外接式钢—混凝土组合桁架节点转动刚度研究

发布时间：2018-01-11 04:32

本文关键词：外接式钢—混凝土组合桁架节点转动刚度研究　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：钢-混凝土组合桁架结构以其优越的力学性能被广泛应用于建筑桥梁结构中。外接式组合桁架结构节点具有自重轻、刚度大、整体性能优越等特点。但在外荷载作用下,节点由于局部变形,引起节点转动,这种不同于刚接和铰接的转动特性对桁架结构受力、变形都有显著影响,但是国内外对此研究较少。本文基于已有模型试验,通过有限元分析,研究外接式组合桁架节点的转动刚度,主要研究成果如下： (1)建立了外接式组合桁架节点有限元分析模型,并与已有的试验结果进行对比,验证了分析模型的正确性。 (2)以节点组成各构件为独立分析对象,分析了节点在平面内弯矩作用下构件的应力分布规律,重点分析了节点板和腹杆对节点转动刚度的影响。 (3)通过对节点的参数分析,认为腹杆宽厚比、弦杆与腹杆夹角、腹杆高宽比和节点板厚度对节点转动刚度有明显影响。得到了节点转动刚度的线性回归公式,并给出了公式的适用范围。 (4)建立了考虑初始转动刚度影响的钢-混凝土组合桁架梁桥有限元模型。分析了初始转动刚度对次应力、内力和变形的影响。
[Abstract]:Abstract: steel-concrete composite truss structure is widely used in building bridge structure for its superior mechanical properties. The joints of external composite truss structure have light weight and large stiffness. The overall performance is superior, but under the external load, the joint rotates because of the local deformation, which is different from the rigid and hinged rotation characteristics of the truss structure has a significant impact on the force and deformation. However, there is little research on this at home and abroad. Based on the existing model tests and finite element analysis, the rotational stiffness of external composite truss joints is studied in this paper. The main results are as follows: 1) the finite element analysis model of external composite truss joints is established, and the correctness of the analysis model is verified by comparing the results with the existing test results. In this paper, the stress distribution of the joints under the action of in-plane bending moment is analyzed, and the effects of the joint plate and web bar on the rotational stiffness of the joints are analyzed. Through the analysis of the parameters of the joint, it is considered that the ratio of width to thickness of the web bar and the angle between the chord and the web rod. The ratio of web height to width and the thickness of the joint plate have obvious effects on the rotational stiffness of the joint. The linear regression formula of the rotational stiffness of the joint is obtained and the applicable range of the formula is given. The finite element model of steel-concrete composite truss girder bridge considering the effect of initial rotational stiffness is established, and the influence of initial rotational stiffness on secondary stress, internal force and deformation is analyzed.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

【参考文献】