钢纤维再生混凝土轴压强度与损伤分析  

Axial compressive strength and damage analysis of steel fiber recycled concrete

作　　者：吉云鹏 陈宇良[1] 覃贝录 JI Yunpeng;CHEN Yuliang;QIN Beilu(School of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006

出　　处：《广西科技大学学报》2022年第1期19-25,共7页Journal of Guangxi University of Science and Technology

基　　金：广西科技基地和人才专项项目(AD19110068);广西水工程材料与结构重点实验室资助课题(GXHRI-WEMS-2020-05);国家级(广西)大学生创新创业训练计划项目(202010594033)资助。

摘　　要：为研究钢纤维再生混凝土单轴受压状态下的强度、耗能及损伤演化机理,以再生骨料取代率(γ)及钢纤维体积掺量(V)为试验参数,对24个钢纤维再生混凝土试件进行单轴受压试验。通过分析钢纤维掺量及再生骨料取代率对再生混凝土强度的影响,揭示了钢纤维再生混凝土的损伤演化机理。结果表明:随着钢纤维掺量增大,破坏形态由竖向劈裂破坏转化为斜向劈裂破坏,应力-应变曲线下降段逐渐平缓,残余强度与耗能逐渐提高;随着取代率增大,混凝土强度先增大后减小;当取代率为50%时,SFRAC的强度与耗能均达到峰值,损伤发展速率最慢;钢纤维可有效延缓再生混凝土的损伤发展。24 cylinder specimens are tested by considering the replacement rate of recycled coarse aggregate and the steel fiber content to test the mechanical properties and damage development of steel fiber recycled aggregate concrete under uniaxial compression.The damage evolution mechanism was revealed by analyzing the effects of recycled aggregate replacement rate and the steel fiber content on the recycled concrete strength.The results show that with the increase of steel fiber content,the failure pattern changes from vertical split failure to oblique split failure;the descending section of the stress-strain curve gradually flattens;and the residual strength and energy consumption increase gradually.With the increase of replacement rate,the strength of concrete firstly increases and then decreases.When the replacement rate of recycled coarse aggregate is 50%,both the strength and energy consumption of SFRAC reach the peak value,and the damage development rate is the slowest.Steel fiber can restrain the damage development of recycled aggregate concrete.

关 键 词：钢纤维再生混凝土 强度 能量耗散 损伤变量 

分 类 号：TU528.58[建筑科学—建筑技术科学]