Experiment study on shear behavior of composite steel-concrete beams

Experiments were conducted on 4 steel-concrete composite beams (SCB) with compact steel sections to investigate their composite shear resistance behavior. The influence of degree of shear connection and contrast between sagging moment and hogging moment were discussed. The test results show that the interface slip regulation of SCB are varied, from sagging moment to hogging moment, it has little influence to the vertical shear strength and the vertical shear capacity is nearly 1.85 times that given by the current codes in the negative bending region. According to the experimental research on the test beams and analyses of other available test results, the shear strength equations that consider the shear contributions of both the steel beam and the concrete flange are proposed. The predicted values are in good with the experimental results.