车辆荷载对中小跨径梁式桥地震响应的影响研究

发布时间：2018-04-28 07:55

本文选题：公路桥梁 + 车桥模型　；参考：《西安科技大学》2017年硕士论文

【摘要】：本文通过采用理论分析与数值模拟相结合的方法,研究车辆荷载对桥梁地震响应的影响。文章首先总结和归纳了公路桥梁车桥振动的发展过程,并对其研究现状进行了论述,给出本文研究的主要目的。接着在前人研究的基础上选择并建立了合适的桥梁和汽车分析模型。最后以某高速公路上一座四跨预应力钢筋混凝土连续箱梁桥为例,用有限元分析软件建立整体车桥模型,详细分析了汽车荷载大小、汽车行驶速度、汽车荷载数目、汽车悬挂系统的刚度和阻尼等因素对地震荷载作用下桥梁动力响应的影响。为验证分析模型的准确性,本文分别用ANSYS和MIDAS/Civil有限元分析软件建立桥梁整体模型,然后对其进行动力特性分析,并对两分析结果进行对比。通过对比结果看出,两软件计算的动力特性分析数据较为相似,频率和周期都相差较小,而且振型基本一致,初步验证了计算模型的正确性。接着用ANSYS有限元软件分析汽车荷载对桥梁地震响应的影响,通过对不同地震荷载和不同桥梁跨径模拟分析,可得出如下结论:汽车荷载大小和汽车数量对桥梁地震响应的影响显著,且二者影响较为一致,其影响曲线都是随着变量的增加先减小后增加,即位移曲线随着荷载与数量的增加会出现一最小值;汽车速度对桥梁振动响应的影响在地震作用与非地震作用下是一致的,主梁跨中竖向位移都随汽车行驶速度的增加而逐渐减小;汽车悬挂系统的刚度与阻尼对桥梁地震响应的影响较小,在工程误差范围内可以忽略其影响。
[Abstract]:In this paper, the influence of vehicle loads on the seismic response of bridges is studied by combining theoretical analysis with numerical simulation. In this paper, the development process of vehicle-bridge vibration of highway bridges is summarized, and the present research situation is discussed, and the main purpose of this paper is given. Then, on the basis of previous studies, a suitable bridge and vehicle analysis model is selected and established. Finally, taking a four-span prestressed concrete continuous box girder bridge on a freeway as an example, the integral vehicle-bridge model is established by using finite element analysis software, and the size of the vehicle load, the driving speed of the vehicle, the number of the vehicle load are analyzed in detail. The influence of stiffness and damping of vehicle suspension system on the dynamic response of bridges under earthquake load. In order to verify the accuracy of the analysis model, the whole bridge model is established by ANSYS and MIDAS/Civil finite element analysis software, and the dynamic characteristics of the model are analyzed, and the results of the two analysis are compared. The results show that the dynamic characteristic analysis data of the two softwares are similar, the frequency and period difference is small, and the mode shape is basically the same. The correctness of the calculation model is preliminarily verified. Then the influence of vehicle load on bridge seismic response is analyzed by using ANSYS finite element software, and the different seismic load and bridge span are simulated and analyzed. The following conclusions can be drawn: the influence of vehicle load and vehicle number on the seismic response of bridges is significant, and the influence curves of the two are both decreasing first and then increasing with the increase of variables. That is, the displacement curve will have a minimum value with the increase of load and quantity, and the influence of vehicle speed on the vibration response of bridge is consistent with that of non-seismic action. The vertical displacement decreases with the increase of vehicle speed, and the stiffness and damping of vehicle suspension system have little effect on the bridge seismic response, which can be ignored in the range of engineering error.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3

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