动力荷载和桥台后填土共同作用对桥台受力的影响分析

发布时间：2018-06-13 16:07

本文选题：桥头跳车 + U型桥台　；参考：《贵州大学》2015年硕士论文

【摘要】：近年以来,公路交通在运营过程出现大量的桥头跳车现象,这不仅对车辆运行造成很大障碍,而且对桥台的损坏也很严重。目前的桥台大多数为重力式U型桥台,故研究此类型桥台在跳车情况下产生的动力荷载和台后填土压力对桥台的影响很有必要。本文叙述目前U型桥台出现的一些常见病害现象以及U型桥台的结构类型和组成部分。通过概述当前桥台受力分析研究的成果,指出了未考虑桥头跳车所产生的动力荷载对桥台的影响。在深入分析桥头跳车的本质的基础上,从跳车的危害、原因以及防治建议三个方面阐述跳车问题。其中着重论述了台后填料与地基处理、过渡段设置和路桥整体设计三个方面提出跳车的防治建议。然后,讲述台背土压力以及路面动力荷载的计算理论。通过当前多种方法的对比分析可知,土压力计算采用库仑土压力理论比较合适,跳车情况下的车辆动力荷载,运用考虑车轮轨迹模型的研究成果更加符合实际情况。同时,概述了岩土工程特点、有限元原理、MIDAS/GTS的应用、工程概况和参数的选取,尤其对动力荷载的加载方式做了详细的讲解。采用MIDAS/GTS进行U型桥台建模及无路面荷载、无跳车、10mm跳车、20mm跳车、30mm跳车等多种工况下的有限元计算结果分析,通过对不同工况的桥台结构的第一主应力和顺桥向、横桥向位移对比分析,得出了本课题的研究结果。并且将实测位移数据和模型计算结果比对分析,证实MIDAS/GTS建模及计算的合理。
[Abstract]:In recent years, there are a large number of bridge-head jumping phenomena in the operation of highway traffic, which not only cause great obstacles to vehicle operation, but also cause serious damage to abutment. Most of the abutments are gravity U-abutments at present, so it is necessary to study the influence of dynamic load on abutment caused by jumping abutment and the earth pressure behind abutment. This paper describes some common diseases of U-abutment and the structural types and components of U-abutment. By summarizing the current research results of abutment force analysis, it is pointed out that the influence of dynamic load on abutment caused by jump at bridge head is not considered. On the basis of deeply analyzing the essence of bridgehead jumping, the paper expounds the problem of jumping from three aspects: harm, reason and prevention and cure. The paper mainly discusses the prevention and treatment of the backfill and foundation, the setting of the transition section and the whole design of the road and bridge, and puts forward some suggestions for the prevention and cure of the jump. Then, the calculation theory of the earth pressure on the back of the abutment and the dynamic load on the pavement is discussed. Through the comparison and analysis of various methods, it can be seen that the Coulomb earth pressure theory is suitable for the calculation of earth pressure, and the vehicle dynamic load in the case of vehicle jumping is more suitable, and the application of the research results considering the wheel trajectory model is more in line with the actual situation. At the same time, the characteristics of geotechnical engineering, the application of finite element theory and Midas / GTS, the general situation of engineering and the selection of parameters are summarized, especially the loading mode of dynamic load is explained in detail. Using Midas / GTS to model U-type abutment and without road load, the finite element calculation results under various working conditions, such as 10mm or 10mm, 20mm, 30mm and so on, are analyzed. The first principal stress of abutment structure under different working conditions and the direction of the bridge are analyzed. Based on the comparative analysis of transverse bridge displacement, the research results of this subject are obtained. By comparing the measured displacement data with the calculated results, it is proved that the MIDAS-GTS model and calculation are reasonable.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

【参考文献】