【摘要】：摘要：大跨度連續(xù)梁橋結(jié)構(gòu)在移動(dòng)荷載作用下動(dòng)力效應(yīng)顯著。本文以酉水大橋?yàn)楸尘?對(duì)大跨度連續(xù)梁橋的車(chē)輛-橋梁耦合時(shí)變系統(tǒng)動(dòng)力響應(yīng)進(jìn)行分析,主要工作如下： 介紹了大跨度連續(xù)梁橋動(dòng)力分析有限元法,建立橋梁結(jié)構(gòu)動(dòng)力分析模型,推導(dǎo)形成橋梁結(jié)構(gòu)的特性矩陣(單元?jiǎng)偠染仃�、單元質(zhì)量矩陣和單元阻尼矩陣)。分析了不同自由度車(chē)輛模型的優(yōu)劣,建立了車(chē)輛移動(dòng)荷載7自由度模型,推導(dǎo)出車(chē)輛空間振動(dòng)總勢(shì)能。闡述了路面不平順?lè)治龇椒?對(duì)所研究橋梁路面不平順做了定量模擬。 根據(jù)彈性系統(tǒng)總勢(shì)能不變值原理和“對(duì)號(hào)入座”法則,建立了車(chē)輛-大跨度連續(xù)梁橋耦合系統(tǒng)動(dòng)力方程。運(yùn)用VBS程序?qū)τ纤髽蜍?chē)輛移動(dòng)荷載動(dòng)力響應(yīng)進(jìn)行了分析,對(duì)比規(guī)范計(jì)算汽車(chē)沖擊系數(shù),并采用狄克曼指標(biāo)對(duì)橋梁振動(dòng)舒適性進(jìn)行評(píng)價(jià)。 對(duì)車(chē)輛-橋梁耦合時(shí)變系統(tǒng)動(dòng)力響應(yīng)參數(shù)進(jìn)行了分析。研究了橋面不平順、車(chē)輛行駛速度、車(chē)輛載重、行車(chē)間距、車(chē)道數(shù)對(duì)酉水大橋動(dòng)力響應(yīng)和狄克曼指標(biāo)橋梁振動(dòng)舒適性的影響以及橋面不平順、車(chē)輛行駛速度、車(chē)輛載重對(duì)車(chē)輛動(dòng)力響應(yīng)和ISO標(biāo)準(zhǔn)、Sperling指標(biāo)車(chē)輛行車(chē)舒適性規(guī)律的影響,得出相關(guān)結(jié)論以供高速公路大跨度連續(xù)梁橋設(shè)計(jì)施工、日常運(yùn)營(yíng)管理參考。
[Abstract]:Abstract: the dynamic effect of long-span continuous beam bridge structure under moving load is remarkable. In this paper, the dynamic response of vehicle-bridge coupling time-varying system of long-span continuous beam bridge is analyzed based on Youshui Bridge. The main work is as follows: the finite element method for dynamic analysis of long-span continuous beam bridge is introduced, the dynamic analysis model of bridge structure is established, and the characteristic matrix of bridge structure (element stiffness matrix, element mass matrix and element damping matrix) is derived. The advantages and disadvantages of vehicle models with different degrees of freedom are analyzed, the 7-degree-of-freedom model of vehicle moving load is established, and the total potential energy of vehicle spatial vibration is derived. This paper expounds the analysis method of pavement irregularity, and makes a quantitative simulation of the pavement irregularity of the studied bridge. According to the principle of invariance of total potential energy of elastic system and the rule of "seat alignment", the dynamic equation of vehicle-long span continuous beam bridge coupling system is established. The dynamic response of the vehicle moving load of Youshui Bridge is analyzed by VBS program, the impact coefficient of the vehicle is calculated by comparing the code, and the vibration comfort of the bridge is evaluated by Dikman index. The dynamic response parameters of vehicle-bridge coupling time-varying system are analyzed. The effects of bridge deck irregularity, vehicle speed, vehicle load, driving distance and lane number on the dynamic response of Youshui Bridge and the vibration comfort of Deckman index bridge, as well as the effects of bridge deck irregularity, vehicle speed, vehicle load on vehicle dynamic response and ISO standard, Sperling index vehicle driving comfort law are studied, and the relevant conclusions are drawn for the design and construction of long-span continuous beam bridge on expressway. Reference for daily operation and management.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U441.3

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本文編號(hào)：2499094