双层交通混凝土箱梁传力路径试验研究与分析

发布时间：2019-03-02 14:53

【摘要】：面向双层交通预应力混凝土箱形梁这种新的结构形式是使城市桥梁实现双层交通较为理想的形式。本文结合导师的国家自然科学基金项目-面向双层交通混凝土箱形梁受力机理及设计方法研究(项目批准号:51378202),重点研究了双层交通箱梁试验模型的传力路径,论文主要工作如下:(1)对箱梁模型的顶板在弹性范围内分别进行了单点加载(六个工况)和组合加载(六个工况)的试验研究,测得了箱梁模型三个控制截面的挠度以及应变变化情况,以及板和加劲肋单点加载的局部挠度及应变情况。(2)通过合理选择材料参数和单元类型,运用有限元ABAQUS建立双层交通箱梁的数值模型,对试验工况进行模拟,并将分析数据与试验实测数据进行对比,其分析结果与试验结果吻合良好,验证了该数值模型的合理可行性。(3)在数值模型合理可行的基础上,将顶板组合加载中四个工况的加载位置分别调整到底板对应的位置进行分析,并将其与顶板加载时的分析结果进行对比,发现二者整体变化规律基本一致。(4)运用刚性横梁法、横向刚接梁法以及位移挠度法计算节点加载的横向分布系数,在与数值分析结果对比的基础上,对横向刚接梁法进行修正,得到了节点加载的横向分布规律,从而基本得到了箱梁模型的传力路径。
[Abstract]:The new structural form of prestressed concrete box beam facing double layer traffic is an ideal form to realize double layer traffic of urban bridge. In this paper, combined with the project of National Natural Science Foundation of China-study on the stress mechanism and design method of double-layer traffic concrete box girder (Project Grant No. 51378202), the force transfer path of the double-layer traffic box girder test model is studied emphatically. The main work of this paper is as follows: (1) the single point loading (six working conditions) and combined loading (six working conditions) of the roof of the box girder model in the elastic range are studied. The deflection and strain changes of the three control sections of the box beam model, as well as the local deflection and strain of the plate and stiffened ribs under single point loading are measured. (2) the material parameters and element types are reasonably selected. The numerical model of double-layer traffic box girder is established by finite element method (ABAQUS), and the test conditions are simulated. The analysis data are compared with the experimental data, and the analysis results are in good agreement with the test results. The reasonable feasibility of the numerical model is verified. (3) on the basis of the reasonable and feasible numerical model, the loading positions of the four working conditions in the combined loading of roof are adjusted to the corresponding positions of the floor plate for analysis. Compared with the analysis results of roof loading, it is found that the whole change law of them is basically the same. (4) using rigid beam method, transverse rigid beam method and displacement deflection method to calculate the lateral distribution coefficient of joint loading. Based on the comparison with the numerical results, the transverse distribution law of the joint loading is obtained by modifying the transverse rigid beam method, and the load transfer path of the box beam model is basically obtained.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441

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