悬索桥钢管混凝土桥塔受力及粘结滑移性能试验研究
发布时间：2019-01-05 17:37
【摘要】：钢管混凝土结构因其塑性及韧性好、结构承载力高等特点，在现代建筑工程结构中如大跨度桥梁、高层建筑结构得到越来越多的应用。刘家峡悬索桥采用钢管混凝土结构桥塔，是国内钢管混凝土桥塔首次在大跨度悬索桥上的应用。而国内外对钢管混凝土结构的受力及粘结滑移性能研究尤其是大跨度斜拉桥、悬索桥中钢管混凝土桥塔的研究较少。本文依据理论计算和刘家峡悬索桥桥塔节段模型试验，主要研究采用钢管混凝土结构的大跨度悬索桥塔在实际施工工况下及运营过程中的受力状况，以及大直径钢管混凝土结构在承受较大竖向荷载及弯矩时的粘结滑移性能。 运用通用有限元软件ANSYS进行有限元仿真模拟计算，按照1:5的比例制作刘家峡大桥桥塔顶部节段钢管混凝土受压试验模型及粘结滑移试验模型。在总结国内外学者对钢管混凝土结构受力性能及粘结滑移性能研究成果的基础上，结合钢管混凝土结构及大跨径悬索桥相关计算原理，选用合适的钢管及核心砼的应力-应变关系本构模型，对悬索桥桥塔模型在不同端板厚度、不同索鞍尺寸及索鞍偏心距离下的受力情况进行分析。 在悬索桥钢管混凝土桥塔结构的有限元仿真模拟过程中，参考已有钢管混凝土结构的研究成果，探讨了钢管混凝土结构有限元分析中的相关问题，如钢管与混凝土的单元类型选择、钢管与混凝土结构的应力-应变本构模型的选择、网格划分密度、接触单元的设置、收敛控制等问题，合理模拟钢管混凝土结构的受力性能及粘结滑移性能。依据桥塔的实际受力情况，包括施工过程中的索鞍顶推时桥塔的受力情况，分别在不同偏心距下对钢管混凝土桥塔节段模型施加等比例荷载，研究轴心及偏心受压时钢管混凝土桥塔节段模型的应力及位移随荷载的变化规律，同时研究了不同端板厚度下钢管混凝土桥塔模型纵向的应力、位移变化特性，，考察了大直径钢管混凝土桥塔的力学性能。 根据刘家峡悬索桥钢管混凝土桥塔节段模型推出试验结果，发现粘结应力大体上沿桥塔模型纵向为指数分布。钢管混凝土桥塔节段模型的推出试验测得的粘结破坏荷载及粘结破坏时的位移与钢管混凝土桥塔模型非线性有限元计算结果比较发现，试验测得数据较理论计算值大，但理论计算数据与试验所测得数据相比有一定的规律，分析了钢管混凝土桥塔受压及粘结滑移理论计算值与试验值相差的原因，总体上看有限元计算结果较为准确，能合理模拟悬索桥桥塔实际施工及运营过程中的受力性能。通过对刘家峡悬索桥钢管混凝土桥塔的受压及粘结滑移性能研究，可为后续大跨度悬索桥钢管混凝土桥塔的设计及研究提供参考。
[Abstract]:Concrete-filled steel tubular (CFST) structures are widely used in modern building structures such as long-span bridges and high-rise buildings because of their good ductility and toughness and high bearing capacity. The concrete filled steel tube (CFST) tower is adopted in the Liujiaxia suspension bridge, which is the first application of the CFST tower in the long span suspension bridge in China. At home and abroad, there are few researches on concrete filled steel tube (CFST) structure, especially on the long-span cable-stayed bridge, and on the concrete filled steel tube (CFST) bridge tower in suspension bridge. Based on the theoretical calculation and model test of the tower of the Liujiaxia suspension bridge, this paper mainly studies the stress condition of the long-span suspension bridge tower with concrete-filled steel tube structure under the actual construction conditions and operation process. And the bond-slip behavior of large diameter concrete-filled steel tubular structure under large vertical load and bending moment. The finite element simulation calculation is carried out by using the universal finite element software ANSYS. According to the 1:5 scale, the test model of concrete filled steel tube (CFST) at the top of the tower of Liujiaxia Bridge and the bond-slip test model are made. On the basis of summing up the research results of concrete filled steel tubular structure and bond-slip behavior, combining with the related calculation principle of concrete filled steel tube structure and long-span suspension bridge, The stress-strain constitutive model of steel tube and core concrete is selected to analyze the stress of the tower model of suspension bridge under different end plate thickness, different saddle size and eccentric distance of cable saddle. In the course of finite element simulation of concrete-filled steel tubular (CFST) tower structure of suspension bridge, and referring to the existing research results of CFST structure, the related problems of CFST structure finite element analysis are discussed. For example, the selection of element type of steel tube and concrete, the selection of stress-strain constitutive model of steel tube and concrete structure, the density of mesh division, the setting of contact element, the control of convergence, etc. The mechanical behavior and bond-slip behavior of concrete-filled steel tubular structure are simulated reasonably. According to the actual stress situation of the bridge tower, including the stress situation of the bridge tower when the cable saddle is pushed in the construction process, the concrete filled steel tube (CFST) tower section model is subjected to equal proportional loads under different eccentricity. The stress and displacement of concrete-filled steel tubular (CFST) tower model under axial and eccentric compression are studied, and the longitudinal stress and displacement characteristics of CFST tower model with different end slab thickness are studied. The mechanical properties of large diameter concrete-filled steel tube (CFST) bridge tower were investigated. According to the test results of the section model of concrete-filled steel tube (CFST) tower of Liujiaxia suspension bridge, it is found that the bond stress is exponentially distributed in the longitudinal direction of the tower model. Compared with the nonlinear finite element calculation results of concrete-filled steel tubular tower model, the experimental results of bond failure load and displacement of concrete filled steel tube bridge tower are compared with the nonlinear finite element calculation results of concrete filled steel tube tower model. It is found that the experimental data are larger than the theoretical calculation value. However, compared with the experimental data, the theoretical calculation data have a certain rule. The reasons for the difference between the theoretical calculation value and the experimental value of the compression and bond-slip of the concrete-filled steel tubular bridge tower are analyzed. The results of finite element calculation are more accurate in general. It can simulate the stress performance of suspension bridge tower during construction and operation. By studying the compression and bond-slip behavior of concrete-filled steel tube (CFST) tower of Liujiaxia suspension bridge, this paper provides a reference for the design and research of CFST tower of long-span suspension bridge.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25;U443.38
