中文摘要：

为研究亚麻纤维增强塑料（FFRP）加固钢筋混凝土梁的受弯性能,在4种自然纤维布和3种厚度FFRP试件拉伸试验研究的基础上,以FFRP层数为参数对3根试验梁进行了四点受弯加载试验,并对试验梁的破坏形态、荷载-挠度曲线和极限承载力进行探讨;依据FFRP加固钢筋混凝土梁的最常见破坏模式,对相应破坏模式下的抗弯承载力计算公式进行了推导。结果表明：300g·m^-2雨露麻亚麻布制作成的FFRP拉伸性能稳定;FFRP加固梁的极限承载力和延性与普通钢筋混凝土梁相比都有不同程度的提高;抗弯承载力公式计算值与试验值吻合良好且偏于安全,可为该种加固梁的设计提供依据。

英文摘要：

In order to study flexural behavior of reinforced concrete beams strengthened with flax fiber reinforced plastic（FFRP）,tensile performance tests of FFRP specimens with four kinds of natural fibers and three kinds of thicknesses were conducted.Based on the test results,four-point flexural loading tests on three beams considering FFRP layer as the parameter were carried out.Failure modes of specimens,load-deflection curves and ultimate bearing capacity were investigated.According to the common failure modes of reinforced concrete beams strengthened with FFRP,the corresponding bending capacity formula was derived.The results show that FFRP made of the 300g· m^-2 rain flax possesses stable tensile properties.Compared with ordinary reinforced concrete beams,ultimate bearing capacity and ductility of beams strengthened with FFRP increase to different extents.The calculation values of bending capacity agree well with the test results,and the results can provide basis for design of this kind of reinforcement beam.