【摘要】：車橋耦合振動是國內(nèi)外學(xué)者研究的一個(gè)熱點(diǎn)問題，在過去的研究中通常忽略橋梁下部結(jié)構(gòu)和支座的彈性影響，將橋梁的支承視為剛性支承。大量的研究成果也表明該簡化方法合理適用。然而，近年來高架橋梁的大量修建和橡膠支座的廣泛應(yīng)用使我們對車橋耦合振動的研究提出了新的問題：采用橡膠支座的高架橋梁的支承彈性效應(yīng)影響大，，研究這類橋梁的車橋耦合振動，仍然將橋梁的邊界條件簡化成剛性是否能夠滿足適用性。圍繞這一問題，本文展開了研究。 本文運(yùn)用大型有限元軟件ANSYS，建立彈性支承梁橋的結(jié)構(gòu)模型，并通過調(diào)節(jié)支座剛度K值，研究其變化對橋梁結(jié)構(gòu)動力特性的影響。利用ANSYS獲得橋梁結(jié)構(gòu)的自振頻率、模態(tài)質(zhì)量、模態(tài)剛度以及橋梁的振型參數(shù)，最后將這些參數(shù)導(dǎo)入到用Fortran語言編制的計(jì)算車橋耦合響應(yīng)的程序中，計(jì)算了彈性支承梁橋在汽車荷載作用下的動力響應(yīng)，并分析了汽車的車速、橋面的平整度和支承的剛度對橋梁動力響應(yīng)的影響。 對彈性支承條件下的簡支梁橋和連續(xù)梁橋作出研究分析后可得到以下結(jié)論： 1、行車速度的變化對橋梁動撓度的影響不大；橋面平整度的不同等級對橋梁響應(yīng)結(jié)果的影響較為明顯。該結(jié)論與在剛性支承條件下所得結(jié)果一致。 2、彈性支承對橋梁在汽車荷載作用下的動力響應(yīng)是有影響的，影響的大小與橋梁支承剛度的取值有關(guān)。當(dāng)支承剛度取值較大時(shí)，彈性支承對動力響應(yīng)的影響較小，將橋梁的邊界條件簡化為剛性仍然適用；當(dāng)支承剛度取值較小時(shí)，彈性支承對動力響應(yīng)的影響較大，將橋梁的邊界條件簡化為剛性將產(chǎn)生較大誤差，應(yīng)當(dāng)考慮支座彈性效應(yīng)的影響。
[Abstract]:The vehicle-bridge coupling vibration is a hot issue studied by scholars at home and abroad. In the past researches, the elastic influence of the bridge understructure and support is usually ignored, and the bridge support is regarded as rigid support. A large number of research results also show that the simplified method is reasonable. However, in recent years, with the extensive construction of elevated bridges and the wide application of rubber bearings, we have put forward a new problem in the study of vehicle-bridge coupling vibration. By studying the vehicle-bridge coupling vibration of this kind of bridge, the boundary condition of the bridge is simplified to whether the rigidity can satisfy the applicability. Around this problem, this article has launched the research. In this paper, the finite element software ANSYSis is used to establish the structural model of the elastic supported beam bridge, and by adjusting the K value of the support stiffness, the influence of the change on the dynamic characteristics of the bridge structure is studied. The natural vibration frequency, modal mass, modal stiffness and modal parameters of bridge structure are obtained by ANSYS. Finally, these parameters are introduced into the program compiled by Fortran language to calculate vehicle-bridge coupling response. The dynamic response of an elastic supported beam bridge under vehicle load is calculated and the effects of vehicle speed, deck smoothness and stiffness on the dynamic response of the bridge are analyzed. Based on the analysis of simply supported beam bridge and continuous beam bridge under the condition of elastic support, the following conclusions can be obtained: 1. The change of driving speed has little effect on the dynamic deflection of bridge; The effect of different grade of deck smoothness on bridge response is obvious. This conclusion is consistent with the results obtained under the condition of rigid support. 2. The elastic support has an effect on the dynamic response of the bridge under the vehicle load, and the magnitude of the influence is related to the value of the bridge support stiffness. When the stiffness of the support is larger, the influence of the elastic support on the dynamic response is small, the boundary condition of the bridge is simplified to rigidity, and when the value of the stiffness of the support is small, the influence of the elastic support on the dynamic response is greater. To simplify the boundary condition of the bridge to rigidity will result in great error, so the effect of bearing elastic effect should be considered.
【學(xué)位授予單位】：暨南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3

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