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设计了一种以CFRP筋用作预应力筋的新型板结构,对预应力CFRP筋混凝土板实现过程中的关键性问题—CFRP筋锚固系统进行了试验研究,并对预应力CFRP筋混凝土板进行室内抗弯性能试验,系统地分析了预应力CFRP筋混凝土板的开裂荷载、极限荷载、CFRP筋应力状态和破坏形态等,结果表明:受拉区配有普通钢筋的无粘结预应力CFRP筋混凝土板的抗弯受力过程大致可分成3个阶段:加载初期的弹性受力阶段,裂缝出现至拉区普通钢筋屈服的弹塑性阶段,CFRP筋主要承拉的变形快速发展破坏阶段;无粘结预应力CFRP筋混凝土板的破坏形式为CFRP筋的低模量导致的变形快速发展,裂缝延伸,有效受压混凝土面积减小导致的混凝土压碎失效;裂缝形态多为等间距的平行裂缝,裂缝初期发展较慢,在普通钢筋屈服后迅速开展。
A new type of slab structure with CFRP tendon is designed as a prestressing tendon. The key problem in the process of realizing the prestressed CFRP tendon concrete slab is studied. The CFRP tendon anchoring system is tested and the prestressed CFRP tendon concrete slab Indoor bending resistance test, the cracking load, ultimate load, stress state and failure mode of CFRP tendon are systematically analyzed. The results show that the unbonded prestressed CFRP tendons The bending process of concrete slab can be divided into three stages: the initial stage of elastic loading, the stage of elastic-plastic stage where the cracks appear in ordinary zone of the tensile zone, the stage of rapid development and failure of the main tensile deformation of CFRP tendons; The failure mode of prestressed concrete slab with CFRP tendons is that the deformation caused by the low modulus of CFRP tendons is rapid development, the cracks are extended and the effective compression concrete area is reduced, which leads to the failure of concrete crushing. The fractures are mostly equidistant parallel cracks, The initial development of cracks is slow, rapid development after the ordinary steel yield.