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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。
In order to study the flexural behavior of reinforced concrete beams strengthened with flax fiber reinforced plastic (FFRP), four kinds of natural fiber fabrics and three kinds of thickness FFRP specimens were tested on the basis of tensile test. The four-point bending load test was carried out, and the failure mode, load-deflection curve and ultimate bearing capacity of the test beam were discussed. According to the most common failure mode of reinforced concrete beams strengthened by FFRP, The calculation formula is deduced. The results show that the FFRP tensile properties of 300g · m-2 ramie linen fabric are stable. The ultimate bearing capacity and ductility of FFRP reinforced beams are all improved to some extent compared with ordinary reinforced concrete beams. The formula of flexural capacity The values are in good agreement with the test values and are safe, which can provide the basis for the design of such reinforced beams.