Seismic Performance Of Reinforced Joints Connecting Square Tubular Column And H-beam

Concrete-filled steel tubular structure has many advantages in steel-structured housing,as a common structural form.Vigorously developing concrete filled steel tubular structure has a tremendous role in promoting housing industrialization.Throughout ancient and modern times,although there are many types of concrete filled steel tubular column-H-shaped steel beam joints,most of them are complex in structure.Common diaphragm joints still have some limitations,which bring more inconvenience to construction and structural design.On this basis,this paper presents a new type of joint: concrete filled steel tubular column-H-shaped steel beam-column wall reinforced joint,which has clear force,simple structure and convenient construction.Quasi-static tests were carried out on four specimens of concrete-filled steel tubular column-H-shaped steel beam-column wall strengthened joints and two specimens of hollow steel tubular column-H-shaped steel beam-column wall strengthened joints.The load-displacement curves,strain and displacement data of the specimens are obtained through experiments.On this basis,the skeleton curves and stiffness degradation curves of the new joints are obtained with the core shear angle of the joints.The bearing capacity and seismic performance of the joints are analyzed,and the specific effects of changing parameters on the seismic performance of the joints are analyzed.Through the analysis of strain data,the stress mechanism in the joint area is obtained and the rationality of the local thickness of the column wall in the joint area is verified.The rationality of the connection mode is verified according to the relevant specifications.On the basis of previous studies and combined with experimental phenomena,the stress mechanism of the joints is analyzed.By using the equilibrium equation,the plastic hinge theory and the virtual work principle,the formula of the tensile yield bearing capacity of the column flange under the condition of considering the axial compression ratio of the new joints is deduced,and the formula of the bending yield bearing capacity of the joints is further obtained.The comparison and analysis with the experimental results are made.This paper summarizes the research results of shear capacity of joints,and puts forward some suggestions for the design of shear capacity of joints based on the test results.The ABAQUS finite element model was established for the six test specimens,and the simulation results were compared with the test results to verify the test.After that,based on the original model,the parameters of some models are changed,and the finite element multi-factor analysis is performed to supplement the experimental research content.