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通过4根表层内嵌入不同FRP筋加固连续梁试件的静载试验,研究了试验梁的弯曲性能,借助通用有限元分析软件分析了影响试验梁承载力的混凝土强度、初始荷载、FRP筋弹性模量与配纤率等因素。分析结果表明:FRP筋与混凝土之间未发生剥离破坏,加固效果显著;与未加固梁相比,加固梁屈服荷载与极限荷载提高幅度分别可达31%、56%;随着混凝土强度、FRP筋弹性模量与含纤率的提高,加固梁屈服荷载与极限荷载提高幅度分别可达38%、17%;随着初始荷载的增大,加固梁屈服荷载与极限荷载降低幅度分别可达6%和24%;试验梁屈服荷载模拟值与试验值的平均比值为0.969,极限荷载模拟值与试验值的平均比值为0.962,钢筋屈服时跨中挠度模拟值与试验值的平均比值为1.104,梁破坏时跨中挠度模拟值与试验值的平均比值为1.024,荷载-挠度模拟曲线与试验曲线走势基本一致,这说明有限元分析结果与试验结果吻合较好,有限元法可以较好模拟试验梁的力学性能。
The bending behavior of the test beam was studied by means of four static specimens with different FRP bars embedded in the surface. The strength of the concrete, the initial load and the elasticity of the FRP tendon were analyzed by using the general finite element analysis software. Modulus and with the fiber rate and other factors. The results show that there is no peeling failure between FRP bars and concrete and the reinforcement effect is remarkable. Compared with the unrestressed beams, the yield strength and ultimate load of the reinforced beams can reach 31% and 56% respectively. With the concrete strength, FRP The elastic modulus and the fiber content of the reinforcement increased, the yield strength and ultimate load of the reinforced beam increased by 38% and 17%, respectively. With the increase of the initial load, the yield and ultimate load of the reinforced beam decreased by 6 % And 24% respectively. The average ratio between the simulation value and the test value of the yield strength of the test beam is 0.969, the average ratio of the ultimate load simulation value to the test value is 0.962, and the average ratio of the simulation value of the midspan deflection to the test value during yielding is 1.104. The average ratio of the mid-span deflection mid-span deflection to the test value is 1.024, and the load-deflection curve is in good agreement with the test curve. This shows that the FEA results are in good agreement with the experimental results and the FEA method can simulate the test Beam mechanical properties.