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在结构中合理安装自复位屈曲约束支撑可以有效地减少结构损伤和结构残余变形。该文提出了一种新型三套管自复位屈曲约束支撑,对其滞回性能进行实验研究。通过拟静力试验考察了初始预应力,芯材管有效横截面积对支撑耗能能力以及控制残余变形效果的影响。采用有限元方法对支撑的滞回性能进行了参数分析,并通过理论推导给出了支撑的刚度和承载力计算公式。研究结果表明合理设计的三套管自复位屈曲约束支撑具有良好的耗能能力和自复位性能,有限元分析结果与试验结果吻合较好,理论推导得到的刚度和承载力计算公式能准确给出支撑滞回曲线上的特征点。
Reasonable installation of self-restoring buckling restraint brace in the structure can effectively reduce structural damage and structural residual deformation. In this paper, a new type of self-restoring buckling restraint brace with three sleeves is proposed, and its hysteretic behavior is experimentally studied. The effect of initial prestress, the effective cross-sectional area of the core tube on the support energy dissipation capacity and the residual deformation control effect were investigated by quasi-static tests. The hysteretic behavior of the brace is analyzed by finite element method. The stiffness and the bearing capacity of the brace are calculated by theoretical derivation. The results show that the reasonably designed three-tube self-restoring buckling restrained brace has good energy dissipation capacity and self-resetting performance, and the finite element analysis results are in good agreement with the experimental results. The formulas for calculating the stiffness and bearing capacity theoretically can be given accurately Support hysteresis curve feature points.