空心板梁桥拓宽及纵缝特性参数分析

发布时间：2018-05-19 02:08

本文选题：拓宽 + 空心板梁桥　；参考：《重庆交通大学》2016年硕士论文

【摘要】：空心板梁桥的拓宽在桥梁拓宽改造工程中占有很大的比重,由于拓宽后新旧桥结构刚度的差异性,造成新旧桥结合部位变形和新旧桥相对变形差异很大,容易引起桥面铺装和纵缝裂缝的开展,影响行车舒适性和安全性,因而对空心板梁旧桥拓宽中新旧桥的连接纵缝进行研究是必要的。本文根据国内外桥梁拓宽经验和发展情况,总结了空心板梁桥的结构形式、拓宽原则和连接方式、梁格法以及荷载横向分布的计算。本文的主要内容如下:1通过缩尺模型试验对装配式简支空心板梁桥拓宽进行研究,分析了空心板梁桥拓宽前后旧桥挠度和荷载横向分布所受到的影响。2运用有限元的方法,建立了拓宽前和拓宽后桥梁的计算模型,得出其荷载横向分布规律,在误差允许的范围内与试验的整体趋势是一致的,并可将该计算模型应用到后面的参数分析中。(3)在有限元的基础上,运用参数分析的方法,讨论了纵缝聚合物混凝土高度、宽度和弹性模量变化时对拓宽后桥梁纵缝受力及其跨中荷载横向分布的影响。(4)分析新桥沉降的变化对拓宽后桥梁纵缝横向受力的影响,并提出要求控制的沉降量。
[Abstract]:The widening of hollow slab girder bridge occupies a large proportion in the bridge widening and rebuilding project. Due to the difference of structural stiffness of the new and old bridges after widening, the deformation of the new and old bridges combined with the old bridge and the relative deformation of the new and old bridges are very different. It is easy to cause bridge deck pavement and longitudinal crack development, which will affect driving comfort and safety. Therefore, it is necessary to study the joint longitudinal joint of old bridge with hollow slab beam in widening old bridge. Based on the experience and development of bridge widening at home and abroad, this paper summarizes the structural form, widening principle and connection mode of hollow slab girder bridge, beam lattice method and the calculation of transverse load distribution. The main contents of this paper are as follows: 1. Through the scale model test, the widening of the fabricated simply supported hollow slab girder bridge is studied, and the influence of deflection and transverse distribution of load on the old bridge before and after widening is analyzed by using the finite element method. The calculation model of the bridge before and after widening is established, and the transverse distribution law of load is obtained, which is consistent with the overall trend of the test within the range of errors permitted. The calculation model can be applied to the parameter analysis in the future. On the basis of finite element method, the height of longitudinal joint polymer concrete is discussed by using the method of parameter analysis. The influence of width and modulus of elasticity on the transverse distribution of longitudinal joint and mid-span load after widening.) the influence of the settlement of the new bridge on the lateral force of the longitudinal joint after widening is analyzed, and the settlement amount required to be controlled is put forward.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445.6

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