钢筋与纤维编织网联合增强细粒混凝土梁的弯曲试验与理论研究

EXPERIMENTAL AND THEORETICAL INVESTIGATION ON THE FLEXURAL BEHAVIOR OF FINE GRAINED CONCRETE BEAM REINFORCED WITH TEXTILE-COMBINED STEEL

由于纤维编织网增强混凝土在达到承载极限时,易发生脆断,不利于作为承载构件。该文尝试加入一定量的细直径钢筋以避免TRC的脆断破坏,纤维编织网作为受力的主体,而细直径钢筋作为次承载体。试验结果表明,加入延性好的细直径钢筋可以克服TRC构件仅采用纤维编织网增强时的脆断缺点。此外,纤维编织网的表面粘砂处理可以提高其和细直径钢筋协同受力的能力;细粒混凝土中加入聚丙烯纤维可提高构件的开裂荷载;而纤维编织网和细粒混凝土的界面植入U型钩有助于发挥纤维编织网的增强作用,从而提高了构件的承载力。最后,基于RC结构的抗弯设计理论,给出了TRC构件的解析计算方法,计算值与试验结果吻合得较好,证明了计算方法的可行性。

Textile-reinforced concrete（TRC） is prone to brittle failure under ultimate stress,which limits its application to bearing load.In this study,some thin steel bars were added into TRC to prevent the brittle fracture of TRC,which was verified experimentally.Additionally,sticking sand on the epoxy resin-impregnated textile can improve the cooperating of the textile and the steel bars in bearing the load;mixing polypropylene fiber into fine grained concrete is helpful to enhance the initial cracking load of the component;embedding U-shaped hook at the interface between the textile and the fine grained concrete benefits the member to increase its bearing capacity.Finally,based on the bending design theory of RC elements,the analytic calculation formulae for the TRC are presented.Comparison between the calculated and the experimental results shows satisfactory agreement and thus verifies that the calculation method is practicable.