Research On Mechanical Behavior Of RC Beam To STCC Column Joints

The joint is very important as the key part to connect the beam and column. Reinforced concrete (RC) beam to steel tube confined concrete (STCC) column connections is a new form of the joint. It has important theoretical and practical value to study the mechanical performance and design method of this joint.The mechanical performance of reinforced concrete (RC) beam to (STCC) column connection is investigated in this paper. The main achievements can be summarized as follows:(1) A solid model is carried out to simulate the reinforced concrete (RC) beam to (STCC) column connection using the nonlinear finite element program ABAQUS. The model was verified valid by comparing with a large number of experimental results. The whole process analysis of the joint under monotonic loading was carried out to further investigate the working mechanism of the joint and the stress distribution and mechanism of joint parts.(2) Parametric analysis was performed to investigate the moment-rotation relationship of the reinforced concrete (RC) beam to (STCC) column connection. The concrete compressive strength and the steel ratio of the joint area, the yield strength (yield point) of the rebar and steel of the joint area, the axial compression ratio, the yield bending moment of steel beam to column, the beam to columns line stiffness ratio, and the slenderness ratio were considered as parameters. The influence of parameters to the flexural capacity of the joint was received. A simplified formula of flexural capacity of the joint was proposed based on the parameter analysis.(3) Parametric analysis was performed to investigate the shear-deformation relationship of the reinforced concrete (RC) beam to (STCC) column connection. The concrete strength and steel yield strength of the joint region, the thickness of steel web, stirrup ratio, and the axial compression ratio were considered as parameters. The yielded shear strength formula was proposed.(4) Some constructional suggestions of reinforced concrete (RC) beam to (STCC) column connection are supplied.