Abstract
In this study, a new joint of concrete-filled rectangular steel tube column was proposed and analyzed. The force transmission components include distribution beams and inner periphery ribs in the floor node area. The stress behavior of the new proposed concrete-filled rectangular steel tube column under axial compressive load was investigated. It was found that the force transmission components coordinate the force and deformation of external steel tube and internal concrete. This indicates that the steel tube and concrete can work together to bear external load. Our previous test results also show that arranging force transmission components in the floor node area can improve the mechanical behavior of a concrete-filled rectangular steel tube column. Finally, a design method of force transmission component distribution beam is proposed, which provides a reference for the structural designer to use the new concrete-filled rectangular steel tube joint in actual engineering.
Highlights
Large-section concrete-filled rectangular steel tube (CFRT) columns have been widely used,[1,2] which is very important for the safety of the entire structure
The results show that through the transmission force components the external load applied to the steel tube wall can be effectively passed to core concrete, which ensures that the core concrete participates in the stress redistribution
In order to obtain the stiffness of each component part of CFRT column accurately, it is very important to accurately simulate the mechanical behavior among the distribution beams, the steel pipe wall, and the core concrete
Summary
Large-section concrete-filled rectangular steel tube (CFRT) columns have been widely used,[1,2] which is very important for the safety of the entire structure. The transmission force components, that is, distribution beams and inner periphery ribs are set at the floor node zone to coordinate the deformation between steel tube and concrete. The inner periphery ribs, setting on the upper and lower flange height of distribution beams, are the secondary transmission force components, and are the main transmission force components that can coordinate the deformation and force of steel tube and internal concrete to bear the external load together. The CFRT column can achieve synergistic work well, and the bearing capacity increases greatly It is a reliable, effective, reasonable, and economical method to install the transmission force components in the steel tube at the floor joint zone. In order to obtain the stiffness of each component part of CFRT column accurately, it is very important to accurately simulate the mechanical behavior among the distribution beams, the steel pipe wall, and the core concrete. The vertical spring stiffness of concrete is obtained with equation (19)
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