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Long-term performance of steel - concrete composite box girder

Author: JiangYaPeng
Tutor: LiuXiaoJie
School: Central South University
Course: Structural Engineering
Keywords: Steel - concrete composite beam Slippage Finite Element Shrink Creep
CLC: TU398.9
Type: Master's thesis
Year: 2010
Downloads: 110
Quote: 0
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Abstract


Steel - concrete composite beam steel beams and concrete slab by shear connectors connected to form the overall flexural members to work together . In the long - term loads , the concrete will have to creep and shrinkage , and steel does not have this phenomenon , the difference of the two materials can cause stress redistribution in the cross-section and enable the structure to generate a lot of additional deformation , in large, complex structures creep and shrinkage consequences are relatively more serious , this effect will make the burden of connections , and may even produce a large number of slip, seriously affect the performance of the steel and concrete composite box girder work together . This article launched a long-term performance of the composite box girder , the main contents are as follows : (1) by the variational method based on the principle of minimum potential energy , steel - concrete composite box girder taking into account the interfacial slip and shear lag effect in the short-term loads can solve the the joint differential equation of the composite box girder deflection and slip function . Solving for simply supported composite box girder deflection under the effect of shear lag and interfacial slip concentrated load and uniformly distributed load and the analytical expression of the interfacial slip . (2) the use of the age-adjusted effective modulus method to consider concrete shrinkage , creep, further establish the effect of shear lag composite box girder sustained loads and interfacial slip effects of deflection and slip joint differential equations , solving draw the shear lag effect and interfacial slip uniformly distributed load of simply supported composite box beam deflection and the analytical expression of the interfacial slip , and specific examples are solved . ( 3) the use of finite element software ANSYS steel and concrete composite beam with short and long-term load performance analysis , compared with before the theoretical results obtained , obtained the stress and deformation characteristics of the composite box girder under the long-term load . (4) using ANSYS software to further the mechanical properties of the composite box girder under the long-term load simulation test , including changes in the degree of shear connection stud arrangement , different cross-sectional dimension of the cross section parameter steel - concrete long-term mechanical properties of composite box girder , got some useful conclusions .

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CLC: > Industrial Technology > Building Science > Building structure > Composite structure > Other composite structures
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