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Application of Structural Topology, Shape and Size Optimization Method in the Design of Cable-stayed Bridge Girders

Author: HuQiuXiang
Tutor: ZhangXuMing
School: Hohai University
Course: Structural Engineering
Keywords: Cable-stayed bridge Main beam Topology Optimization Shape Optimization Size Optimization
CLC: U448.27
Type: Master's thesis
Year: 2005
Downloads: 294
Quote: 4
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Abstract


Cable-stayed bridge is a high-order statically indeterminate structure. Cable-stayed bridge is a cable-stayed bridge girder one of the main load-bearing elements, facades and main beam cross-sectional structure type, on the mechanical behavior of the entire system, driving conditions, economic, etc. have a direct impact. Therefore, the cable-stayed girder bridge design and safety in the whole occupies a pivotal position. However, due to the force main girder cable-stayed bridge conditions are complicated, so its design is more difficult. Design are developed based on experience initial structure size, several trials to meet the conditions to obtain optimum structure. This structure optimization design is to improve the design level, reducing the designer's tedious labor. This paper combines Junshan Yangtze River Bridge, a cable-stayed bridge girder for lateral topology optimization, vertical shape optimization and size optimization studies on three levels. Main contents are: (a) for the traditional evolutionary structural optimization method singularity problem, a convergence of the two sides based on the evolutionary structural optimization method. This method not only can guarantee iterations to converge to the optimal solution, and fast convergence and simple programming. (2) With this convergence of both sides based on the evolutionary structural optimization method for a horizontal girder cable-stayed bridge topology optimization studies. Theoretically proved that the closed box section is cable-stayed main span steel girder section forms the most reasonable, but also proved that the parties to the evolutionary structural optimization method of practicality, feasibility. (3) according to the lateral topology optimization results to determine the topology of the main beam cross-section to establish the spatial stayed slabs, beams and rod combination unit model, the cable-stayed bridge girder for longitudinal shape and size optimization. Objective function based beam cross-sectional area of ??the smallest. Study found that longitudinal rib spacing and location of the top and bottom of the stress and displacement have a great impact. Rib spacing is too large, it will increase the roof, floor and rib plate thickness, the structure is irrational, and the spacing is too small and will give the construction inconvenience. (4) because of the shape and size optimization model is used in space, so must also be optimized for a cable-stayed bridge cable force optimization, shape and size optimization and optimization of cable force stratified. Research shows: Select the main beam cross-sectional area as the objective function, but also can reduce the amount of cable. Meanwhile, the cable force optimization allows cable forces more evenly.

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