SEISMIC RESISTANCE PERFORMANCE OF PRESTRESSED REINFORCED FRAME BEAMS ON JOINTS
The frame joints are taken to study the seismic performance of the frame joints after the prestressed rein-forced concrete frame beams. The displacement method is applied to analyze the stress situation of frame nodes after strengthening concrete frame beams with external prestressing technology of diagonal web members. A finite element model is established through ABAQUS, and a three story and two span experimental frame model is organized to veri-fy the numerical simulation results. The results show that the finite element model established by ABAQUS can be used for seismic performance analysis of frame beam nodes strengthened with external prestressing of diagonal web members. Under the action of vertical load, the reinforcement stress in the joint area is relatively reduced, and the ul-timate shear resistance of the joint is improved. Under the action of horizontal load, the concrete of the reinforced frame is seriously damaged by compression compared with the unreinforced frame, especially the beam end extends more than that of the unreinforced frame, which is not conducive to the seismic resistance of the frame joint. There-fore, corresponding technologies should be used to reinforce the node, providing a theoretical basis for the overall re-inforcement of the diagonal member with external prestressing.
concrete structureframe nodeexternal pre-stresstilted belly poles