Research On The Connecting Method And Mechanical Behavior Of Beam-column Joints In Structural Reconstruction

Due to the use changing, structure load adding, and functional requirements increasing, the existing buildings need to be strengthen and transformed. The new beam-column joints will always be formed by adding new components or supporting system to change the integral structure force transmission system. In view of the destruction of reinforced concrete frame mainly concentrating on the joint ,the research on the connecting method and the mechanical properties of the joints in structural modification has important theoretical significance and application value.By analyzing the force mechanism of the frame beam-column joints, the connecting method by adding bonded rebar is proposed. Based on the proposed method ,four reconstruction beam-column joints specimens were made considering the different bar diameter and anchorage anchorage layout. Though the static loading test and finite element numerical simulation analysis, three conclusion are made:(1)the additional bonded rebar can delay the crack expanding to improve the integrity of modified beam-column joints; (2) the additional bonded rebar can change the location of plastic hinge formation, and then avoid the occurrence of node failure;(3) the additional bonded rebar can improve the bearing capacity of beam-column joints.The research above has certain reference for the further study on the connecting methods and mechanical properties of reconstructive beam-column joints ,and can also perfect the criterion about the design of the concrete reinforcement and reconstruction, witch are available for the design and construction of concrete structure reconstruction project...