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通过18个中心拉拔试件试验,研究在基体中加入不同纤维(聚丙烯长纤维(PPA)、聚丙烯短纤维(PPB)、钢纤维(SF)以及混杂纤维)对玻璃纤维增强聚合物(GFRP)筋与混凝土基体粘结性能的影响,旨在寻找改善GFRP筋与混凝土基体粘结性能的有效途径。参照德国纤维混凝土标准DBV和国际材料与结构研究试验联合会标准R ILEM弯曲韧性评价方法,采用等效抗弯强度和变形能来评价粘结韧性。试验结果表明:与素混凝土(NC)基体相比,GFRP筋与掺入混杂钢纤维与聚丙烯长纤维以及各自单掺基体的粘结强度可提高13%~35%,还可改善粘结韧性;同时,GFRP筋与基体的粘结强度随钢纤维掺量增大而提高。根据试验结果拟合得出粘结滑移曲线上升段的模型参数,计算结果与试验结果吻合良好。
Through 18 center pull-out test, the effects of adding different fibers (PPA, PPB, SF and hybrid fibers) to glass fiber reinforced polymer GFRP) tendons and the bonding properties of concrete substrates, aiming to find an effective way to improve the bonding properties between GFRP bars and concrete substrates. Reference to the German Fiber Concrete Standard DBV and the International Society for Testing and Materials Research R ELEM flexural toughness evaluation method, the equivalent bending strength and deformation energy to evaluate the bond toughness. The experimental results show that the bonding strength between GFRP bars and hybrid steel fibers and polypropylene filaments and their single-doped matrix can be increased by 13% -35% compared with plain concrete (NC) matrix, and the bond toughness ; At the same time, the bond strength of GFRP tendons and matrix increased with the increase of steel fiber content. According to the test results, the model parameters of the ascending slip of the bond slip curve are obtained. The calculated results are in good agreement with the experimental results.