轴向受压CFRP管混凝土柱的膨胀模型及应力-应变关系

Dilation model and stress-strain relationships of CFRP tubes confining concrete columns under axial compression

在实验基础上,建立了CFRP管混凝土柱的轴向压缩膨胀模型。利用膨胀模型计算的紧箍力变化规律和主动侧限混凝土柱的轴向压缩本构模型,结合多轴应力下的混凝土破坏准则,推导出被动侧限混凝土柱轴向压缩应力-应变关系理论表达式。根据各组份材料性能、含量、轴向压缩荷载作用下各组份的应力状态及变形协调条件,建立了CFRP管混凝土柱轴向压缩本构关系。实验结果证明,理论预测结果与实验值吻合良好。

Based on experimental results, a dilation model of CFRP tubes confining concrete columns under axial compression is set up. By use of the calculating variation regulation of confining pressure from the dilation model, the constitutive model of axial compression of active confinement concrete columns and the failure criterion of concrete under multi-axial stress, the theoretical expression of stress-strain relationships of axial compression for the passive confinement concrete columns is derived. According to the properties, the contents, the stress distribution under axial compression of every component and the deformation equations, the constitutive relationships of CFRP tubes confining concrete columns under axial compression are found. The experiments demonstrate that the predicted results of the theory are quite identical with the experimental results.