滚石碰撞下桥墩动力响应分析及试验研究

发布时间：2018-06-27 08:24

本文选题：滚石 + 桥墩　；参考：《重庆交通大学》2015年硕士论文

【摘要】：鉴于近年来我国频频发生桥梁受滚石撞击的事故,造成的人员伤亡、财产损失以及环境破坏是不可估量。而《公路桥涵公用设计规范》对于山区桥梁受滚石撞击这种偶然作用并未给出一定的设计建议。且我国的《铁路隧道设计规范》和《公路隧道设计规范》中虽然提及了有关明洞和棚洞设计荷载有关经验计算参照方法,但没有给出滚石的计算力公式。由此可见,对于滚石灾害目前在我国公路桥梁领域并未受到重视。正是基于以上背景,本文做了以下主要研究内容:①利用相似理论分析了缩尺试验构件尺寸和使用的材料,进行缩尺滚石—桥墩试验研究,分析桥墩在撞击过程中桥墩的动力响应的及出现的损伤形态,从试验角度反映桥梁下部结构受到外部碰撞力出现的动力响应和响应过程以及研究桥墩损伤破坏的影响因素。②对数值模拟中常用的动力作用下的混凝土材料模型进行了详细的介绍和比较,并通过建立有限元模型,分析比较了盖帽模型、HJC模型和线弹性三种常用的材料模型的计算结果,最终选择了HJC材料模型作为本文建模中混凝土的材料模型。③通过建立滚石和桥墩有限元模型,仿真分析桥墩在滚石撞击下整个动态过程,获取动力响应的几个指标:撞击力时程曲线、桥墩位移时程曲线、加速度时程曲线、桥墩应力时程曲线以及桥墩损伤情况。④分析影响桥墩损伤的主要因素,研究滚石形状对桥墩破坏形态的影响,研究从局部损伤开展到整体破坏的演化过程,分析桥墩局部损伤与整体破坏之间的联系。
[Abstract]:In view of the frequent accidents caused by rolling stones in China in recent years, the casualties, property losses and environmental damage caused by the accidents are inestimable. However, the Code for the Design of Highway Bridges and culverts has not given some design suggestions for the accidental action of rolling stones on bridges in mountainous areas. In our country's Railway Tunnel Design Code and Highway Tunnel Design Code, although the empirical calculation reference method related to the design load of open tunnel and shed tunnel is mentioned, the calculation force formula of rolling stone is not given. It can be seen that the rolling stone disaster has not been paid attention to in the field of highway and bridge in our country. Based on the above background, this paper does the following main research contents: 1. By using the similarity theory, the dimensions and materials of the scale test members are analyzed, and the scale rolling stone pier test research is carried out. The dynamic response and damage pattern of pier during impact are analyzed. From the point of view of test, the dynamic response and response process of bridge understructure subjected to external impact force are reflected, and the influencing factors of damage and failure of pier are studied. 2. 2. Concrete material modulus under the common dynamic action in numerical simulation. Type B is introduced and compared in detail. By establishing the finite element model, the calculation results of the HJC model and the linear elastic model are analyzed and compared. Finally, HJC material model is chosen as the material model of concrete in this paper. 3. By establishing the finite element model of rolling stone and bridge pier, the whole dynamic process of bridge pier under the impact of rolling stone is simulated and analyzed. Several indexes of dynamic response are obtained: impact force time-history curve, pier displacement time-history curve, acceleration time-history curve, pier stress time-history curve and pier damage situation. 4. The main factors affecting pier damage are analyzed. This paper studies the influence of rolling stone shape on the failure pattern of bridge pier, studies the evolution process from local damage to global failure, and analyzes the relationship between local damage and global failure of bridge pier.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.22;U441.3

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