本文關(guān)鍵詞：剎車行為對(duì)大跨度懸索橋的振動(dòng)分析　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 有限元 懸索橋 耦合振動(dòng) 路面不平整 制動(dòng)力

【摘要】：國(guó)民經(jīng)濟(jì)的飛速發(fā)展促使了客運(yùn)與貨運(yùn)量日趨增長(zhǎng),高速路網(wǎng)的全面覆蓋使得行車速度、車流密度和載重量都有大幅度的提高，國(guó)家積極推廣使用新型高強(qiáng)材料使得橋梁結(jié)構(gòu)的設(shè)計(jì)與施工正朝著更大、更細(xì)、更柔的方向發(fā)展。車輛因交通事故，惡劣天氣等原因而突然剎車的現(xiàn)象時(shí)有發(fā)生，上述四個(gè)方面的原因造成了制動(dòng)力對(duì)懸索橋的振動(dòng)效應(yīng)變得更加明顯。因此，揭示車橋振動(dòng)機(jī)理，展開制動(dòng)力對(duì)懸索橋的振動(dòng)分析，對(duì)懸索橋的設(shè)計(jì)、建設(shè)、維護(hù)工作都具有極為重要的理論意義。 回顧前人做出的努力，可見車-橋耦合動(dòng)力學(xué)問題已取得了豐碩的研究成果�；跁r(shí)域的車橋耦合振動(dòng)分析方法是比較常用的方法，按照求解過程大致可以分為三大類： ①分離迭代法，力學(xué)概念明確，分開求解車輛橋方程，避免了車輛和橋梁兩個(gè)振動(dòng)方程之間復(fù)雜耦合關(guān)系的處理，但是可能存在迭代不收斂的情況。 ②約束方程分析法，以通用有限元軟件為工具，直接建立車輛和橋梁模型，分析計(jì)算時(shí)只需改變車橋耦合點(diǎn)，但Rayleigh阻尼中多考慮了車輛的質(zhì)量和剛度矩陣的參與，計(jì)算結(jié)果存在偏差。 ③聯(lián)合方程分析法，消除了約束方程分析法中阻尼考慮不準(zhǔn)確的影響，將車橋平衡方程進(jìn)行解耦，直接整體求解，但計(jì)算之前需要處理車輛和橋梁之間復(fù)雜的耦合關(guān)系，對(duì)于空間車橋耦合振動(dòng)問題的分析，難度較大。 在前人的研究成果基礎(chǔ)上，結(jié)合青草背長(zhǎng)江大橋進(jìn)行了如下工作： ①車輛采用7自由度平面分析模型，利用D.Alembert原理推導(dǎo)車輛動(dòng)力平衡方程，，橋梁則直接利用Ansys建立有限元分析模型，車橋耦合效應(yīng)通過車輪與橋面接觸點(diǎn)的幾何條件和靜力平衡條件來聯(lián)系。 ②利用Runge-Kutta法在Ansys中編寫車輛動(dòng)力平衡方程求解程序，擬定合理的時(shí)間積分步長(zhǎng)，采用Ansys的瞬態(tài)動(dòng)力學(xué)求解器求解橋梁方程。根據(jù)現(xiàn)有文獻(xiàn)算例，驗(yàn)證計(jì)算程序的正確性。 ③結(jié)合04規(guī)范與89規(guī)范荷載的特點(diǎn)，采用靜力等效計(jì)算原則，確定車流分布情況，利用諧波合成法對(duì)路面不平整進(jìn)行模擬。 ④對(duì)實(shí)例工程青草背長(zhǎng)江大橋進(jìn)行車橋耦合分析計(jì)算，分析行車速度，橋面不平順，剎車制動(dòng)三種因素影響下的動(dòng)力響應(yīng)。
[Abstract]:With the rapid development of the national economy, the passenger and freight traffic volume is increasing day by day, and the overall coverage of the highway network makes the speed, traffic density and load weight greatly increased. The country actively promotes the use of new high-strength materials to make the design and construction of bridge structures moving towards a larger, finer and softer direction. The phenomenon of sudden braking occurs from time to time due to bad weather and other reasons. The above four reasons cause the vibration effect of braking force to the suspension bridge become more obvious. Therefore, the vibration mechanism of vehicle and bridge is revealed. It is of great theoretical significance for the design, construction and maintenance of suspension bridge to carry out the vibration analysis of suspension bridge with braking force. Looking back on the previous efforts, we can see that the vehicle-bridge coupling dynamics problem has made a lot of research results. The time-domain vehicle-bridge coupling vibration analysis method is a more common method. According to the solution process, it can be divided into three categories: 1. The separation iteration method, the mechanics concept is clear, solves the vehicle bridge equation separately, avoids the complex coupling relation processing between the vehicle and the bridge two vibration equations, but may have the iteration not to converge the situation. (2) the constraint equation analysis method, with the general finite element software as the tool, establishes the vehicle and the bridge model directly, only needs to change the vehicle-bridge coupling point in the analysis calculation. However, the mass and stiffness matrix of the vehicle are often considered in the Rayleigh damping, and the calculation results are deviated. (3) the joint equation analysis method eliminates the influence of inaccurate damping consideration in the constraint equation analysis method, and decouples the vehicle-bridge equilibrium equation and solves it directly as a whole. But it is necessary to deal with the complicated coupling relationship between vehicle and bridge before calculation, so it is difficult to analyze the coupling vibration of space vehicle-bridge. On the basis of the previous research results, the following work has been done in combination with the Qingcao back Yangtze River Bridge: (1) the vehicle adopts the plane analysis model of 7 degrees of freedom, the dynamic equilibrium equation of the vehicle is derived by the D. Alembert principle, and the finite element analysis model of the bridge is established directly by using Ansys. The coupling effect of vehicle and bridge is connected by the geometric condition and static equilibrium condition of the contact point between the wheel and the bridge deck. (2) the Runge-Kutta method is used to program the solution of vehicle dynamic balance equation in Ansys, and the reasonable time integral step is worked out. The transient dynamic solver of Ansys is used to solve the bridge equation. (3) combined with the characteristics of load in Code 04 and Code 89, the distribution of vehicle flow is determined by using the principle of static equivalent calculation, and the uneven road surface is simulated by harmonic synthesis method. (4) the vehicle-bridge coupling analysis of Qingcaobei Yangtze River Bridge is carried out, and the dynamic response under the influence of driving speed, uneven deck and brake braking is analyzed.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.3

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本文編號(hào)：1415514