Experimental Investigation Of Self-anchored Suspension-cable Stayed Bridge

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.