混凝土自锚式悬索桥受力性能分析

发布时间：2018-06-12 01:18

本文选题：自锚式悬索桥 + 成桥平衡状态　；参考：《东北林业大学》2014年硕士论文

【摘要】：自锚式悬索桥因其造型美观,适应地形能力强等优点,备受桥梁建设者的青睐。本文以牡丹江大桥为工程背景,分析混凝土自锚式悬索桥的受力性能。本文首先说明了悬索桥的三种基本计算理论即弹性理论、挠度理论、有限位移理论以及非线性影响因素即结构大位移、缆索自重、缆索初始内力、混凝土收缩徐变等引起的结构非线性；其次说明了自锚式悬索桥成桥平衡状态的三种计算方法即多段悬链线法、抛物线法、节线法,依据节线法使用MIDAS/Civil有限元软件建立了全桥有限元模型,并根据合理成桥状态的目标,通过迭代分析其成桥平衡状态的合理性;再次通过对自锚式悬索桥的影响线进行分析,确定了荷载试验研究方案,并进行了实桥荷载试验,实验结果表明加劲梁具有良好的竖向刚度、强度和抗裂性,主塔具有良好的刚度,吊杆满足设计要求,整体桥梁结构在静荷载作用下具有良好的受力性能；之后通过有限元模型的计算,分析了该桥在恒载、活载、温度荷载、风荷载等荷载单独作用和组合作用下加劲梁、缆索吊杆、主塔等构件的内力和位移；最后对该桥动力特性进行有限元分析,并实测了该桥的动态特性和振动响应,通过理论和试验对比分析,研究了该桥的振动特性,包括振型、频率、阻尼比等,并可得试验所测的振动特性与有限元理论计算的振动特性相符合,且在动力分析基础上,也研究了桥梁的抗风性能。
[Abstract]:Self-anchored suspension bridge is favored by bridge builders for its beautiful shape and strong ability to adapt to terrain. Taking Mudanjiang Bridge as the engineering background, this paper analyzes the mechanical behavior of concrete self-anchored suspension bridge. Firstly, three basic calculation theories of suspension bridge, namely elastic theory and deflection theory, are introduced. The theory of finite displacement and the nonlinear factors, such as large displacement of structure, cable weight, initial internal force of cable, shrinkage and creep of concrete, etc. Secondly, three calculation methods of the equilibrium state of self-anchored suspension bridge are described, which are multi-segment catenary method, parabola method, nodal method, and the finite element model of the bridge is established by using Midas / Civil finite element software according to the nodal line method. According to the goal of the reasonable state of the bridge, the rationality of the equilibrium state of the completed bridge is analyzed iteratively, and the influence line of the self-anchored suspension bridge is analyzed again, the research scheme of load test is determined, and the load test of the real bridge is carried out. The experimental results show that the stiffened beam has good vertical stiffness, strength and crack resistance, the main tower has good stiffness, the suspender meets the design requirements, and the whole bridge structure has good mechanical performance under static load. Then, the internal forces and displacements of the stiffened beam, cable crane, main tower and so on are analyzed by the finite element model under the single and combined loads such as dead load, live load, temperature load, wind load and so on. Finally, the dynamic characteristics of the bridge are analyzed by finite element method, and the dynamic characteristics and vibration response of the bridge are measured. The vibration characteristics of the bridge, including mode, frequency, damping ratio and so on, are studied by theoretical and experimental comparative analysis. The vibration characteristics measured by the test are in agreement with the vibration characteristics calculated by the finite element theory and the wind-resistant performance of the bridge is also studied on the basis of dynamic analysis.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25

【参考文献】