全螺栓预应力格构钢加固震损RC柱抗震性能试验研究OA

To improve the strengthening effect and construction efficiency of the traditional encased steel reinforcement method,a novel encased steel reinforcement method was proposed,which utilized special-shaped lattice steel instead of conventional angle steel,combined with prestressing technology and full bolt connection method.Quasi-static tests were conducted on unreinforced damaged column,angle-steel-reinforced column,fully bolted latticed steel-reinforced column,and fully bolted prestressed latticed steel-reinforced column,and seismic performance indicators such as failure modes,hysteresis curves,skeleton curves,stiffness degradation,and energy dissipation capacity were obtained.The results show that the prestressed lattice steel can more effectively confine concrete deformation and reduce crack development.After strengthening,the ultimate load of the column increases by 81.04％,the displacement ductility coefficient increases by 89.31％,the energy dissipation capacity increases by 151.85％,and the initial stiffness increases by 65.73％,demonstrating significant advantages over the traditional angle steel strengthening method.The mechanism involves bi-directional compression in the concrete and tensile forces in the external steel components.By applying additional stress,the strength and stability of the material are improved,and the overall collaborative working ability between the external steel components and the strengthened components is significantly enhanced.