizing limit load of a single column pier girder bridge is related to the elastic modulus, loading position and bridge length of the box girder, but not to the friction coefficient between the supports and the box girder.
【作者单位】：浙江工业大学建筑工程学院;宁波市城建设计研究院有限公司;宁波城建投资控股有限公司;
【基金】：国家自然科学基金资助项目(50908211) 浙江省自然科学基金资助项目(LY13E080014) 浙江省省级重点创新团队课题资助项目(2012R10035-12)
【分类号】：U441

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