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为研究预应力钢板箍(Prestressed Steel Jacket,PSJ)约束下RC柱的轴压性能,分析施加横向预应力构件的轴压作用机理,建立了PSJ约束RC柱有限元模型,开展弹塑性数值模拟,并进行试验验证。结果表明,增大箍板预应力能减小约束RC柱竖向裂缝宽度,提高其轴压承载力,但可能减小约束柱的轴向峰值变形。箍板配箍特征值的增加能够显著提高约束RC柱的承载力和变形能力,并改善其破坏模式。由于箍板与RC柱外表面间空隙的存在,预应力钢板箍的拉应变增量要滞后于箍筋的拉应变。
In order to study the axial compression behavior of RC columns under prestressed Steel Jacket (PSJ) constraints and to analyze the mechanism of axial compression applied to transverse prestressed members, a finite element model of RC columns constrained by PSJ was established to simulate elasto-plastic behaviors. And test verification. The results show that increasing prestress of hoop can reduce the vertical crack width of RC columns and increase their axial compressive bearing capacity, but may reduce the axial peak deformation of restraining columns. The increase of the characteristic value of the hoop hoop can significantly improve the bearing capacity and deformation capacity of the confined RC column and improve its failure mode. Due to the existence of the gap between the outer surface of the hoop and the RC column, the tensile strain increment of the prestressed steel hoop lags behind the tensile strain of the hoop.