Experimental Study On Bending Performance Of C-Section Checkered Steel-Encased Concrete Composite Beam With Laminated Slab

C-section checkered steel-encased concrete composite beam with laminated slab is composed of checked steel plate with C-section. Putting prefabricated concrete slab on the flange of steel beam, then pouring concrete inside beam’s rib and on the prefabricated slab could make it be a new type of lateral load-bearing component. Through pattern on the inner side of the steel beam could improve bonding strength. It would further enhance the capacity of two kinds of material to work together and give full play to combination action if applying bent-up tab shear connector on the interface or setting vertical edge along top flange of the steel beam.Relative longitudinal slip is inevitable in loading process of composite beam, which has adverse influence on bearing capacity and deformation performance of components. Based on it, the static loading experiment has been conducted to 7 full-scale simply supported specimens under positive bending moment. By changing the form and the number of shear connector as well as cross section width to be different structural formations, the bearing behavior under slip effect has been studied. The experimental results show that steel pattern could strengthen slip performance, applied with shear connector would remarkably improve slip resistance and make composite beam with strong flexural bearing capacity and good deformation behavior. Compared with vertical edge, bent-up tab shear connector is better in combination effect.According to theoretical analysis, the formula for capacity of slip resistance has been established, and calculation formula of bearing capacity has also been putted forward which adopts simplified plastic method with reduction in internal level arm to take the influence of slip on ultimate bending capacity into consideration. At the same time, the slip differential equation has been proposed through slip mechanism, then the expression of deflection in midspan with the consideration of slip effect in the elastic stage has been derived. The values from theoretical calculation show good agreement with experimental results.