【作者】 任更锋；

【导师】 徐岳；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2009， 博士

【摘要】 自锚式悬索-斜拉组合体系桥梁是一种崭新的桥型，兼有自锚式悬索和斜拉桥的特点，结构新颖，造型独特、线形流畅优美，但作为一种新型结构体系桥梁，结构复杂，受力不很明晰，自锚式悬索-斜拉组合体系桥梁吊杆张拉施工是一个复杂的非线性过程，困扰桥梁设计和施工。特别是本文依托工程江苏省交通科学研究计划项目(06Y19B)龙城大桥，为空间主缆、空间索面、倾斜拱形桥塔，结构受力更加复杂，结构是否能够形成相互协作的体系，桥梁是否能够形成理想的线形，如何在施工中保证结构形成理想线形。对该结构体系进行模型试验研究，是很好的解决上述问题的方法，但目前试验中存在单一材质不适用于复杂结构桥梁，采用多项材质换算参数多，换算关系复杂、工作量大，并且在试验中如何更好的测试缆索的变形以及吊杆的应力。针对这些问题本文主要研究内容有：1、针对单一材质模型不适合于复杂桥梁结构的问题，以相似理论为基础，提出基于多相材质的模型试验理论。根据量纲理论推导在集中荷载、均布荷载、弯矩作用下，模型与原型相似的应力、应变、挠度相似判据。2、基于已有复杂模型换算过程换算参数多，换算工作量大的特点，考虑多相材质模型中弹性模量的差异，提出将弹模计入结构刚度考虑的方法，推导了模型配重关系式，得到了测量物理量的换算关系式。并对依托工程进行模型设计，确定模型截面，考虑原型边界条件，进行模型加工制作。3、考虑自锚式悬索-斜拉组合体系桥梁的非线性特征，基于有限位移法建立依托工程施工全过程仿真分析，得到不同施工阶段主缆、斜拉索、吊杆、主梁和主塔在不同施工阶段的内力和位移。通过模型试验，分析了吊杆张拉方式对结构体系力学行为的。4、针对模型试验中结构尺寸小，测试精度要求高的特点，研制适合于缆索结构的测力传感器。针对模型试验中空间缆索变形，人工测试精度低、效率差的特点，提出适合于缆索结构变形的测试方法，并确定测试方法的适用条件。5、通过施工阶段模型试验，研究自锚式悬索-斜拉组合体系桥梁施工阶段力学行为及受力性能，分析空间索缆线形变化规律和结构整体性能，得到在合理施工方法下，自锚式悬索-斜拉组合体系能够达到预期的空间主缆线形并实现协同受力。6、根据桥梁作为城市主干道运营特点，对依托工程进行使用阶段的满载和偏载模型试验，研究了结构的使用安全性。更多还原

【Abstract】 Self-anchored suspension cable-stayed bridge is a new type of bridge. which has suspension bridge’s and cable-stayed bridge’s obviously characteristic. It has novel structure, the unique model, smooth and exquisite linear, and is popular. But be a kind of new structure system bridge, the structure is complex, the stress is not very defined. Construction of the hanger rod for self-anchored suspension cable-stayed bridge is a complex non-linear process, trouble bridge design and the construction. In this thesis, in particular, supported by scientific research project of Jiang su Province Transport Project (06Y19B) Long cheng Bridge, which has the space main cable, space cable plane, inclined arch bridge towers and complex structure. The problem is whether the structure can form a system of mutual collaboration, the main-cable be an ideal linear and how to construct the bridge to be ideal linear. The structural model experiment, is a good way to resolve these issues. Single material does not apply to the complex bridge model experiment, multiphase material model has more material parameters, complex conversion relationship and more woke. How to test the cable deformation and stress is a problem for model experiment. The main research content includes:1. Consider single material does not apply to the complex bridge model experiment, base on the similarity theory, the paper analyze the three correspondence theorems, propose model experiment theory of multiphase material, inferred the stress, the strain, the amount of deflection similarity criterion between the model and the prototype, according to the theory of dimensions in the concentrated load, the uniform load, moment.2. In consideration multiphase material model has more material parameters, complex conversion relationship and more woke, multiphase material model elastic modulus difference, proposed the structural stiffness include elastic modulus, has inferred the model counterweight relationship, obtained the survey physical quantity conversion relationship. Take the long-cheng bridge as a prototype, carries on the pattern layout, confirm the model section, consider the prototype boundary condition, machining the model. Propose the model experiment test technology for the cable structure.3. The nonlinearities of self-anchored suspension cable-stayed bridge are studied, construction of long cheng bridge is analyzed with nonlinear finite element method. Internal force and displacement of the stay cable、main cable、hanger rod、stiffening girder and the tower are given in each step of construction. Through the model experiment, analyze the behavior of structure based on different hanger rod construction.Analyze finished bridge state and the reasonable construction condition of self-anchored suspension cable-stayed bridge, then propose the technology that suit to self-anchored suspension cable-stayed bridge with spatial main cable and incline hanger rod.4. Structural model is small, to get high-precision test, the test sensor is designed for the cable structure test. Cable testing methods is provide for the model test cable to improve test accuracy and efficiency. Determine the appropriate conditions of the testing methods.5. Research the long cheng bridge construction stage model experiment, with the bridge construction process. Studies self-anchored suspension cable-stayed bridge construction mechanics behavior and the stress performance, analyze the spatial main cable displacement, to provides the essential technical support for design and construction.6.As the urban main road, research using stage model experiment, with the long cheng bridge on the phase of the full load or offset load, study the structure operational safety.更多还原