Numerical Simulation of Detailing Requirements to Guarantee Cooperation Between Steel Tube and Concrete in Concrete filled Steel Tubular Columns with Large Rectangular Section

Abstract:

In order to investigate the cooperation property between steel tube and core concrete at the connections between giant transfer beams(or trusses) and mega concrete filled steel tube columns in the extra high buildings, 4 scaled specimens (1∶5) for large rectangular section concrete filled steel tubular (LRCFT) columns with 3 types of detailing requirements under compression load, which was applied directly on the steel tube, were analyzed with ABAQUS. The finite element models adopted in this paper were verified by comparing with the axial compression load vertical displacement curves, percentage curves of the load carried by core concrete ,and the failure modes between FEM’s and experimental results. Based on such verified models, two impact factors, i.e., the width to thickness ratio of the steel tube and the stiffness of distributive beams, were investigated to understand the influence on cooperating behavior between steel tube and core concrete in the LRCFT columns with distributive beams and both distributive beams and inner diaphragms simultaneously. It is shown that the width to thickness ratio of the steel tube have small effect on the cooperation property between steel tube and concrete in the LRCFT columns, however, the cooperation would be improved with the increasing of the distributive beams stiffness.