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Analysis of Shear Deflection of Flat Steel Box Girder of Cable-Stayed Bridge

Author: WangXiaoYun
Tutor: BoYiZhi
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Cable-stayed bridge Flat steel box girder Mediastinal board Shear deformation Finite Element Method
CLC: U448.27
Type: Master's thesis
Year: 2007
Downloads: 172
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Abstract


Differential equations , respectively , based on the principle of the unit load method of the principle of virtual work , generalized coordinates method and finite element method elaborate consideration of shear beam deflection equation derived . Shear coefficient used to characterize the degree of influence of the shear deformation of the beam deflection , complex structure cross-section , the analytical method can not get the specific values ??of the shear coefficient . Large general-purpose finite element software ANSYS tools to built Su-Tong Highway Bridge over the Yangtze River as the background , consider three different conditions on the beam segment is calculated . Consider the the shear deformation BEAM44 beam element not consider SHELL63 shell element modeling of shear deformation to calculate the beam segment vertical deformation . The deformation of the two models to obtain the corresponding position value, the specific numerical values ??of the shear coefficient . Concluded : flat steel box girder shear deformation effects can not be ignored . And provides a feasible method for the complex structure in the form of the cross-section shear coefficient calculated . Different types of mediastinal board the shear deformation of the beam segments . Yangtze River Bridge , under construction Sutong Highway same background , consider three different conditions using ANSYS beam element considering shear deformation BEAM44 and considering the shear deformation SHELL63 shell element model were calculated truss mediastinal board deformation values ??and the real abdominal mediastinal plate girder segment , draw the shear coefficient , were compared . Concluded : the same conditions , the real abdominal mediastinal plate girder segment deformation value smaller than truss mediastinal plate girder segment deformation values ??, the shear coefficient that a solid web mediastinal board better reduce beam the deformation of the segment values ??, and can reduce the degree of influence of the shear deformation , increase the shear rigidity of the cross section . The real abdominal mediastinal plate girder segment in a four - point support state its cross-sectional size and related parameters are kept constant , of different - span beam segment modeling analysis , concluded that : with the increase of its span , the shear deformation reducing the influence of the beam segment vertical deformation , shear deformation can be ignored when the steel box girder span increases to a certain value .

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