刚构—连续组合梁桥桥墩船撞安全性评价与动力响应研究

发布时间：2018-09-06 09:49

【摘要】：刚构-连续组合梁桥是连续刚构桥与连续梁桥的组合体,通常是由一联桥中的中间孔或中间数孔采用梁墩固结的结构形式组成,它同时具有连续刚构桥与连续梁桥两种桥型的优点而避免了各自的缺点,在大跨径混凝土梁桥的应用中十分广泛。本文以湘府路湘江大桥(65m+5×120m+65m)这一刚构-连续组合梁桥为工程背景,主要研究了刚构-连续组合梁桥桥墩船撞安全性评价相关问题及其在船撞力时程作用下的动力响应特征。本文主要完成了以下工作： 1、以湘府路湘江大桥为工程背景,对刚构-连续组合梁桥桥墩的船撞最不利位置进行了分析研究,研究结果显示,在船撞力作用下整个桥墩中墩底的弯矩最大,且墩底弯矩随着船撞力作用点的升高而增大。 2、介绍了基于我国公路桥涵规范与美国AASHTO指南两种思路对刚构-连续组合梁桥进行桥墩船撞安全性评价的方法,并对湘府路湘江大桥这一工程实例进行了桥墩船撞安全性评价。 3、船撞力数值仿真计算。采用ANSYS/LS-DYNA有限元分析程序建立了一艘92.8m的自航甲板驳船与不同刚性墙的碰撞模型,分析研究了刚性墙宽度与曲率对船舶撞击力的影响,并根据分析结论与工程实例的实际情况建立船舶碰撞模型,计算得到了用于后续船撞动力分析的船撞力时程曲线。 4、刚构-连续组合梁桥在船舶撞击作用下的动力响应特征及其影响因素分析。以湘府路湘江大桥为例,通过Midas civil建立全桥仿真模型,着重分析了两方面内容：其一是动态船撞力对桥墩内力与位移响应的动力放大作用；其二是桥墩刚度、墩顶约束方式、桥梁上部结构质量对桥墩船撞动力计算结果的影响。
[Abstract]:Rigid-frame continuous composite beam bridge is a combination of continuous rigid frame bridge and continuous beam bridge. It has the advantages of continuous rigid frame bridge and continuous beam bridge and avoids their respective disadvantages. It is widely used in long span concrete beam bridge. Taking the Xiangjiang Bridge (65m 5 脳 120m 65m) as the engineering background, this paper mainly studies the problems related to the safety evaluation of the pier of the rigid frame-continuous composite girder bridge and its dynamic response under the action of the ship collision force. The main work of this paper is as follows: 1. Taking Xiangjiang Bridge of Xiangfu Road as the engineering background, the paper analyzes the most unfavorable position of the pier of the rigid-frame continuous composite beam bridge, and the results show that, Under the action of ship collision force, the bending moment at the bottom of the pier is the largest in the whole pier. And the bending moment at the bottom of the pier increases with the increase of the point of application of ship collision force. 2. Based on the highway bridge and culvert code of our country and the AASHTO guide of the United States, the method of evaluating the safety of pier collision of rigid frame continuous composite beam bridge is introduced. The ship collision safety of Xiangjiang Bridge on Xiangfu Road is evaluated. 3. Numerical simulation of ship collision force. The collision model of a 92.8m self-propelled deck barge with different rigid walls is established by using ANSYS/LS-DYNA finite element analysis program. The influence of the width and curvature of rigid wall on the impact force of the ship is analyzed and studied. The ship collision model is established according to the conclusion of the analysis and the actual situation of the engineering example. The time-history curve of ship collision force for subsequent ship collision dynamic analysis is obtained. 4. The dynamic response characteristics of rigid frame-continuous composite beam bridge under ship impact and its influencing factors are analyzed. Taking Xiangjiang River Bridge of Xiangfu Road as an example, the simulation model of the whole bridge is established by Midas civil, and two aspects are emphatically analyzed: one is the dynamic amplification of the dynamic ship collision force on the internal force and displacement response of the pier, the other is the stiffness of the pier and the restraint mode of the pier top. The influence of the superstructure mass of the bridge on the calculation results of the collision force of the pier and the ship.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U443.22

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