摘要
为研究聚乙烯醇纤维增强工程水泥复合材料(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,以剪切韧性指数和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纤维体积分数在0~2vol%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。
The shear toughness of polyvinyl alcohol fiber reinforced engineered cementitious composite(PVA/ECC)beams without stirrups was studied in this paper.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 were 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 vol%of volume fraction of PVA fiber,the larger volume of PVA fiber,the more energy is consumed 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.
作者
王玉清
刘潇
高元明
刘曙光
WANG Yuqing;LIU Xiao;GAO Yuanming;LIU Shuguang(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;School of Mining and Technology,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2019年第8期1968-1976,共9页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51368041)
内蒙古自治区高等学校科学研究项目(NJZY093)
关键词
聚乙烯醇纤维增强工程水泥复合材料
纤维掺量
剪切韧性
剪切韧性指数
斜裂缝综合指数
polyvinyl alcohol fiber reinforced engineered cementitious composite(PVA/ECC)
fiber content
shear toughness
shear toughness index
diagonal crack composite index
