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http://dx.doi.org/10.4334/JKCI.2004.16.2.155

Concrete Aging-Dependent Deflection Analysis of Flexural Composite Members Using Sectional Analysis Method  

Sung Won-Jin (Dept. of Civil Engineering, Konkuk University)
Kim Jeong-Hyeon (Dept. of Civil Engineering, Konkuk University)
Lee Yong-Hak (Dept. of Civil Engineering, Konkuk University)
Publication Information
Journal of the Korea Concrete Institute / v.16, no.2, 2004 , pp. 155-162 More about this Journal
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.
Keywords
sectional analysis; concrete creep and shrinkage; double composite steel box girder; deflection analysis;
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