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通过对含有屈曲约束支撑的框架进行振动台试验,研究了屈曲约束支撑对结构地震反应的减震效果。选用3条天然波和1条人工波进行加载,记录了模型的加速度反应,分析了BRB在试验中的力学性能,并与理论计算值进行了对比,研究了台面输入加速度为0.6g和1.0g时框架底层BRB的滞回曲线。探讨了不同台面输入下输入能量在模型中的分布情况。试验及研究结果表明,当台面输入加速度小于0.6g时,屈曲约束支撑可以为结构提供稳定的侧向刚度;当台面输入加速度大于0.6g时,屈曲约束支撑通过自身塑性变形来吸收能量;当台面输入加速度为1.0g时,屈曲约束支撑可以吸收台面输入的20%~40%的能量。
The shaking table test of the frame with buckling restraint support was used to study the damping effect of the buckling restraint brace on the seismic response of the structure. Three natural waves and one artificial wave were selected for loading. The acceleration response of the model was recorded. The mechanical properties of BRB were analyzed and compared with the theoretical calculation. The results show that the input acceleration of the platform is 0.6g and 1.0g Hysteresis curve of the bottom BRB of the frame. The distribution of input energy in the model under different table inputs is discussed. The experimental results show that the buckling restrained brace can provide a stable lateral stiffness for the structure when the input acceleration is less than 0.6g. When the input acceleration is greater than 0.6g, buckling restrained brace absorbs energy through plastic deformation. When the surface acceleration is less than 0.6g, When the input acceleration is 1.0g, the buckling restraint support can absorb 20% ~ 40% of energy input from the mesa.