摘要
为研究多尺度聚丙烯纤维混凝土的弯曲疲劳性能,开展基准混凝土、聚丙烯粗纤维混凝土及多尺度聚丙烯纤维混凝土的静载试验及不同应力水平(0.75、0.80、0.85)下的弯曲疲劳试验,建立弯曲疲劳寿命方程,并结合ABAQUS与FE-SAFE软件建立纤维混凝土梁的三点弯曲疲劳有限元模型。结果表明:聚丙烯纤维的掺入,尤其是多尺度聚丙烯纤维混掺显著增强了混凝土基体的抗折、抗疲劳性能。双对数lgS-lgN疲劳方程能够较好地描述多尺度聚丙烯纤维混凝土的应力水平与疲劳寿命的相关性,使用lgS-lgN疲劳方程计算得到200万次循环荷载作用下多尺度聚丙烯纤维混凝土的疲劳强度最高,为3.91 MPa。三组试件疲劳寿命的数值模型预测值均介于实测疲劳寿命的最大值与最小值之间,并接近于疲劳寿命平均值,该模型为多尺度聚丙烯纤维混凝土的疲劳寿命预测提供了理论依据。
To study the flexural fatigue properties of multi-scale polypropylene fiber reinforced concrete,static load tests and flexural fatigue tests under different stress levels(0.75,0.80,0.85)of reference concrete,coarse polypropylene fiber reinforced concrete and multi-scale polypropy-lene fiber reinforced concrete were carried out.The flexural fatigue life equation was established,and the three-point flexural fatigue numerical simulation model of fiber reinforced concrete beam was established by combining ABAQUS and FE-Safe software.The results show that the incorporation of polypropylene fiber,especially multi-scale polypropylene fiber,significantly improves the flexural and fatigue resistance of concrete matrix.The lg S-lg N fatigue equation can be used for statistics the fatigue life of multi-scale polypropylene fiber reinforced concrete.According to the equation,the fatigue strength of multi-scale polypropylene fiber reinforced concrete under 2 million cyclic loading is the highest,which is 3.91 MPa.The predicted fatigue life of the three groups specimens is between the maximum and minimum values of the experimental results,and closes to the average value of fatigue life.The model provides a basis for the fatigue life prediction of multi-scale polypropylene fiber reinforced concrete.
作者
梁宁慧
毛金旺
游秀菲
刘新荣
周侃
LIANG Ninghui;MAO Jinwang;YOU Xiufei;LIU Xinrong;ZHOU Kan(School of Civil Engineering,Chongqing University,Chongqing 400045,China;National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area,Chongqing 400045,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第4期95-102,共8页
Materials Reports
基金
国家自然科学基金(41772319,52074042)。
关键词
多尺度
聚丙烯纤维混凝土
弯曲疲劳
疲劳寿命预测
数值模拟
multi-scale
polypropylene fiber reinforced concrete
flexural fatigue
fatigue life prediction
numerical simulation
作者简介
通信作者:梁宁慧,副教授,硕士研究生导师。2014年获重庆大学土木工程专业博士学位。主要从事混凝土结构教学工作和聚丙烯纤维混凝土在地下结构工程中的应用。作为主研人员完成国家自然科学基金、重庆市科委自然科学基金计划面上项目等科研课题10余项,其中获教育部科技进步一等奖1项(排名第5)。发表学术论文60余篇。liangninghui0705@163.com。
