CFRP约束轴压预压混凝土的峰值应变预测

The Peak Strain Forecast of CFRP Constrained Preloaded Concrete under Uniaxial Compressive Force

对CFRP约束预压混凝土的轴压性能试验进行研究,并对混凝土的峰值应变的影响因素进行分析。结果发现,对于CFRP约束预压混凝土,峰值应变的主要影响因素可归结为等效圆柱约束刚度Er,混凝土弹性模量Ec和预加轴压比B三个因素。参考已有峰值应变模型,结合参数分析,对已有峰值应变模型进行改进,提出CFRP约束轴压预压混凝土的峰值应变预测模型,为CFRP约束预压混凝土的应力-应变模型的参数确定提供计算方法。

In this paper,the test of CFRP constrained preloaded concrete under uniaxial compressive force was carried on and the factor effecting peak strain was analyzed at the same time.After the analysis,it was found that： the main factors affecting the peak strain can be attributed to three factors of the equivalent cylinder constraint stiffness E r,elastic modulus of concrete E c and pre plus axial compression ratio B.Meanwhile,by referring to the existing model,integrating the parameter analysis and improving the former model,the forcasting model of peak strain of CFRP constrained preloaded concrete was put forward,which can provide reference for the calculating methods of the parameters in stress-strain model of CFRP constrained preloaded concrete.