【摘要】：剛構(gòu)-連續(xù)組合梁橋是連續(xù)剛構(gòu)橋與連續(xù)梁橋的組合體,通常是由一聯(lián)橋中的中間孔或中間數(shù)孔采用梁墩固結(jié)的結(jié)構(gòu)形式組成,它同時具有連續(xù)剛構(gòu)橋與連續(xù)梁橋兩種橋型的優(yōu)點而避免了各自的缺點,在大跨徑混凝土梁橋的應(yīng)用中十分廣泛。本文以湘府路湘江大橋(65m+5×120m+65m)這一剛構(gòu)-連續(xù)組合梁橋為工程背景,主要研究了剛構(gòu)-連續(xù)組合梁橋橋墩船撞安全性評價相關(guān)問題及其在船撞力時程作用下的動力響應(yīng)特征。本文主要完成了以下工作： 1、以湘府路湘江大橋為工程背景,對剛構(gòu)-連續(xù)組合梁橋橋墩的船撞最不利位置進行了分析研究,研究結(jié)果顯示,在船撞力作用下整個橋墩中墩底的彎矩最大,且墩底彎矩隨著船撞力作用點的升高而增大。 2、介紹了基于我國公路橋涵規(guī)范與美國AASHTO指南兩種思路對剛構(gòu)-連續(xù)組合梁橋進行橋墩船撞安全性評價的方法,并對湘府路湘江大橋這一工程實例進行了橋墩船撞安全性評價。 3、船撞力數(shù)值仿真計算。采用ANSYS/LS-DYNA有限元分析程序建立了一艘92.8m的自航甲板駁船與不同剛性墻的碰撞模型,分析研究了剛性墻寬度與曲率對船舶撞擊力的影響,并根據(jù)分析結(jié)論與工程實例的實際情況建立船舶碰撞模型,計算得到了用于后續(xù)船撞動力分析的船撞力時程曲線。 4、剛構(gòu)-連續(xù)組合梁橋在船舶撞擊作用下的動力響應(yīng)特征及其影響因素分析。以湘府路湘江大橋為例,通過Midas civil建立全橋仿真模型,著重分析了兩方面內(nèi)容：其一是動態(tài)船撞力對橋墩內(nèi)力與位移響應(yīng)的動力放大作用；其二是橋墩剛度、墩頂約束方式、橋梁上部結(jié)構(gòu)質(zhì)量對橋墩船撞動力計算結(jié)果的影響。
[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.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3;U443.22

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本文編號：2225968