本文選題：高速鐵路 + 車橋耦合�。� 參考：《天津大學(xué)》2014年碩士論文

【摘要】：車橋耦合計(jì)算方法已經(jīng)成為評(píng)價(jià)橋梁動(dòng)力設(shè)計(jì)參數(shù)合理與否以及列車安全性評(píng)估的重要手段。建立準(zhǔn)確的車橋耦合計(jì)算模型是進(jìn)行車橋耦合計(jì)算的前提和關(guān)鍵。對(duì)于車橋耦合作用而言，其動(dòng)力特性的影響因素除了上部結(jié)構(gòu)外，，樁基系統(tǒng)也是一個(gè)不可忽略的因素。在目前的車橋耦合研究較少考慮樁-土的非線性相互作用。實(shí)際上，在動(dòng)力荷載作用下，樁和土之間存在著變形的相互制約和能量的相互傳遞。因此考慮非線性樁-土相互作用的車橋耦合振動(dòng)成為一個(gè)值得研究的課題。 本文基于土-結(jié)構(gòu)動(dòng)力學(xué)以及車橋耦合理論建立了樁-土-橋-車的動(dòng)力作用分析模型。分析了考慮非線性樁-土相互作用的車橋耦合響應(yīng)，并不考慮樁-土相互作用的車橋耦合響應(yīng)進(jìn)行了對(duì)比分析。其主要研究內(nèi)容如下： 1.基于文克爾地基梁理論，利用修正的P-Y曲線法和荷載傳遞雙曲線法，模擬樁-土水平方向和豎直方向的非線性相互作用。采用了樁和土相對(duì)剛度來計(jì)算水平方向樁-土相互作用的初始剛度。通過Mohr-Coulomb法則得到土的極限抗力，并結(jié)合Matlock P-Y曲線法對(duì)極限抗力的表達(dá)式進(jìn)行了修正，充分考慮了土的極限抗力的深度效應(yīng)。從而建立了非線性樁-土相互作用模型。并分析樁基各主要參數(shù)對(duì)樁基承載力的影響。 2.針對(duì)包含31個(gè)自由度的二系懸掛四軸動(dòng)車模型，包含12個(gè)自由度的空間梁單元橋梁動(dòng)力學(xué)模型，以及建立的非線性樁-土相互作用模型，建立了樁-土-橋-車體系動(dòng)力學(xué)模型。為提高樁-土-橋-車動(dòng)力體系振動(dòng)微分方程的求解速度，采用了“新型顯式Newmark-β”法與傳統(tǒng)隱式“Newmark-β”法分別求解車輛動(dòng)力方程和橋梁（包含樁-土）的動(dòng)力方程。 3.以某一位于深厚軟弱場地的高速鐵路橋梁為背景，建立了包含非線性樁-土相互作用的車-橋耦合有限元模型。在此基礎(chǔ)上對(duì)該高速鐵路橋梁振動(dòng)特性以及高速列車在其上運(yùn)行的安全性能進(jìn)行了分析。發(fā)現(xiàn)考慮非線性樁-土相互作用后橋梁振動(dòng)的位移響應(yīng)變大，加速度響應(yīng)變小。非線性樁-土相互作用對(duì)車輛的安全性能有利。此計(jì)算方法和結(jié)果為軟弱基礎(chǔ)的高速鐵路線路的分析和設(shè)計(jì)提供了參數(shù)和依據(jù)。
[Abstract]:The vehicle-bridge coupling calculation method has become an important means to evaluate whether the bridge dynamic design parameters are reasonable or not and the train safety evaluation. The establishment of accurate vehicle-bridge coupling calculation model is the premise and key of vehicle-bridge coupling calculation. As far as vehicle-bridge coupling is concerned, the influence factor of its dynamic characteristics is not only the superstructure, but also the pile foundation system can not be ignored. In the current vehicle-bridge coupling research, the pile-soil nonlinear interaction is seldom considered. In fact, under the action of dynamic load, there are mutual constraints of deformation and energy transfer between pile and soil. Therefore, the vehicle-bridge coupling vibration considering nonlinear pile-soil interaction becomes a subject worth studying. Based on soil-structure dynamics and vehicle-bridge coupling theory, a dynamic model of pile-soil-bridge-vehicle is established in this paper. The vehicle-bridge coupling response considering nonlinear pile-soil interaction is analyzed, and the vehicle-bridge coupling response without considering pile-soil interaction is compared. The main research contents are as follows: 1. Based on Winkler's foundation beam theory, the modified P-Y curve method and the load transfer hyperbolic method are used to simulate the nonlinear interaction between the horizontal direction and vertical direction of pile-soil. The initial stiffness of pile-soil interaction in horizontal direction is calculated by using the relative stiffness of pile and soil. The limit resistance of soil is obtained by Mohr-Coulomb rule, and the expression of limit resistance is modified by Matlock P-Y curve method. The depth effect of ultimate resistance of soil is fully considered. A nonlinear pile-soil interaction model is established. The influence of the main parameters of pile foundation on the bearing capacity of pile foundation is analyzed. 2. Aiming at the two-system suspension four-axis motor vehicle model with 31 degrees of freedom, the dynamic model of spatial beam element bridge with 12 degrees of freedom, and the nonlinear pile-soil interaction model, a nonlinear pile-soil interaction model is established. The dynamic model of pile-soil-bridge-vehicle system is established. In order to improve the speed of solving the vibration differential equation of pile-soil-bridge-vehicle dynamic system, the "new explicit Newmark- 尾" method and the traditional implicit "Newmark- 尾" method are used to solve the vehicle dynamic equation and the bridge (including pile-soil) dynamic equation respectively. 3. A vehicle-bridge coupling finite element model including nonlinear pile-soil interaction is established based on a high-speed railway bridge located in a deep weak site. On this basis, the vibration characteristics of the high-speed railway bridge and the safety performance of the high-speed train running on the bridge are analyzed. It is found that the displacement response of bridge vibration becomes larger and the acceleration response is smaller when nonlinear pile-soil interaction is considered. Nonlinear pile-soil interaction is beneficial to vehicle safety performance. The calculation method and results provide parameters and basis for the analysis and design of high-speed railway lines with weak foundation.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.3;U211.3

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