【作者】 李彬；

【导师】 卢哲安；

【作者基本信息】 武汉理工大学 ， 结构工程， 2009， 硕士

【摘要】 钢管混凝土结构利用钢管和混凝土两种材料在受力过程中的相互作用,即钢管对核心混凝土的约束作用,使核心混凝土处于三向受压状态,从而使核心混凝土具有更高的抗压强度,塑性和韧性性能也大为改善。同时,由于核心混凝土的存在可以避免或延缓钢管发生局部屈曲,从而可以保证其材料性能的充分发挥。目前,国内外关于钢管混凝土的应用和研究以圆形截面、方形截面和多边形截面为主。武汉市黄陂区后湖大桥主塔采用圆端形钢管混凝土双肢塔柱,塔柱结构形式新颖,应用较少,国内外关于其受力性能的研究以及相关的文献报道也不多见。本文依托后湖大桥主塔圆端形钢管混凝土双肢塔柱数值模拟与应力监测技术项目,参考大量文献,对塔柱在施工阶段的受力性能和钢管与混凝土相互作用性能进行了应力监测试验、有限元静力分析和有限元接触分析,所做的具体工作包括:1.根据以往的文献资料和分析成果,认识了钢管与混凝土相互作用的原理、钢管混凝土的界面状态、钢管混凝土粘结强度的定义以及影响钢管与混凝土之间粘结强度的主要因素,探讨了研究钢管与混凝土相互作用性能的方法,阐述了研究钢管与混凝土相互作用的意义。2.介绍后湖大桥圆端形钢管混凝土双肢塔柱应力监测试验,并对试验数据进行分析,初步反映了塔柱在施工阶段的受力性能。暂不考虑钢管与混凝土的相互作用,将钢管与混凝土作为组合材料,以共节点的方法建立ANSYS有限元模型,对塔柱在不同施工工况下的受力性能进行了有限元静力分析。3.考虑钢管与混凝土的相互作用,对圆端形钢管混凝土双肢塔柱进行ANSYS有限元接触分析。根据接触分析原理,对钢管和混凝土两种材料,选择正确的接触方式,选取恰当的单元,并定义相应的实常数、本构关系和关键字,对塔柱进行了不同施工工况下钢管与混凝土相互作用的分析。本文接触分析采用的方法计算收敛快,计算结果与应力测试结果一致。更多还原

【Abstract】 The interaction between the two different materials of steel tube and concrete of concrete-filled steel tube (CFST) in the course of being compressed, that is, the con--finement to the core concrete from the steel tube, makes the core concrete in the state of being compressed from three dimensions, so that the core concrete has a higher compressive strength, plasticity and toughness performance.At the same time, due to the existence of the core concrete, the occurrence of local buckling of the steel tube is avoid or delayed,which can guarantee the property of it getting into full play.At present, both at home and abroad, the application and study of CFST are mainly focused on circular section , square cross-section and polygonal section. A round-ended concrete-filled steel tube coupled tower column is used in Houhu bridge in Huangpi district in Wuhan,which is a novel structure and applicated lessly. The study of this structure’s mechanical performance and the related literature about it are also rare at home and abroad.In this paper,based on Houhu bridge round-ended concrete-filled steel tube coupled tower column numerical simulation and stress mo--nitoring technology project,consulting a large number of literature references, stress monitoring tests, static analysis of finite element and finite element contact analysis are applicated in the mechanical performance and the interaction between steel and concrete of the CFST tower column in its construction stage.The specific works incl--ude:1. Based on previous literature and analysis of the results of CFST ,the principles of the interaction between steel and concrete, the interface state of CFST,the defini--tion of bond strength of CFST, as well as the main influencing factors about the bond strength between steel and concrete are discussed in this paper.The methods used in the study of the interaction between steel and concrete are being introduced and the meaning of studing the interaction between steel and concrete is also being understan--ded.2. The stress monitoring tests in Houhu bridge is introduced and the test data is analysed in this paper.The results of the analysis initially reflected the mechanical performance of the tower column in the construction stage. Then, the interaction between steel and concrete will not be considered, steel and concrete will be as a combination of materials to create a ANSYS finite element model with methods of sharing nodes.The finite element static analysis about the mechanical properties of the CFST tower in different conditions in construction stage is done.3. Considering the interaction between steel and concrete, ANSYS finite element contact analysis about the CFST tower is done. Based on the principle of contact analysis,according to the two different materials of steel and concrete, the right contact approach, the appropriate units ,the corresponding real constant ,the constituti--ve relations as well as the KEYOPTS are selected. Then,the interaction between steel and concrete of the CFST tower is analysed with the methods of ANSYS contact analysis. The contact analysis method used in this paper is of fastly convergence and the results are in accordance with the results of the stress monitoring test.更多还原