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通过分析6根高强连续螺旋箍筋约束混凝土柱在低周反复荷载作用下的滞回性能,获得了各构件破坏时的累积滞回耗能.运用修正Park-Ang模型计算高强连续螺旋箍筋约束混凝土构件在不同位移角下的损伤指数,对柱全过程损伤趋势进行研究,发现:修正Park-Ang模型的计算结果能合理地反映不同参数的高强连续螺旋箍筋约束混凝土构件的损伤发展过程,并与试验结果一致;在高轴压下,无论高强连续螺旋箍筋约束混凝土装配式柱还是现浇式柱在模型中的耗能因子都大于0.037,在1/50位移角下的损伤指数计算值都小于0.7.由于具有很好的延性,高强连续螺旋箍筋约束混凝土柱的轴压比限制可以进一步放松.
By analyzing the hysteretic behavior of six concrete columns subjected to high-strength continuous helical stirrup restrained by low-cycle cyclic loading, the cumulative hysteretic energy loss of each component during failure was obtained. The modified Park-Ang model was used to calculate the restraint of high-strength continuous spiral stirrups The damage index of concrete members under different displacement angles is studied. The damage trend of the whole column is studied. The results show that the modified Park-Ang model can reasonably reflect the damage development process of high-strength continuous spiral stirrup restrained concrete members with different parameters, Which is in good agreement with the experimental results. Under high axial compression, the energy dissipation factor of both the fabricated and the cast-in-place columns with high strength continuous spiral stirrups is larger than 0.037 and the damage index at 1/50 displacement is calculated Values are less than 0.7 due to good ductility, high-strength continuous spiral stirrup constrained axial compression ratio of concrete columns can be further relaxed.