分段控制型钢支撑抗震性能试验研究OA

To address the issues of compressive buckling in traditional steel braces and the structural complexity and performance instability of buckling-restrained braces,a segmentally controlled section steel brace was proposed.This innovative brace consists of energy dissipation sections at both ends and an elastic section in the middle based on the design concept of zonal control.Under rare earthquakes,plastic deformation occurs in the energy dissipation sections to dissipate seismic energy,and the elastic section always remains in an elastic state.Three segmentally controlled section steel brace specimens with different energy dissipation section configurations(unconstrained and constrained)and steel types(Q235 and LYP225 steel)for the energy dissipation section were designed.The failure modes,studied through quasi-static tests.The influence of different configurations and steel types on the seismic performance of this new type of brace was analyzed.The research results show that the specimen made of Q235 steel has the highest bearing capacity but the most significant stiffness degradation.The brace specimens with external constraints(U-shaped plates and channel steel)exhibit full hysteretic curves and greatly improved compressive bearing capacity.There is no obvious stiffness degradation under large displacements;demonstrating stable tensile and compressive performance and excellent energy dissipation capacity.The steel type used in the energy dissipation section has little influence on the energy dissipation and deformation capacity of the segmentally controlled section steel brace.