直锚段钢筋黏结作用对锚固板下混凝土局压承载力影响

Bond Stress From the Rebar in the Straight Anchor Section on the Local Bearing Capacity of Concrete Under Anchoring Plates

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摘要为了研究直锚段钢筋与混凝土之间的黏结作用对锚固板下混凝土局压承载力的影响,完成了30个端板钢筋混凝土拉拔试件的拉拔试验。试验用锚固板尺寸分别为50 mm×50 mm×20 mm、60 mm×60 mm×20 mm,混凝土保护层厚度c分别为84 mm和62.5 mm,混凝土强度等级介于C30~C50,拉拔钢筋直径d分别为25 mm和32 mm,试验中将其锚固长度l_(ad)分为5种类型。分析结果表明:锚固板下混凝土局压承载力F_(l)与混凝土轴心抗压强度f_(c)、拉拔钢筋相对锚固长度l_(ad)/d和相对保护层厚度c/d有关;F_(l)随l_(ad)/d的增大而近似线性增大(较初始值增加约69%),随f_(c)的增大而线性增大(较初始值增加约80%),随c/d的增加而减小,降幅最大可达34%。基于分析结果,拟合得到了以l_(ad)/d和c/d为自变量的锚固板下混凝土局压承载力F_(l)计算式。 In order to study the effect of the bond stress from the rebar in the straight anchor section on the local bearing capacity of concrete under anchoring plates,30 pull-out tests of end-plate reinforced concrete were completed.The dimensions of the anchoing plate used in the test were 50 mm×50 mm×20 mm and 60 mm×60 mm×20 mm,the thickness of concrete protective layer c were 84 mm and 62.5 mm,the strength grade of concrete were C30,C40,and C50.The diameters of the reinforcement d were 25 mm and 32 mm and its embedded length l_(ad) was divided into 5 types in the test.The analysis results showed that the local bearing capacity of concrete F_(l) was related to axial compressive strength of concrete f_(c),the relative embedded length l_(ad)/d and the thickness of the concrete relative protective layer c/d;F_(l) increased approximately linearly with the increase of l_(ad)/d(about 69%from the initial value),increased linearly with f_(c)(about 80%increase from initial value),decreased with an increase in c/d,the decreasing amplitude was up to 34%.Based on data fitting,the formula for calculating the local bearing capacity of concrete under anchoring plates with l_(ad)/d and c/d as independent variables was obtained.

作者杨剑苗天鸣赵闪王勃战美秋冯光泽 YANG Jian;MIAO Tianming;ZHAO Shan;WANG Bo;ZHAN Meiqiu;FENG Guangze(School of Civil Engineering,Jilin Jianzhu University,Changchun 130118,China;Dalian Technology Modern Engineering Testing Co.,Ltd.,Dalian 116023,China;China Transportation Second Aviation Bureau Jilin Construction Co.,Ltd.,Changchun 130000,China)

机构地区吉林建筑大学土木工程学院大连理工现代工程检测有限公司中交二航局吉林建设有限公司

出处《工业建筑》北大核心 2023年第12期120-126,共7页 Industrial Construction

基金吉林省教育厅科学研究项目(JJKH20230339KJ)。

关键词局压承载力黏结作用相对锚固长度相对保护层厚度 local bearing capacity bond stress relative embedded length thickness of the concrete relative protective layer

分类号 TU7 [建筑科学—建筑技术科学]