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采用高延性纤维增强水泥基材料部分代替钢筋混凝土梁受拉区的混凝土得到 ECC/RC 组合梁构件,可以有效提高梁的延性及抗裂性能. 基于平截面假定和材料本构模型,分析组合梁构件在受力过程中各个阶段的截面应力应变状态,得到各阶段承载力的计算方法. 根据混凝土结构设计规范,提出了 ECC/RC 组合梁极限承载力的简化计算方法,并给出了组合梁构件的弯矩-曲率关系,得到组合梁延性的简便计算方法.最后,采用一个组合梁的试验结果对理论公式进行验征. 结果表明: 计算结果和试验结果吻合得较好,证明所提出的组合梁各阶段受弯承载力计算方法是正确的,具有一定的理论意义和参考价值.
The composite material of ECC / RC composite beam can be obtained by partially replacing the concrete in the tension zone of reinforced concrete beam with high ductility fiber cement-based material, which can effectively improve the ductility and crack resistance of the beam.Based on the assumption of flat section and the material constitutive model, And the calculation method of bearing capacity at each stage is obtained.According to the design rules of concrete structure, a simplified method for calculating the ultimate bearing capacity of ECC / RC composite beams is proposed, and the composite beam The bending moment-curvature relationship of the member and the simple method of calculating the ductility of the composite beam.At last, the test results of a composite beam are used to verify the theoretical formula.The results show that the calculated results are in good agreement with the experimental results, The calculation method of the flexural bearing capacity of the composite beams at each stage is correct and has certain theoretical significance and reference value.