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针对碳纤维增强复合材料(CFRP)筋粘结型锚固系统,采用数值分析研究了不同锚具内壁与锚固胶体间的摩擦系数、不同锥形倾角、锚具前端有无直筒过渡段及有无端堵约束对筋材应力状态的影响,找出了筋材在靠近锚具端部发生破坏的原因,提出了相关强度分析方法及锚固改进方法,并用试验结果验证了方法的有效性。分析结果表明:筋材在摩擦系数为0.7时受到的径向挤压应力峰值只有摩擦系数为0.3时受到的径向挤压应力峰值的45.01%;随着锥形倾角增大,CFRP筋在锚具锥段所受的径向挤压应力峰值逐渐减小,所受剪应力峰值逐渐增大;在锥段末端增设直筒过渡段可以缓解筋材所受到的径向挤压应力与剪应力峰值,缓解系数分别为76.78%与52.90%;端堵约束的存在使锚具端部应力集中现象明显,导致筋材在锚具端部发生破坏。
A numerical analysis was conducted to study the friction coefficient between different anchors’ inner wall and anchoring colloid, different taper inclinations, whether there is a straight transition at the front of an anchorage or whether there is a restraint of restraint on the front of the anchorage system of carbon fiber reinforced composite (CFRP) The influence of tendons on the stress state of tendons is analyzed. The reason why the tendons break down near the ends of anchors is found out. Relevant strength analysis methods and anchoring improvement methods are proposed. The experimental results show the effectiveness of the method. The results show that the peak value of radial compressive stress of the tendons under the friction coefficient of 0.7 is only 45.01% of that of the radial compressive stress at the friction coefficient of 0.3. As the taper angle increases, The peak value of radial compressive stress on conical section gradually decreases and the peak value of shearing stress increases gradually. The addition of straight section at the end of conical section can relieve the radial compressive stress and the peak value of shear stress, The coefficient of mitigation is 76.78% and 52.90% respectively. The existence of end-plug constraint makes the stress concentration on the end of anchorage obvious, which leads to the destruction of tendons at the end of anchorage.