摘要
为了获取装配式混凝土结构钢筋浆锚连接界面的破坏演化规律,借助数字散斑相关方法(DSCM),对装配式混凝土结构进行了纵向钢筋浆锚连接拉拔试验。通过观测钢筋浆锚连接的破坏过程,并对散斑图像进行分析,研究了装配式混凝土结构浆锚连接钢筋受力变形演化特征、锚固体系受力位移场演化特征、锚固体系受力应变场演化特征。研究结果表明:锚固剂的厚度会影响锚固体系的破坏模式及锚固极限承载力;在锚固体系中,拉拔力沿钢筋从加载端向自由端不断传递,且锚固剂厚度越大,传递距离越深;在拉拔过程中,锚固体系的变形主要集中在锚固剂与混凝土交界面,并随荷载的增加沿钢筋向体系内部扩展;在拉拔力作用下,加载初期试件的第一主应变与最大剪切应变主要存在于加载端钢筋周围的灌浆料区域,随着拉拔力增加,应变向混凝土基体与灌浆料黏结界面扩展,直至与黏结界面处应变相衔接。
In order to obtain the failure evolution law of the reinforced grout anchor connection interface of prefabricated concrete structures,a longitudinal steel bar anchor connection test was carried out on a prefabricated concrete structure by the digital speckle correlation method(DSCM).By observing the failure process of steel bar anchor connection and analyzing the speckle image,the evolution characteristics of the stress of the fabricated concrete structure anchor,the evolution characteristics of the force field of the anchor system,and the evolution characteristics of the strain field of the anchor system were studied.The results showed that:①The thickness of the anchoring agent would affect the failure mode and the ultimate bearing capacity of the anchoring system.②In the anchoring system,the pulling force was continuously transmitted along the steel bar from the loaded end to the free end,and the greater the thickness of the anchoring agenthas,the greater the transmission rangeis.③During the drawing process,the deformation of the anchoring system was mainly concentrated at the interface between the anchoring agent and the concrete,and expanded along the steel bar to the inside of the system as the load increases.④Under the pulling force,in the initial,the first principal strain and the maximum shear strain mainly existed in the grouting area around the reinforcement at the loading end.As the pulling force increased,the strain expanded to the bonding interface between the concrete matrix and the grouting material until it connects with the strain at the bonding interface.
作者
李悦
孟文君
高崇铭
吴琦琦
LI Yue;MENG Wenjun;GAO Chongming;WU Qiqi(College of Civil Engineering, North China University of Technology, Beijing 100144, China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2021年第2期25-30,共6页
Journal of Zhengzhou University（Engineering Science）
基金
北京市属高校基本科研业务费项目(110052971921/062)
北方工业大学毓优人才支持计划(XN012/044)。
关键词
浆锚连接
DSCM
拉拔试验
变形场
应变场
anchor connection
DSCM
drawing test
deformation field
strain field
