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通过碱环境下PVC-CFRP管混凝土柱轴压性能试验,分析环境作用、CFRP条带环箍间距等因素对PVC-CFRP管混凝土柱力学性能的影响.结果表明,碱环境下CFRP条带的抗拉强度有一定程度降低、其弹性模量和极限拉应变基本保持不变.碱环境和普通环境下PVC-CFRP管混凝土柱破坏形态相似,试件破坏时,中部的多条CFRP条带被拉断,部分PVC管被压裂,碱环境下试件的破坏过程较短,试件的承载力和变形有不同程度的降低.碱环境下试件的应力-应变关系曲线呈双线形的特点,第一阶段为抛物线,碱环境对其基本没有影响;第二阶段为强化段,随着CFRP条带环箍间距的增加,试件强化段斜率逐渐减小,与普通环境下相比,碱环境下试件强化段斜率略小.
The effects of environmental factors, the spacing of CFRP strip hoop and other factors on the mechanical properties of PVC-CFRP concrete columns were investigated by the tests of axial compression properties of PVC-CFRP concrete columns in alkali environment.The results show that the resistance of CFRP strip under alkali environment The tensile strength of the PVC-CFRP concrete columns is similar to that of the concrete columns in normal environment. When the specimens are damaged, the middle part of the CFRP strips are pulled Some PVC pipes were fractured, the failure process of specimens in alkali environment was short, and the bearing capacity and deformation of the specimens were reduced to some extent. The stress-strain curve of the specimens in the alkali environment showed a bilinear shape , The first stage is a parabola, the basic environment has no effect on it; the second stage is the strengthening section, with the spacing of the CFRP band hoops increasing, the slope of the strengthening section of the specimen gradually decreases. Compared with the normal environment, The slope of specimen strengthening section is slightly smaller in the environment.