全GFRP筋混凝土电缆排管的抗剪承载力

对全玻璃纤维增强聚合物复合材料（GFRP）筋混凝土电缆排管的抗剪性能进行了研究。在比较分析各国规范基础上，提出了GFRP筋混凝土电缆排管的抗剪设计计算方法。通过小尺寸和足尺GFRP筋混凝土电缆排管试件抗剪试验，得到了裂缝开展模式、截面应变分布规律及荷载挠度曲线，揭示了其破坏机制。试验结果表明，抗剪承载力均随面积配箍率和纵筋配筋率增加而增加。配箍率过小时，箍筋作用可忽略。纵筋配筋率较小时，构件仍具有较高的抗剪承载力。所提出的建议公式能满足电缆排管设计中安全性和经济性的要求。

Shear bearing capacity of concrete cable duct reinforced with GFRP bars

The shear performance of the concrete cable ducts reinforced with glass fiber reinforced polymer (GFRP) bars was investigated. An appropriate calculation and design method was proposed based on the different countries' design codes. The crack growth mode, the distributions of the strain on the cross sections and the load-deflection curves were obtained by the shearing test on several small and full size specimens. The failure mechanism was revealed. The experimental results show that the shear bearing capacity increases with the increase of area-stirrup ratio and the longitudinal reinforcement ratio. The effect of stirrup on the shear bearing capacity can be neglected if the stirrup ratio is too small. The specimens still have relatively high shear bearing capacity under a small reinforcement ratio of longitudinal reinforcement. The proposed formula can preferably fulfill the requirements of security and economy for designing or fabricating the concrete cable ducts.