论文部分内容阅读
通过试验研究了碳纤维增强复合材料(CFRP)筋在活性粉末混凝土(RPC)中粘结应力沿埋长的分布,得到了CFRP筋在RPC中的应力-应变关系、荷载-滑移关系以及粘结应力沿埋长的分布曲线,并建立了粘结应力的位置函数计算式。在试验研究的基础上,从粘结锚固性能的平衡方程、变形方程以及本构方程出发,推导了粘结应力、CFRP筋轴向应力、滑移量以及位置函数等锚固变量沿锚长分布的理论计算公式。结果表明:粘结应力和CFRP筋应力沿埋长分布的实测曲线与理论推导预测曲线吻合较好,理论推导具有可行性;CFRP筋轴力沿埋长线性增加;CFRP筋在RPC中的粘结应力沿埋长分布较为均匀;钢套筒的存在使得粘结应力分布趋向于更加均匀;混凝土抗压强度和CFRP筋直径越大,粘结应力沿埋长分布越均匀;锚固长度越大,粘结应力沿埋长分布越不均匀;弹性模量越大,粘结应力沿埋长分布越均匀,且以CFRP筋的弹性模量对粘结应力分布的影响最大,钢套筒的弹性模量次之,混凝土的弹性模量最小。
The distribution of the bond stress along the length of the CFRP reinforcement in RPC was experimentally studied. The stress-strain relationship, load-slip relationship and bond of the CFRP reinforcement in RPC Stress along the length of the distribution curve, and the establishment of the bond stress position function formula. Based on the experimental study, the anchoring variables such as the bond stress, axial stress, slippage and position function of CFRP tendons are deduced from the equilibrium equations, deformation equations and constitutive equations. Theoretical calculation formula. The results show that the measured curve of bond stress and CFRP tendon stress distribution along the buried length distribution is in good agreement with the theoretical predictive curve, and the theoretical derivation is feasible. The axial force of CFRP tendons increases linearly along the buried length and the bond of CFRP tendons in RPC The distribution of stress along the buried length is more uniform; the existence of steel sleeve makes the bond stress distribution tend to be more uniform; the compressive strength of concrete and CFRP tendons diameter, the distribution of bond stress along the buried length more uniform; The distribution of stress is more inhomogeneous along the burial length. The larger the elastic modulus, the more uniform the distribution of the bond stress along the length of the burial. The elastic modulus of the CFRP tendon has the greatest effect on the distribution of the bond stress. The elastic modulus of the steel sleeve Secondly, the minimum elastic modulus of concrete.