Experimental Study on Compressive Performance of CHS T-Joints Filled with High-Water Rapid-Setting Materials

Abstract

In order to study the compressive performance of the CHS joints filled with high-water rapid-setting materials, the comparative test of the branch axial compression of three T-joint specimens of circular hollow steel (CHS) pipes, chord filled with concrete and chord filled with high-water rapid-setting materials were carried out. Differences in the failure mode, stress-strain distribution, ultimate bearing capacity and initial stiffness of the three joints were comprehensively compared. The test results show that the filling of the chord with different materials leads to different failure modes. Filling concrete can significantly improve the bearing capacity of the joint, but it will reduce the ductility of the joint; the failure mode of the filled with high-water rapid-setting materials is similar to that of the CHS T-joint. The joint show good ductility during the stress process, and at the same time, the ultimate bearing capacity is appropriately increased compared with the CHS T-joint.