Stress Response and Initial Stiffness of Side Plate Connections to WCFT Columns

摘要

To study the mechanism of load transfer in double-side-plate connections between I-beams and wall-type concrete-filled steel tubular columns,a pseudo-static experiment and finite element analysis were conducted for two full-scaled specimens.The results revealed that the primary load was transmitted along an S-shaped path in the side plate,and the primary strain occurred in an X-shaped region between the left and right steel beam flanges.The shear force in the steel beam web was transmitted first to the side plate centre and then to the joint area,where the side plate,steel tube web,and concrete all resisted the internal force.Based on principal component methods,a calculation formula was established for initial rotational stiffness that comprehensively considers the influence of the tensions,compression,and shear deformation of the cover plate,side plate,and web.Comparing this formula with an existing model showed that the proposed formula is suitable for new types of side plate joints.Moreover,it can accurately calculate the initial rotational stiffness of the joint,thus providing a reliable basis for future engineering design.