公路桥梁车桥耦合振动算法校准模型试验研究

发布时间：2018-05-02 13:01

本文选题：车桥耦合振动 + 共振条件　；参考：《昆明理工大学》2017年硕士论文

【摘要】：车桥耦合振动是桥梁结构动力学研究中的重要问题,随着车辆荷载的增加,车致桥梁振动问题日益凸显,是造成桥梁破坏和导致桥梁使用寿命降低主要原因之一。运行的车辆使桥梁结构产生受迫振动,严重时产生共振,久而久之致使桥梁产生疲劳,这对桥梁结构的危害极大。本文归纳了车桥耦合振动的共振条件,来了解车桥系统共振的产生机理。共振条件有:简支梁在移动集中力作用下的共振条件、简支梁在移动荷载列作用下的三种共振条件、车桥耦合振动高阶模态响应、桥梁局部振动共振条件以及车辆共振反应共振条件。以长25.2m宽9.1米的箱形截面简支梁桥为桥梁原型,以双轴载重卡车为车辆原型。几何相似比取SL= 14,运用量纲法推导出相似关系,设计制作了车桥耦合振动试验系统,试验前测定了车辆试验模型和桥梁试验模型的动力特性。进行了车辆静载和车辆动载的模型试验,并记录了桥梁的位移响应峰值和应力响应峰值,来校准DynLab算法。按照车辆试验模型和桥梁试验模型建立数值模型,运用DynLab分析了桥梁在车辆作用下的静载响应和动载响应,并提取了位移响应和应力响应的峰值。将模型试验结果和数值模拟结果进行了对比,得出两者平均偏差百分比,来校准DynLab算法的正确性和可靠性。
[Abstract]:Coupled vibration of vehicle bridge is an important problem in the study of bridge structure dynamics. With the increase of vehicle load, the problem of bridge vibration is becoming increasingly prominent. It is one of the main reasons that cause bridge destruction and reduce bridge service life. The running vehicle causes the bridge structure to produce forced vibration, serious resonance and long time cause bridge. The beam produces fatigue, which has great harm to the bridge structure. This paper sums up the resonance conditions of the bridge coupling vibration to understand the mechanism of the resonance of the bridge system. The resonance condition is the resonance condition of the simple supported beam under the action of the moving concentrated force, the three resonance conditions of the simple supported beam under the action of the moving load column, the high order mode of the coupling vibration of the vehicle bridge. The response, the local vibration resonance condition of the bridge and the resonance condition of the vehicle. The box section simple supported beam bridge with long 25.2m width 9.1 meters is the bridge prototype, the biaxial load truck is the prototype of the vehicle. The geometric similarity ratio is SL= 14, the similarity relation is deduced by the dimension method, and the bridge coupling vibration test system is designed and tested before the test. The dynamic characteristics of the vehicle test model and the bridge test model are carried out. The model test of the vehicle static load and the vehicle dynamic load is carried out, and the peak of the displacement response and the stress response of the bridge are recorded. The DynLab algorithm is calibrated. The numerical model is set up according to the vehicle test model and the bridge test model, and the effect of the bridge in the vehicle is analyzed by DynLab. The displacement response and the peak value of the stress response are extracted. The results of the model test and the numerical simulation are compared, and the average deviation percentage is obtained to calibrate the correctness and reliability of the DynLab algorithm.

【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3

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