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Analysis and Optimization of the Hanging Cable Position of Extradosed Cable-Stayed Bridge with Steel-Concrete Composite Beams

Author: FangDan
Tutor: LiuWenHui
School: Jilin Architectural and Civil Engineering
Course: Structural Engineering
Keywords: Steel - concrete composite beams Extradossed bridges Cable-stayed Composite beam negative moment Optimization
CLC: U448.27
Type: Master's thesis
Year: 2010
Downloads: 75
Quote: 0
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Abstract


The thin structure size and the combination of basic bridge type has become a bridge structure today the development of two major trends . Structure came into steel - concrete composite beams and low tower cable-stayed bridge is these two trends representatives . Development advantage of the structural advantages of the composite beam and dwarf tower cable-stayed , we can easily see the reasonable use of the two structures together will bring better structural optimization , higher benefits . This article attempts by the finite element method , using modeling software simulation of composite beams in the low tower cable-stayed bridge in the working state . First , reference works , the use of finite element modeling and analysis software Midas / Civil space grillage method to create a combination beam dwarf tower cable-stayed space finite element model to the Lanzhou Xiaoxihu Yellow River Bridge and Green River Bridge . Secondly, the establishment of the cable forces influence matrix to cable force , bending moment and displacement for the optimization objectives , optimal adjustment of the tension in the cable initial to use Midas / Civil optimization function , optimize backstay initial tension and the main beam negative moment are decreases , bridge internal force reasonable optimization . Finally, according to the theorem of the translational force , within the allowable range in Liang Gaorong change cable hanging cable position . Based on the principle of tone values ??, using MATLAB optimization toolbox combination Liang Suocheng by negative moment smallest absolute value for the optimal objective mathematical model for solving the optimal hanging rope point and achieve a sharp reduction of the composite beam negative moment decreased to 56.1% , and to optimize the results are obvious . This shows that by adjusting the cable hanging rope position , can effectively improve the composite beam internal force distribution to its full ability to resist positive moment , so as to achieve the best working condition . This work will composite beams extradossed bridges provide a reference .

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