CFRP加固混凝土柱轴压性能尺寸效应试验分析

为了研究碳纤维增强复合材料（CFRP）加固钢筋混凝土柱轴压性能的尺寸效应,设计了3组30根几何相似的CFRP加固钢筋混凝土柱,对其进行了轴心受压破坏试验.试验参数主要包括构件尺寸、钢筋配置和加载方式,研究了CFRP加固混凝土柱在轴压荷载下的破坏形态、极限强度、峰值应力、变形能力和残余变形等性能与构件尺寸的关系.研究结果表明:相同尺寸的CFRP加固钢筋混凝土柱比素混凝土柱的极限强度有不同程度的提高；CFRP加固钢筋混凝土柱的峰值应力随着尺寸的增大,呈先增大后减小的趋势,归一化轴向变形能力和残余变形随着构件尺寸的增加逐渐减小；不同的加载方式对于CFRP加固钢筋混凝土柱的承载力和极限位移影响不大.

Experimental analysis on size effect of axial compressive behavior for reinforced concrete columns strengthened with CFRP

To study the size effect of reinforced concrete columns strengthened with carbon fiber reinforced polymer (CFRP) under axial compression loading, three groups of thirty geometrically similar reinforced concrete columns strengthened with CFRP were designed and tested. Test parameters including column size, reinforcement layout, and loading history were studied, and the relationships between the properties of the proposed columns (such as failure mode, ultimate strength, peak stress, and residual deformation) and column size were investigated under axial compression loading. Experimental results show that with the same size, the ultimate strength of the reinforced concrete columns strengthened with CFRP was higher than that of the plain concrete columns. As the size of the concrete columns strengthened with CFRP increased, the peak stress first increased and then decreased. The normalized axial deformability and residual deformation of the concrete columns strengthened with CFRP decreased with the increase in the size of the columns. Different loading histories had little effect on the bearing capacity and ultimate displacement of the concrete columns strengthened with CFRP.