摘要
高强灌浆料被普遍用于装配式混凝土结构节点连接,用以提高钢筋连接的锚固性能。文中采用控制变量法设计了87个中心拔出试件来探究抗压强度、钢筋强度等级、钢筋直径、横向配箍和黏结长度等因素对钢筋-灌浆料黏结性能的影响。结果表明:提高灌浆料的抗压强度(85.8~122.7 MPa)不能提高黏结强度,这区别于以往混凝土拔出试验的研究结论;对于钢筋屈服前拔出和屈服后拔出2种破坏模式试件,提高钢筋强度等级仅对后者的黏结强度有提升作用;增加钢筋直径将降低黏结强度;设置箍筋并改变箍筋密度对拔出破坏试件的黏结强度没有影响;随着黏结长度的增加,黏结强度先增加后减小。通过参数分析提出黏结强度和峰值滑移的计算公式,计算值与试验结果吻合良好。
High strength grout is widely used for joint connection of precast concrete structures to improve the an⁃chorage performance of steel bar connections.In this paper,87 central pull-out specimens were designed using the the control variable method to investigate the effects of compressive strength,reinforcement strength grade,steel bar diameter,transverse stirrups and bond length on the bond performance between high strength grout and steel bar.It is showed that the improving grout compressive strength(85.8~122.7 MPa)cannot enhance the bond strength,which is different from the conclusion of previous concrete pull-out tests.For the two failure modes of pullout before steel yielding and pull-out after yielding,increasing the reinforcement strength grade can only improve the latter specimens′bond strength.Increasing steel bar diameter decreases the bond strength.Adding stirrups and changing stirrups density have no effect on the bond strength of pull-out specimens.The bond strength increases first and then decreases with the increase of the bond length.The calculation formulas of bond strength and peak slip were put forward through parameter analysis,and the calculated values were in good agreement with the test results.
作者
黄远
韩冰
HUANG Yuan;HAN Bing(Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures,Hunan University,Changsha 410082,China;College of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2022年第2期52-61,共10页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51890901)
湖南省自然科学基金项目(2020JJ2003)。
关键词
高强灌浆料
钢筋连接
中心拔出
黏结强度
峰值滑移
high strength grout
steel bar connections
central pull-out
bond strength
peak slip
