Performance Research On Reinforced Concrete Beam-column Joint With Steel Support

Seismic disasters are more common in the many natural disasters，many of thestructure was severely damaged in the seismic because of the strength of framestructure node is relatively weak at home and abroad. In order to reduce the disastersof earthquake, the investigators all over the world committed to study the seismicbehavior of the frame joints. Support members can bear axial force, and work togetherwith frame through deformation coordination action of the floor. And the braced framesystem has two advantages: increase the structural stiffness and reduce the shear forceof the weak layer at the bottom of frame, thus the two seismic line of defense areformed. Therefore the braced frame system in application of tall building structure isvery extensive. Although the specification has been taken the appropriate measures inorder to ensure the strength and ductility of the nodes, and a number ofrecommendations of the method of calculating seismic resistant capacity is put forward.But study on detailed of beam-column joints of braced frame system is relatively less,so this paper study on mechanical performance of reinforced concrete beam-columnjoints with steel support by finite element software.The several analyses have done：1. In theoretical knowledge, the failure mode of reinforced concrete beam-columnjoints, shear design and steel connection and anchoring of the joint core zone are firstdescribed in this paper. The various types of calculation of and structural requirementsof embedded parts and center support are described.2. In this paper, the analyses of model is using ABAQUS, reinforced is decryptedby ideal elastic-plastic model and concrete by damage-plasticity model, separatemodeling is used. In order to study the affect of embedded parts to support and joints,the different embedded construction program is particular set up, then choose thescheme which most suitable for this model. And the influence of support for thebeam-column joints is analyzed.3. The beam-column joints with steel support or not are simulated by finiteelement and the stress, strain, and the force of beam are compared. Sequentially theeffect of the mechanical performance of beam-column joints with steel support isin-depth study. Set different axis pressure and the changes of principal compressivestrain and stress distribution of reinforced concrete beam-column joints are studied.The results show that: different structural scheme of embedded have significantimpact on the stress distribution of beam-column joints, cracks, and deformation. Also, the embedded parts have significant impact on static behavior of beam-column joints,on the one hand, the beam cracking position in a location away from the area ofbeam-column joints, is appeared in the edge of embedded parts; another the concrete ofbeam is first cracked and plastic hinge is formed, and effectively prevent the shearfailure of joint core area. Meanwhile, the principal compressive strain and stressdistribution of reinforced concrete beam-column joints has different changes underdifferent axis pressure. The research contents and achievement of this paper has certainreference value in the reinforced concrete beam-column joints with steel supportdesign and construction area.