Numerical procedure for nonlinear behavior analysis of composite slim floor beams

•Develop a design procedure for composite slim floor beams.•Propose a method to evaluate the flexural behaviors of composite slim floor beams.•Propose and verify models for predicting the moment-deflection relationship for composite slim floor beams.•Models showed good agreement with test results.

A design procedure is developed for composite slim floor beams. Based on cross-sectional analysis, the flexural properties of the slim floor beams are evaluated in terms of the plastic and yield moment resistances. The moment–curvature/deflection models are proposed and are verified by the available test results of composite slim floor beams. The nonlinearities of materials and the composite action at the interface of the steel and concrete components are considered in the prediction of the nonlinear behavior of the beams. Parametric studies are conducted to investigate the likely influences of material strengths and various geometric properties on the performance of the beams. The design procedures developed herein are validated by comparing the existing test results presented in literature. The computational results are found to agree well in both the elastic and plastic ranges, as compared with the test results.