Partial interaction analyses of composite steel-concrete girders subjected to combined bending and shear

Three different beam models for the linear viscoelastic analysis and nonlinear analysis of steel-concrete composite girders including partial interaction are compared, i.e., models derived by coupling with a deformable shear connection two Euler-Bernoulli beams (only flexural deformability and flexural failure mode), an Euler-Bernoulli beam to a Timoshenko beam (addition of shear deformability and shear failure mode for one component only), and two Timoshenko beams (addition of shear deformability and shear failure mode for both components). Results of linear analyses involving 200 simply supported and three-span compo-site girders as well as results of nonlinear analyses involving experimentally tested simply supported and con-tinuous beams are illustrated to evaluate the effects of shear in the steel and slab components at various load levels. Results show that differences between the three models are significant in many cases.