GFRP筋混凝土板抗弯性能试验研究

Experimental Study on Flexural Behavior of GFRP Reinforced Concrete Slabs

为了研究GFRP筋混凝土板抗弯性能及承载能力计算方法,对GFRP筋混凝土板进行抗弯性能试验研究.通过改变GFRP筋混凝土板的混凝土强度和配筋率,对比分析了混凝土强度和配筋率对板的变形和承载能力影响.基于平截面假定、平衡条件及变形协调条件,推导了GFRP筋混凝土板抗弯承载力的计算公式,并通过试验结果验证了承载能力计算公式的正确性.试验结果表明:荷载挠度曲线呈现明显的双直线,配筋率对初裂荷载影响较小,横截面服从平截面假定,裂纹分布稀疏且宽度大,抗弯承载能力系数处在1.02~1.36之间,验证了ACI中1.4倍平衡配筋率的局限性,对以后的GFRP筋混凝土板的设计具有一定的工程借鉴意义.

In order to study the flexural behavior and computing method of bearing capacity of GFRP reinforced concrete slabs,experimental study on flexural behavior of GFRP reinforced concrete Slabs is conducted.By changing the concrete strength and reinforcement ratio of GFRP reinforced concrete slabs,the effects of concrete strength and reinforcement ratio on the deformation and bearing capacity of concrete slabs are compared and analyzed.Based on the assumption of plane section,equilibrium condition and deformation coordination condition,the calculation formula of flexural capacity of GFRP reinforced concrete slab is derived,and the correctness of calculation formula of bearing capacity is verified by test results.The test results show that the load deflection curve presents obvious double straight line,the reinforcement ratio has little effect on the initial crack load.The cross section is assumed from the plane section and the crack distribution is sparse and the width is large.The flexural carrying capacity coefficient is between 1.02 and 1.36.The limitation of 1.4 times equilibrium reinforcement ratio in ACI is verified,which could be used as references for the future design of GFRP reinforced concrete slabs.