STUDY ON TRANSMISSION MECHANISM OF VERTICAL LOAD THROUGH H-SHAPED STEEL BEAM TO LARGE DIMENSION CFST COLUMN

In order to study the transmission mechanism of vertical load through H-shaped steel beam to large dimension CFST column, it proposes a foundation beam model based on the Winkler foundation Timoshenko beam theory, which can represent typical joint configuration. With the boundary conditions, the analytic solution of vertical load distribution is obtained. This foundation beam model is also used to investigate the effect of different configuration on vertical load transmission because of the good agreement between the analytical results and finite element analysis results. It is shown that the composite configuration of the inner-ring plate and anchor plate enables the concrete to bear more vertical load compared with the configuration of the inner-ring plate only. Furthermore, the thickness of the vertical stiffness plate and the concrete strength have a positive influence on the bearing load of the concrete from the parameter analyses; and through multiple regression analysis, the relationship of load ratios of steel tube and concrete is also put forward. It is expected to provide guidelines for the design of the joint with H-shaped steel beam and large dimension CFST column.