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从改善纤维编织网增强混凝土(TRC)加固层中纤维束和精细混凝土的界面粘结及新老混凝土的界面特性入手,研究TRC增强钢筋混凝土(RC)梁的弯曲性能。试验结果表明:纤维编织网的表面黏砂处理能更好地发挥其有效约束能力,从而充分发挥TRC增强层的限裂和增强作用;新老混凝土的界面植入U型抗剪销钉可以提高增强后RC梁的整体受力性能,而涂抹界面剂对其几乎没有影响。此外,精细混凝土中掺加聚丙烯纤维有助于提高构件的起裂荷载;在RC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结构主裂缝的发展,减小裂缝的宽度和间距,明显地提高梁的屈服荷载和极限承载力。最后,基于RC结构的抗弯设计理论,模拟TRC增强RC梁的荷载与跨中位移曲线,计算值与试验结果吻合得较好,证明了计算方法的可行性。
The flexural behavior of RC beams strengthened with TRC was studied in order to improve the interfacial bonding between fiber bundles and fine concrete in the fiber reinforced concrete (TRC) reinforced concrete and the interfacial properties between new and old concrete. The test results show that the surface sticking sand of fiber braided mesh can exert its effective restraining ability, thus giving full play to the cracking and strengthening effect of TRC reinforced layer. The U-shaped shear pins can be enhanced by the interface between new and old concrete After the RC beam overall stress performance, and apply the interface agent has almost no effect on it. In addition, the addition of polypropylene fiber to the fine concrete helps to improve the initiation and cracking load of the member. When the RC beam reinforcement ratio is constant, increasing the distribution rate in the TRC layer can effectively delay the development of the main crack structure Small cracks in the width and spacing, significantly improve the beam yield load and ultimate bearing capacity. Finally, based on the RC bending resistance design theory, the TRC reinforced RC beam load and mid-span displacement curve are simulated. The calculated values are in good agreement with the experimental results, which proves the feasibility of the calculation method.