碳纤维网格加固超载梁抗弯性能试验

Flexural properties of overloading of concrete beam strengthened by carbon fiber net

为研究碳纤维网格加固不同幅值下超载梁的工作性能,本试验分别对5根超载梁进行了抗弯试验。以不同加载幅值、加固方式为变量,从试验的破坏形态、挠度变化、应变分析、裂缝的发展与分布、抗弯承载能力、混凝土和钢筋应变等,分析了碳纤维网格加固超载梁的性能。试验结果表明:超载幅值大小、加固方式和加固量都会影响梁的极限承载力、抗弯刚度和挠度、裂缝的发展和分布;在有限次超载作用下,桥梁构件的承载力提高,随着超载幅值的增大,受损严重的梁加固效果不如轻微或者中度超载梁的明显。

In order to study the performance of beams strengthened with carbon fiber net(CFN)suffered by different amplitudes overloaded,overloaded bending tests were carried out on five beams.The loading amplitudes and strengthening methods were tested.The failure modes,deflection changes,strain caricaturist,crack development and distribution,flexural bearing capacity,strain of concrete and reinforcement were analyzed.The results show that the overload amplitude,reinforcement method and reinforcement amount have significant effect on the ultimate bearing capacity,flexural stiffness and deflection,and the development and distribution of cracks.The bearing capacity of bridge components is not reduced suffered by limited overload.The reinforcement effect of beams damaged by high overload amplitude is poorer than that of beams with slight or moderate overload.