FINITE ELEMENT ANALYSIS OF CREEP AND SHRINKAGE OF STEEL-CONCRETE COMPOSITE BEAMS

Based on the age-adjusted effective modulus method, this paper presents a simplified finite element model for analysis of creep and shrinkage of steel-concrete composite beams with incomplete interaction. The shear connector element stiffness matrix considering slip is derived. Newton-Raphson solution procedure is used to calculate the effect of slip between concrete slab and steel beam. This model also accounts for the effect of concrete slab cracking on rigidity and strength of composite beam. With this finite element model, deflection, stress and slip of a continuous composite beam under long-term load are computed. Numerical results are compared with the test results and available values of other numerical methods, and good agreement is reached. It is shown that the model is reliable in the analysis of steel-concrete composite beams.