The Design And Construction Control Related Problem Analysis Of Self-Anchored Suspension Bridge

Now self-anchored suspension bridge is drawing people's attention more and more since its kinds of advantages. Since its process of construction is different from traditional suspension bridge, there are many things to study in its design and construction control. This thesis commences from this aspect, carrying on the analytical research towards the final rational cable force and parameters identification in the process of construction and parameters errors affect result of self-anchored suspension bridge.The rational cable force of self-anchored suspension bridge can be researched by the methods being used in optimizing the cable force of cable-stayed bridge. According to the theory, the thesis mainly discusses the continuous beam with rigid supports method, minimum bending energy principle and internal force equilibrium method in optimizing cable force;and takes three familiar kinds of self-anchored suspension bridge as the calculation example, uses the self-programmed program to solve the reasonable cable force. The calculated results is put into the BNLAS to carry on the nonlinear analysis and the comparison with program results, It proves the rationality and possibility of the program that can be used for the construction and design.Identification and revision of the parameters of self-anchored suspension bridge is very important in the construction control, this thesis first introduces the basic principle of least-square method and its application in the bridge engineering. Then takes the trial model of Pingsheng bridge of Foshan in Guangdong province as the example, uses the BNLAS software to carry on the structure calculation and sensitivity analysis of the parameter to determine the main design parameters. At last uses least-square method and the experiments' data to identify and adjust the trial parameters of the self-anchored suspension bridge. Taking the final results into the calculation model to analyze can get the main parameters errors of the trial model of Pingsheng bridge.Since the existence of parameters errors produces great effects to the self-anchored suspension bridge, there takes Pingsheng bridge as example in the thesis, analyzes the modulus of elasticity of main cable, the force ofhangers in the process of tension, the weight of stiffening girders and the changes induced by the varieties of inertia moment of stiffening girders after the self-anchored bridge being finished. According to the analysis, the influence of various parameters errors to the structure's line type and internal force can be get, then, the scope of parameters errors can be put forward also.