钢—混组合桥面系结构节段模型试验研究

发布时间：2018-06-25 14:58

本文选题：组合桥面系 + 节段模型　；参考：《长沙理工大学》2015年硕士论文

【摘要】：伴随着经济的发展,交通负荷与日俱增。桥梁作为交通工程的枢纽,其结构安全性、材料经济性和社会效益性等问题将日渐突出。钢-混组合桥面系结构作为一种新型组合结构,因其结构自重小、材料用量少、受力性能好等优越性而具有良好的应用前景。本文采用ansys软件建立了背景工程钢-混组合桥面系有限元节段模型,并运用结构参数化分析方法,分析研究了钢桁加劲梁桁高和混凝土桥面板厚度变化对结构挠度及应力的影响,并从结构挠度、经济性和材料强度等方面综合考虑得到较优组合形式。然后,根据相似理论,建立了单片钢-混组合桥面系结构的有限元模型,并制作出节段缩尺模型进行模型试验。本文完成的主要工作有:运用结构参数化分析方法,分析得出钢桁架桁高对结构挠度、桥面板和钢桁架下弦杆应力有较大影响;而混凝土板厚度对结构整体刚度的影响很小,其厚度变化对结构挠度、桥面板和钢桁架下弦杆应力的影响可以忽略不计。并根据最优组合形式,按照刚度相似的原则设计了1:8的节段缩尺试验模型。采用有限元方法对节段缩尺试验模型分析三分点两点对称荷载、跨中集中荷载以及钢桁架下弦杆各中间节点最不利等效车辆荷载等工况作用下结构变形和受力,以节段模型试验实测结果验证了有限元分析模型。另外,模拟钢桁架下弦杆各中间节点最不利等效车辆荷载作用下的结果表明:在各节点等效集中荷载作用下,随着荷载作用位置的移动,远离荷载作用点的节点位移和杆件应力逐渐减小,靠近荷载作用点的节点位移和杆件应力逐渐增大。直腹杆承受压应力,对于斜腹杆,在每一工况下除与荷载作用点左右相邻的两根斜腹杆受压外,其余腹杆所受应力是拉、压相间的。最后,提出钢-混组合桥面系结构变形计算公式。
[Abstract]:With the development of economy, traffic load is increasing day by day. Bridge as the hub of traffic engineering, its structural safety, material economy and social benefits will become increasingly prominent. As a new type of composite structure, steel-concrete composite bridge deck structure has a good application prospect because of its advantages of low self-weight, less material consumption and good mechanical properties. In this paper, the finite element model of steel-concrete composite deck system in background engineering is established by using ansys software, and the structural parameterization analysis method is used. The influence of truss height of steel truss stiffened beam and thickness change of concrete deck slab on the deflection and stress of the structure is analyzed and the optimum combination form is obtained from the structural deflection, economy and material strength. Then, according to the similarity theory, the finite element model of monolithic steel-concrete composite bridge deck system is established, and the segmental scale model is made for model test. The main work accomplished in this paper is as follows: by using the method of structural parametric analysis, it is concluded that the height of steel truss has great influence on the deflection of structure, the stress of chord under bridge deck and steel truss, and the thickness of concrete slab has little effect on the overall stiffness of the structure. The influence of thickness change on the deflection of structure, the stress of chord under bridge deck and steel truss can be neglected. According to the optimal combination form and the principle of stiffness similarity, the 1:8 segment scale test model is designed. The finite element method is used to analyze the deformation and force of the structure under the conditions of three-point two-point symmetric load, the concentrated load in the span and the most unfavorable equivalent vehicle load of the middle joints of the chord under the steel truss. The finite element analysis model is verified by the measured results of segmental model test. In addition, the results of simulating the most unfavorable equivalent vehicle loads of the chord joints under the steel truss show that: under the equivalent concentrated loads of each node, with the movement of the loading position, The node displacement and member stress far away from the load point gradually decrease, and the node displacement and member stress near the load point increase gradually. For the oblique web bar, the stress of the other web members is tension and compression phase apart from the two oblique web bars adjacent to the right and left of the load acting point under each working condition. Finally, a formula for calculating the deformation of steel-mixed composite bridge deck system is presented.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.31

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