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工程水泥基复合材料(ECC)具有高韧性及应变硬化特性,弯曲试验中通过在受拉区配置碳纤维筋(CFRP)的ECC梁展现出良好的变形能力和抗弯能力。本文先通过单轴拉伸压缩实验建立ECC和CFRP材料本构模型,在平截面假设基础上,提出适用于非金属配筋ECC梁的正截面抗弯承载力分析理论,计算结果与四点弯曲试验结果对比分析表明:⑴非金属配筋ECC梁体现了两种材料的优点,在受弯破坏前有较强的变形能力;⑵根据正截面抗弯承载力理论的计算结果与试验结果吻合较好,最大误差小于4%。该研究成果可供非金属配筋高韧性材料结构的计算分析和实际应用提供依据和参考。
Engineered cement-based composites (ECC) have high toughness and strain-hardening properties. Flexural tests show good deformability and flexural resistance through ECC beams with carbon fiber reinforcement (CFRP) in the tension zone. In this paper, the constitutive model of ECC and CFRP materials is first established by uniaxial tension compression experiment. Based on the assumption of flat section, the theoretical analysis of flexural capacity of normal section for ECC beam with non-metallic reinforcement is proposed. The comparative analysis of the test results shows that: (1) The ECC beams with non-metallic reinforcement embody the advantages of the two materials and have strong deformability before flexural failure; (2) The calculated results based on the theory of flexural capacity of normal section agree well with the experimental ones Well, the maximum error is less than 4%. The research results can provide the basis and reference for the calculation and analysis of the non-metallic reinforced high toughness material structure and its practical application.