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Title |
Concrete Aging-Dependent Deflection Analysis of Flexural Composite Members Using Sectional Analysis Method
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Keywords |
단면해석; 콘크리트의 크리프 및 건조수축; 이중합성 구조; 시간종속적 처짐해석; sectional analysis; concrete creep and shrinkage; double composite steel box girder; deflection analysis |
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Abstract |
An analytical method to predict the time dependent flexural behavior of composite girder is presented based on sectional analysis. The time dependent constitutive relation accounting for the early-age concrete properties including maturing of elastic modulus, creep and shrinkage is derived in an incremental format by the first order Taylor series expansion. The sectional analysis calculates the axial and curvature strains based on the force and moment equilibriums. The deflection curve of the girder approximated by the quadratic polynomial function is calculated by applying to the proper boundary conditions in the consecutive segments. Numerical applications are made for the 3-span double composite steel box girder which is a composite bridge girder filled with concrete at the bottom of the steel box in the negative moment region. The calculated results are compared with those by finite element analysis results. Close agreement is observed between the two approaches.
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