Square Concrete-filled Steel Tubula Column-h-beam Wall Reinforced Typestudy On Seismic Performance Of Joints

Steel housing industrialization has been the focus of attention in recent years,in the implementation of construction efficiency is particularly important.At present,the main forms of joints used in steel structure include: joints with inner diaphragms,joints with through diaphragms and joints with outer diaphragms,which are more complicated in terms of production technology and efficiency.On the basis of grasping and referring to the related research results and combining with the problems existing in the actual production,the joint connecting H-beam and reinforced square tubular column was proposed in this dissertation.Through quasi-static test and finite element analysis,the seismic behavior and mechanics of the column-reinforced joints were studied.The main research was summarized in detail as follows:Four specimens of stiffened beam-column joints in nodal domain were designed and manufactured.Under the same experimental conditions,repeated low-cycle load tests were carried out on all specimens to study the influence of changes in nodal domain column wall thickness on the seismic performance of joints.In the test process,carefully observe the test phenomenon produced by each specimen,and make corresponding test records.The failure process and failure mode were analyzed,and the hysteretic loop curve,skeleton curve,stiffness degradation curve and shear Angle curve of the node core area were further obtained through the test data.The influence of the column wall thickness of the node region on the seismic performance of the node,such as bearing capacity,ductility,stiffness and energy dissipation capacity,was analyzed.The strain gauge data arranged in the joint area were analyzed to obtain the changes of strain values at different positions of the beam and column,obtain the stress mechanism of the joint area,and verify the reasonable value of the height of column wall strengthening area.According to the analysis of the force mechanics and other results,the bearing capacity of the beam-column connection was theoretically deduced.In the analysis of bearing capacity of column plate,two forms of column plate thickening and stiffening were respectively considered.By using plastic hinge theory and virtual work principle,the formulas of local bearing capacity of column plate were obtained,and the calculation results obtained by using the theoretical formula were compared with the test results.The finite element model of two standard joints was established by finite element software ABAQUS.The experimental phenomena,hysteresis curves,skeleton curves and bearing capacity calculated by finite element method were compared with the test results to verify its accuracy.Based on the finite element model,parametric analysis was performed to obtain the effect of the variables on the bearing capacity of the joint.