Method for flexural bearing capacity of steel-concrete composite beam based on equivalent coefficient of compressive area of concrete slab

The sliding between the concrete slab and steel beam reduces the flexural bearing capacity of the steel-concrete composite beam. To obtain the flexural bearing capacity of the composite beam, the method based on the equivalent coefficient of compressive area (ECCA) of the concrete slab was proposed in this paper. Finite element models of the composite beams were established to investigate the effects of different parameters on the ECCA of the concrete slab and yield area ratio of the steel beam. The results indicated that the ECCA of the concrete slab, in the partial shear connected composite beam, is mainly affcted by the degree of shear connection and the sliding between the concrete slab and steel beam. The ECCA increases with the increasing of the degree of shear connection, and the ECCA was fitted. In the full and partial shear-connected composite beam, the steel beam is in a full section yield status under ultimate bending load. Comparing the formulas proposed in this paper with those in other literature, this method has a high accuracy and simple form in predicting the flexural bearing capacity of the full and partial shear connected steel-concrete composite beam.