本文编号：2402092
[Abstract]:Concrete-filled steel tubular (CFST) structures are widely used in modern building structures such as long-span bridges and high-rise buildings because of their good ductility and toughness and high bearing capacity. The concrete filled steel tube (CFST) tower is adopted in the Liujiaxia suspension bridge, which is the first application of the CFST tower in the long span suspension bridge in China. At home and abroad, there are few researches on concrete filled steel tube (CFST) structure, especially on the long-span cable-stayed bridge, and on the concrete filled steel tube (CFST) bridge tower in suspension bridge. Based on the theoretical calculation and model test of the tower of the Liujiaxia suspension bridge, this paper mainly studies the stress condition of the long-span suspension bridge tower with concrete-filled steel tube structure under the actual construction conditions and operation process. And the bond-slip behavior of large diameter concrete-filled steel tubular structure under large vertical load and bending moment. The finite element simulation calculation is carried out by using the universal finite element software ANSYS. According to the 1:5 scale, the test model of concrete filled steel tube (CFST) at the top of the tower of Liujiaxia Bridge and the bond-slip test model are made. On the basis of summing up the research results of concrete filled steel tubular structure and bond-slip behavior, combining with the related calculation principle of concrete filled steel tube structure and long-span suspension bridge, The stress-strain constitutive model of steel tube and core concrete is selected to analyze the stress of the tower model of suspension bridge under different end plate thickness, different saddle size and eccentric distance of cable saddle. In the course of finite element simulation of concrete-filled steel tubular (CFST) tower structure of suspension bridge, and referring to the existing research results of CFST structure, the related problems of CFST structure finite element analysis are discussed. For example, the selection of element type of steel tube and concrete, the selection of stress-strain constitutive model of steel tube and concrete structure, the density of mesh division, the setting of contact element, the control of convergence, etc. The mechanical behavior and bond-slip behavior of concrete-filled steel tubular structure are simulated reasonably. According to the actual stress situation of the bridge tower, including the stress situation of the bridge tower when the cable saddle is pushed in the construction process, the concrete filled steel tube (CFST) tower section model is subjected to equal proportional loads under different eccentricity. The stress and displacement of concrete-filled steel tubular (CFST) tower model under axial and eccentric compression are studied, and the longitudinal stress and displacement characteristics of CFST tower model with different end slab thickness are studied. The mechanical properties of large diameter concrete-filled steel tube (CFST) bridge tower were investigated. According to the test results of the section model of concrete-filled steel tube (CFST) tower of Liujiaxia suspension bridge, it is found that the bond stress is exponentially distributed in the longitudinal direction of the tower model. Compared with the nonlinear finite element calculation results of concrete-filled steel tubular tower model, the experimental results of bond failure load and displacement of concrete filled steel tube bridge tower are compared with the nonlinear finite element calculation results of concrete filled steel tube tower model. It is found that the experimental data are larger than the theoretical calculation value. However, compared with the experimental data, the theoretical calculation data have a certain rule. The reasons for the difference between the theoretical calculation value and the experimental value of the compression and bond-slip of the concrete-filled steel tubular bridge tower are analyzed. The results of finite element calculation are more accurate in general. It can simulate the stress performance of suspension bridge tower during construction and operation. By studying the compression and bond-slip behavior of concrete-filled steel tube (CFST) tower of Liujiaxia suspension bridge, this paper provides a reference for the design and research of CFST tower of long-span suspension bridge.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25;U443.38
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本文编号：2402092
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