不同纤维掺量下PVA/ECC梁剪切韧性试验

《复合材料学报》优先在线发表论文。

摘  要：为研究聚乙烯醇纤维增强水泥基复合材料（PVA/ECC）无腹筋梁的剪切韧性，基于5组PVA/ECC梁受剪破坏试验结果，以剪切韧性指数与斜裂缝综合指数为指标，对不同纤维掺量下PVA/ECC梁的斜截面剪切韧性进行了研究与评价。结果表明：PVA纤维的掺入能改善梁的开裂性能，明显提高梁受荷全过程的变形能力及斜截面承载力，从而提高构件的剪切韧性；PVA纤维体积率在(0~2)%范围内时，其值越大，加载过程中消耗的能量越多，斜截面抗剪承载力越高，破坏之前的总变形越大，梁的剪切韧性越好。

关键词：聚乙烯醇纤维增强水泥基复合材料；纤维掺量；剪切韧性；剪切韧性指数；斜裂缝综合指数

Abstract: This paper studies the shear toughness of PVA/ECC (Engineered Cementitious Composite with Polyvinyl Alcohol fiber) beams without stirrups. Based on the testing results of shear failure from five groups of PVA/ECC beams, the shear toughness of the PVA/ECC beams with different fiber contents are analyzed and evaluated while using the shear toughness index and the diagonal crack composite index as indicators. The results show that the incorporation of PVA fibers can improve the cracking performance and the deformation capacity of the beam, enhance the bearing capacity of the oblique section, and thereby increase the shear toughness of the member. Additionally, within (0~2)% of volume of PVA fiber, as the larger volume of PVA fiber is found to consume more energy in the loading process, and the greater deflection is made before reaching to the ultimate load with the higher shear capacity of the oblique section, the better shear toughness of the beam is obtained.

Keywords: PVA/ECC; Fiber content; Shear toughness; Shear toughness index; Diagonal crack composite index

作者：王玉清等，内蒙古工业大学 土木工程学院，呼和浩特

通讯作者：王玉清，内蒙古工业大学 土木工程学院，呼和浩特

全文详见中国知网学术期刊优先数字出版。