摘要
共设计制作9组试件,对钢筋内贴应变片的试件进行拉拔试验,系统研究了橡胶体积取代率、钢筋直径、锚固长度对变形钢筋与橡胶混凝土黏结性能的影响。观察了试件破坏形态并通过计算得出试件极限黏结应力和滑移量,得到了不同因素下黏结应力、相对滑移分布规律以及不同锚固位置处的黏结应力-滑移曲线。建立了考虑橡胶体积取代率下变形钢筋与橡胶混凝土黏结应力-滑移本构关系模型;通过对相同滑移值下不同位置(距自由端距离)处黏结应力的量纲一化处理,得到了不同橡胶体积取代率下的变形钢筋与橡胶混凝土的黏结位置函数。结果表明:橡胶体积取代率增加,极限黏结应力减小,对应加载端滑移量先增加后减少;钢筋直径、锚固长度增大均会导致极限黏结应力减小,对应加载端滑移量减少;对比各位置处黏结应力-滑移曲线发现,橡胶体积取代率增加、钢筋直径及锚固长度增大均会加剧黏结应力的不均匀分布;相对滑移量会随着橡胶体积取代率增加而增加,随着钢筋直径、锚固长度的增大而减少。
A total of 9 groups of specimens were designed and made,and the pull-out test on the specimen with sticking strain gauge on the steel bar was carried out.The effects of rubber volume substitution rate,steel bar diameter and anchorage length on the bonding performance between deformed steel bar and rubber concrete were systematically studied.The failure modes of the specimens were observed and the ultimate bond stress and slip of the specimens were calculated.The distribution of bond stress,relative slip and bond stress-slip curves at different anchorage positions were obtained under different factors.A constitutive model of bond stress-slip relationship between deformed steel bar and rubber concrete considering rubber volume substitution ratio was established.By dimensionless treatment of bond stress at different locations(distance from free end)with the same slip value,the bond position function between deformed steel bar and rubber concrete with different rubber volume substitution ratios was obtained.The results show that the ultimate bonding stress decreases with the increase of rubber volume substitution ratio and the corresponding slip at loading end increases first and then decreases.Increasing the diameter of steel bar and the length of anchorage will reduce the ultimate bond stress and the corresponding slip at loading end.Comparing the bond stress-slip curves at different locations,it is found that the uneven distribution of bond stress will be aggravated by the increase of rubber volume substitution ratio,the increase of steel bar diameter and anchorage length.Relative slip increases with the increase of rubber volume substitution rate and decreases with the increase of steel bar diameter and anchorage length.
作者
颜岩
章德越
马从伟
王迎斌
白应华
YAN Yan;ZHANG Deyue;MA Congwei;WANG Yingbin;BAI Yinghua(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,Hubei,China;Xizang Transportation Survey and Design Institute Co.Ltd.,Lhasa 850000,Xizang,China)
出处
《建筑科学与工程学报》
北大核心
2024年第1期171-180,共10页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(52008158)。
关键词
变形钢筋
橡胶混凝土
黏结性能
黏结应力-滑移本构关系
位置函数
deformed steel bar
rubber concrete
bond performance
bond stress-slip constitutive relation
position function
