EXPERIMENT STUDY AND FEM ANALYSIS OF THE COMPOSITE STRUCTURE COMPOSED BY STEEL BEAM AND CONCRETE GIRDER

摘要

A new composite structure which is composed by steel beam and concrete girder is introduced in fuel electric plant construction recent years. In this structure, the profile steel is inserted into the concrete girder as the secondary beam to bear the loads. To get the failure mechanism and static behaviors, two scale models of an actual project were designed and tested. The failure mode, ultimate bearing capacity and deformation were tested and analyzed. Finite element models were built and analyzed. The analytical and experimental results indicate there are two failure modes of this structure, the first one is the concrete girder damaged by shear occurred when the height of concrete girder is low, and the other one is steel beam destroyed by bending. Size of anchor bar and width of ends of steel beam have small influence on the bearing capacity. According to the results, an easy method to calculate the loads of serviceability limit states is presented.