装配式钢-混凝土组合管剪力墙抗震性能试验与数值分析

Experiment and numerical analysis on seismic behavior of precast SRC composite tube shear walls

为研究装配式钢混凝土组合管剪力墙的抗震性能,完成了5个SRCT剪力墙试件和1个RC剪力墙试件的拟静力试验,分析了其破坏形态、承载能力、变形能力和耗能能力等.采用数值模拟软件建立了SRCT剪力墙有限元模型,并对其进行参数化分析.结果表明:SRCT剪力墙刚度大、承载能力高,约束区混凝土破坏程度低;随着钢板厚度的增大,破坏形态由型钢与钢板撕裂转变为焊缝破坏,建议保证焊接质量以实现预期破坏模式;距墙肢底部500 mm范围的混凝土、U形钢、薄钢板和栓拉筋受力复杂,应采取措施提高墙体承载与变形能力;随着轴压比、混凝土强度和钢材强度的提高,SRCT剪力墙承载力和刚度也逐渐增大,但延性降低;建议轴压比不宜大于0.5,混凝土强度不宜高于C50,钢材强度等级不宜大于Q390.

An experimental program consisting five precast steel-concrete composite tube(SRCT)SRCT shear wall specimens and one RC shear wall specimen was conducted under low cycle load to evaluate the seismic behavior of the SRCT shear wall.The failure mode,bearing capacity,deformation capacity,and energy dissipation capacity of the test specimens were analyzed.The finite element model of the SRCT shear wall was established by numerical simulation software,and the parametric analysis was carried out.The results show that the SRCT shear wall has high stiffness and bearing capacity,and low degree of concrete damage in the restraint area.With the increase of the thickness of the steel plate,the failure mode changes from the tearing of shape steel and the steel plate to the failure of the connection weld.It is recommended to ensure the welding quality to achieve the expected failure mode.The concrete,U-shaped steel,thin steel plate,and the rebar with stud and tie function in the range of 500 mm from the bottom of the SRCT wall are subject to complex force,and measures should be taken to improve the bearing and deformation capacity.With the increase of the axial compression ratio,the concrete strength and the steel strength,the peak bearing capacity,and the initial stiffness of the SRCT shear wall increase,but the ductility decreases.It is recommended that the axial compression ratio should be less than 0.5.The concrete strength and the steel strength should be restricted under C50 and Q390,respectively.