Abstract
Concrete-encased composite girder with corrugated steel web is proposed to improve the mechanical performance of continuous girder under hogging moment, avoiding the buckling of the corrugated web and compressive flange caused by large combined shear force and bending moment. The structural behavior under combined shear force and bending moment was investigated experimentally and analytically, the load-carrying capacity and failure mode of composite girders with different length of concrete encasement were investigated. Analytical results show that the failure modes of composite girders depend on the length of concrete encasement, and the ratio of shear to bending affects the shear stiffness after concrete cracking and ductility at ultimate load state. Based on experimental results, the analytical evolution of shear strength and bending strength were investigated, also interaction equation with respect to shear and bending strength was proposed to evaluate loading capacity of such composite girders.
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