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中文摘要：
随机分布短纤维增强的超高韧性水泥基复合材料（UHTCC）是近年来基于微观力学发展的一种高性能水泥基材料。通过纤维的桥联与应力传递作用，拉应力应变曲线体现了伪应变硬化特征，实现了多重微细裂纹的稳态开裂，具有非常显著的非线性变形、优良的韧性和高的裂缝抵制能力，使传统水泥基材料的脆性破坏模式转变为韧性破坏模式。为了控制裂缝的宽度，提高恶劣环境下钢筋混凝土结构的耐久性，获得高的UHTCC性能，成本比，使用UHTCC替代钢筋混凝土梁受拉区的部分混凝土，分析UHTCC增强RC适筋梁的受弯性能，推导计算整个受力过程不同阶段梁的承载能力、M-φ关系以及衡量梁延性指数的解析计算公式。最后通过与试验结果的比较，验证公式的合理性。
英文摘要：
Based on a micro-mechanics model, a new type of cementitious composite, random-distributed short-fiber reinforced high performance ultra-high toughness cementitious composite （UHTCC）, has been developed. Steady state cracking of multiple fine cracks is realized though crack-bridging over brittle matrix and stress transform to brittle matrix provided by the fibers, which leads to the resulting pseudo strain-hardening behavior under tension. Therefore, UHTCC has advantages of remarkable non-linear deformation capacity, high toughness and excellent crack resistance ability when compared to traditional concrete. Ductile instead of the brittle failure mode exhibited in traditional cementitious composites occurs in UHTCC. In order to control crack width for improvement of durability for RC beams exposed to aggressive environment, considering the cost of UHTCC, concrete at the tension zone of a reinforced concrete beam is strategically replaced with UHTCC, and the flexural behavior of the beam is investigated. Analytical formulae are derived, including the load-carrying capacity at the different stages, moment-curvature relationship during the entire loading process, and the ductility index of beam Comparison between the calculated and the experimental results reveals satisfactory agreement and thus verifies the feasibility of the formulae.
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