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中文摘要：
采用纤维编织网增强混凝土（TRC）这种新型材料对结构进行修补加固不仅可以改善结构的性能，而且可以几乎不增加结构的截面尺寸。为了评估TRC增强钢筋混凝土构件的抗裂能力，分别对14根不同情况的梁进行弯曲试验。结果表明，在钢筋混凝土梁配筋率一定的情况下，提高TRC层中的配网率可以有效地延缓梁上主裂缝的发展，减小裂缝的宽度和间距；纤维编织网的表面粘砂处理能更好发挥纤维编织网的约束能力，从而有效减小梁受拉区底面的最大裂缝宽度。精细混凝土中掺加聚丙烯纤维有助于提高梁的起裂荷载和减小梁正常使用阶段的裂缝宽度，有助于改善精细混凝土的韧性。新老混凝土界面植入U型抗剪销钉可以提高增强后梁的整体刚度，从而提高其抗裂性能；而涂抹界面剂的作用不明显。最后，基于钢筋混凝土结构的裂缝间距和宽度计算理论，定性地分析了纤维编织网对钢筋混凝土结构裂缝计算中控制参数的影响。
英文摘要：
When the existing structures are strengthened or retrofitted by using the new composite of textile reinforced concrete （TRC）, their structural performance can be enhanced but their section sizes are hardly increased. In order to estimate the crack resistance of reinforced concrete components strengthened with TRC, a set of bending test with 14 different beams was carried. The experimental results show that when the reinforcement ratio of the RC beam is constant, the expansion of the main cracks of the beam can be effectively delayed and the crack width and span can be significantly decreased with the increase in the percentage of the textile. Sticking sand on the epoxy resin-impregnated textile can make the restriction ability of the textile better exerted, and thus the maximum crack width at the bottom surface in the tension zone of the beam can be effectively reduced. Mixing polypropylene fiber into fine grained concrete is helpful to enhance the initial cracking load and decrease the crack width of the beam at the service ability limit stage, and also to improve the ductility of fine grained concrete. Embedding U-shaped pin into new and old concrete interface contributes to the improvement of the integral rigidity of the beam strengthened with TRC and enhancing its capacity to resist cracking. However, there is almost no effect of smearing interfacial agent. Finally, based on the calculation theory for the crack spacing and width of RC elements, the influences of the textile on the control parameters for the crack calculation of RC structures are qualitatively analyzed.
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