Investigations On The Seismic Performance Of Dry Flexible Beam-Column Joint In Reinforced Concrete Frame Structures With Buckling Restrained Brace

Compared with the cast-in-place structure,the assembly structure has the advantages of high production efficiency and environment friendliness.In recent years,it developed rapidly.The advantages of the assembly structure are beyond doubt.The node is so critical in assembly structure that it is of importance to explore the performance of the connection areas.Based on the research on the frame-beam joints in assembly frame and the braced frame of the at home and abroad,this paper proposes a double-type anti-lateral force system composed of the mement frame and the BRBF with the flexible joints.Furthermore,focused on the performance of flexible nodes,the main contents are as follows:(1)Under the horizontal load,the pushover of the dual-system was analysed by SAP2000 to study the mechanical performance of the flexible joint and the force transmission path at the node.(2)A beam-to-column dry-type joint was proposed,which can be flexibly connected and can be replaced and inspection easily,.The cyclic loading tests of five fabricated frame joints and one cast-in suit joint were completed.(3)The influence of the hole form and BRB bearing capacity on the stress and failure modes of the joints is investigated and compared with the cast-in-place nodes.Through the above research,the main conclusions are as follows:(1)The flexible joint will bear a certain axial force,the axial force is about BRB component in the direction of the beam.(2)The dry beam-to-column flexible joint has great deformation ability,which can meet the requirements of seismic design.(3)Compared with the cast-in-suit specimen,the failure mode of the dry node is helpful to protect the main structure.The design method of the node is reasonable.The dry joint do not have significant local damage within the permissible inter-layer displacement.(4)Concrete slabs can significantly increase the rigidity and bearing capacity of the flexible joint,which need to be considered in the design.When considering the slabs,the carrying capacity of the flexible joints is about half of the cast-in-place specimen.This node has the properties of semi-rigid characteristics.(5)When the interlayer displacement angle is less than or equal to 1/50,the use of circular or oblong holes in the flexible joints has little effect on the overall structure.Therefore,the oblong hole is unimportant in the practical application.