全玻璃纤维增强树脂筋混凝土电缆排管的抗弯试验

Experimental study on flexural performance of concrete cable duct reinforced with glass fiber reinforced polymer bars

提出了采用全玻璃纤维增强树脂基复合材料(GFRP)筋混凝土电缆排管代替传统的钢筋混凝土电缆排管,该结构形式具有减少能耗的优点。通过对小尺寸和足尺GFRP筋混凝土电缆排管试件进行抗弯性能试验,研究其抗弯能力、变形及破坏特征等。试验结果表明,GFRP筋混凝土电缆排管具有与普通钢筋混凝土梁相似的力学特征,以混凝土开裂为分界点,位移-荷载曲线表现为双线性,排管侧面拉应力分布不均匀,部分区域出现了较高拉应力。提出了GFRP筋混凝土电缆排管的抗弯设计计算方法,理论计算结果与试验测试结果较为吻合。

A concrete cable duct reinforced with glass fiber reinforced polymer（GFRP）bars was proposed.The newly developed cable duct is capable of reducing the energy dissipation and can be used to take place of traditional concrete cable duct which is reinforced with steel bars.The bending tests were conducted for several small and full size specimens of GFRP concrete cable duct and the bearing capacity of bending,deformation and failure characteristics were investigated.It is found that the mechanical characteristics of the GFRP concrete cable duct are similar with that of the concrete cable reinforced with steel bars.The loading-deflection curve is bi-linear with a cut-off point corresponding to the cracking of the concrete.The distribution of tension stresses on the side of the cable duct is not uniform and relatively high tension stresses are detected in some local regions.An appropriate calculation and design method was presented to capture the flexural capacity of the GFRP concrete cable duct.The theoretical predictions agree well with the experimental results.