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Completed and Construction Stages Cable-force Optimization Practice Research in Cable-stayed Bridge

Author: GeShiYin
Tutor: ZhengZuo；ZhaoZhan
School: Chongqing Jiaotong University
Course: Architecture and Civil Engineering
Keywords: Cable-stayed Bridge built bridge stage construction stage Cable tension optimization
CLC: U448.27
Type: Master's thesis
Year: 2009
Downloads: 60
Quote: 1
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Abstract


The paper summarizes several common calculation methods of Cable-stayed Bridges and the theory of Cables Tension Optimization at first, then aims at dead load cable tension on built bridges and initial tension determination at the construction stage separately, uses a full-floating, two towers three-span prestressed concrete cable-stayed bridge as an example, and adopts the model of plane frame to discuss the application of the theory of Cables Tension Optimization on built bridges and at the construction stage Under multi-objectives and multi-constraints.Three optimization objectives which are the smallest bending energy, the mallest variance of cable tension between full-bridge adjacent cables, and the minimum amount of cables used in the full bridge, are adopted in the research of specific real bridges. There are also some constraints introduced, such as the stress control of the main beam from top to bottom edge , the control of tower bottom bending moment, the control of beam support reaction force, the control of the relationship of cable tension among cables and the control of the maximum and the minimum cable tension. According to the method of finite element numerical analysis , we propose a multi-objective optimization approach and work out the corresponding calculation program by Matlab. Through the different combinations and the different or same weights optimization among various targets, we can achieve a bridge at a reasonable state.with regard to the way to confirm the initial tension at the construction stage of cable-stayed bridges , the paper, referring to the preliminarily determined ideal state of a bridge, calculates the matrix which can be used to measure the level that the initial tension at the construction stage affects the internal force, and develops the optimization objectives of cable tension and constraints .By optimizing the calculations to determine the initial tension at every stage and amending the state of built bridges, we can reduce a number of iteration and the pro forma processes.

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Cable-stayed bridge
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