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为研究钢框排架-消能支撑结构的抗震性能,以某钢结构火电厂主厂房为原型并采用防屈曲支撑作为消能装置,设计了1榀5层的钢框排架-消能支撑结构试件.通过低周往复加载试验,分析其破坏机制、滞回性能、刚度退化规律、层间变形及防屈曲支撑耗能能力.试验结果表明:钢框排架-消能支撑结构具有较高的抗侧刚度及承载能力.模型试件滞回曲线呈饱满的梭形,等效黏滞阻尼系数达0.262,位移延性系数超过3.53,表现出良好的耗能及延性性能.试验过程中,防屈曲支撑可在较小加载位移时先于主体梁柱进入屈服且塑性耗能特征明显,增加了结构阻尼且耗能稳定,有效提高了结构抗震性能.
In order to study the seismic performance of the steel frame-energy dissipating support structure, the main plant of a steel-structure thermal power plant is prototyped and the buckling-proof support is used as energy dissipation device. The specimens were tested by low cycle reciprocating loading to analyze the failure mechanism, hysteretic behavior, stiffness degradation, interlayer deformation and energy dissipation of buckling braces.The results show that the steel frame-energy dissipating support structure High lateral stiffness and bearing capacity.The hysteresis curve of the model specimen was full spindle shape, the equivalent viscous damping coefficient was 0.262, the displacement ductility coefficient was over 3.53, which showed good energy dissipation and ductility.In the experiment, The buckling brace can enter the yield before the main beam and the plastic energy dissipation characteristic is obvious when the load is small, which increases the structural damping and stabilizes the energy dissipation, and effectively improves the seismic performance of the structure.