混合梁斜拉桥钢—混结合段受力特性及试验模型方案研究

发布时间：2018-02-25 07:10

本文关键词： 钢-混结合段受力特性模型试验应力等效应力分布　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：混合梁斜拉桥中混凝土边跨有压重的作用,平衡中跨受力,钢-混结合段是混合梁斜拉桥的重要组成部分,其构造形式复杂,应力分布复杂,目前国内大跨度铁路混合梁斜拉桥应用相对较少,其钢-混结合段的受力特性研究相对较少。潭江特大桥是铁路斜拉桥采用钢-混结合段的桥例,该钢-混结合段采用有格室前后承压板式的形式构造,目前对于铁路斜拉桥钢-混结合段的研究较为缺乏,同时也缺乏对有格室前后承压板式钢-混结合段受力特性的研究,基于上述情况,本文以潭江特大桥为工程背景,对其钢-混结合段的组成构件的受力特性进行研究,并进行试验模型的方案设计。本文主要的研究内容及研究结论如下:1、通过建立潭江特大桥钢-混结合段的有限元模型,研究钢-混结合段钢箱梁外表面板、刚度过渡段、前后承压板、结合段内钢格室纵隔板、纵腹板以及混凝土梁等组成构件在主力+附件力最大正弯矩和主力+附加力最大负弯矩两种工况下的应力分布状态,分析了各组成构件的应力分布规律,研究了各组成构件的应力变化趋势。2、对潭江特大桥有格室前后承压板式钢-混结合段的试验模型方案进行研究。针对该钢-混结合段的结构特点和受力特性,设计试验模型,通过两个试验模型方案的对比计算分析,最终选取试验模型方案二为该钢-混结合段的试验模型,并确定了模型试验的测试方案及加载方案。3、通过对潭江特大桥钢-混结合段试验模型的有限元分析,分析试验模型在1.0倍设计荷载工况下和原桥结构的应力等效性,试验模型的钢箱梁外表面板、刚度过渡段、前后承压板、结合段内钢格室纵隔板、纵腹板以及混凝土梁等组成构件与原桥结构的应力分布状态相似,应力提取点的应力值与原桥结构接近,应力变化趋势和原桥结构相近,具有较好的应力等效性。
[Abstract]:In hybrid girder cable-stayed bridge, the concrete side span has the action of compressive weight, the balanced middle span is subjected to force, the steel-concrete composite section is an important part of the hybrid beam cable-stayed bridge, its structure form is complex, and the stress distribution is complex. At present, the application of large-span railway hybrid girder cable-stayed bridge is relatively few, and the research on the mechanical characteristics of the steel-concrete joint section is relatively few. The Tanjiang Bridge is an example of railway cable-stayed bridge with steel-concrete composite section. The steel-concrete joint section is constructed in the form of latticed chamber in front and back bearing plate type. At present, the research on steel-concrete joint section of railway cable-stayed bridge is relatively scarce, and the study on the mechanical characteristics of the steel concrete composite section with latticed chamber before and after compression plate type is also lacking. Based on the above situation, this paper takes the Tanjiang Bridge as the engineering background to study the mechanical characteristics of the components of the steel-concrete joint section. The main research contents and conclusions of this paper are as follows: 1. By establishing the finite element model of steel-concrete joint section of Tanjiang super bridge, the external slab and stiffness transition section of steel box girder in steel-concrete joint section are studied. The stress distribution state of the front and rear bearing plate, the steel compartment mediastinal plate, the longitudinal web plate and the concrete beam under the two working conditions of the maximum positive bending moment of the main force attached to the main force and the maximum negative moment of the main additional force, The stress distribution of each component is analyzed. In this paper, the stress variation trend of each component is studied. The experimental model scheme of the front and rear bearing plate steel-concrete joint section of Tanjiang super bridge with latticed chambers is studied. According to the structural characteristics and mechanical characteristics of the steel-concrete joint section, the test model is designed. Through the comparative calculation and analysis of the two test model schemes, the second test model scheme is selected as the test model of the steel-mixing joint section. The test scheme and loading scheme of the model test are determined. Through the finite element analysis of the test model of the steel-concrete section of Tanjiang super bridge, the stress equivalence between the test model and the original bridge structure under 1.0 times design load condition is analyzed. The stress distribution of the steel box girder exterior panel, the stiffness transition section, the front and rear bearing plate, the steel compartment mediastinal plate, the longitudinal web plate and the concrete beam of the test model is similar to that of the original bridge structure. The stress value of the stress extraction point is close to that of the original bridge structure, and the stress variation trend is similar to that of the original bridge structure, and the stress is equivalent to that of the original bridge structure.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.27

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