吉林大学学报(工学版) ›› 2019, Vol. 49 ›› Issue (4): 1144-1152.doi: 10.13229/j.cnki.jdxbgxb20180020
• • 上一篇
梁宁慧1,2(),缪庆旭1,2,刘新荣1,2,代继飞3,钟祖良1,2
Ning⁃hui LIANG1,2(),Qing⁃xu MIAO1,2,Xin⁃rong LIU1,2,Ji⁃fei DAI3,Zu⁃liang ZHONG1,2
摘要:
对粗、细聚丙烯(Polypropylene, PP)纤维不同混掺情况下的混凝土切口梁试件进行三点弯曲试验,基于双K断裂理论探讨了不同尺寸PP纤维混掺方式对试件断裂韧度的影响及其破坏机理,并通过起裂、失稳、黏聚韧度3者之间的定量关系得到实测黏聚韧度、起裂韧度增量和桥接韧度。借鉴3种普通混凝土的双线性软化本构曲线计算得到理论黏聚韧度,并将其与实测黏聚韧度对比,确定适合于不同纤维掺入情况下PP纤维增强混凝土(Polypropylene fiber reinforced concrete, PFRC)的双线性软化本构曲线。研究结果表明,PFRC相对素混凝土有较高的起裂韧度、失稳韧度和断裂能;2或3种尺寸PP纤维混掺时,其桥接应力对桥接韧度的增强效果非常显著;3种尺寸PP纤维在裂缝扩展的不同阶段发挥桥接作用,体现了良好的混掺增强、增韧效应;徐世烺和Reinhardt改进的双线性软化本构曲线,取校正系数λ为6时,可较好地适用于PFRC。
中图分类号:
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