化学螺栓抗拔承载力理论与试验研究  

Theoretical and experimental study on pull-out bearing capacity of chemical bolt

作　　者：亓晓明 雷旭 刘小燕 张峰[3] 沈炼 QI Xiaoming;LEI Xu;LIU Xiaoyan;ZHANG Feng;SHEN Lian(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Civil Engineering,Changsha University,Changsha,410022,China;Institute of Geotechnical and Underground Engineering,Shandong University,Ji’nan 250061,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114 [2]长沙学院土木工程学院,湖南长沙410022 [3]山东大学岩土与地下工程研究院,山东济南250061

出　　处：《长沙理工大学学报（自然科学版）》2024年第5期123-135,共13页Journal of Changsha University of Science & Technology:Natural Science

基　　金：长沙理工大学专业学位研究生“实践创新与业务能力提升计划”项目(SJCX202119)。

摘　　要：【目的】研究锚固于混凝土中的化学螺栓抗拔承载力及其对应理论计算方法。【方法】基于四线性黏结-滑移本构模型,考虑化学螺栓与混凝土界面的残余摩擦强度,对螺栓与混凝土间的黏结受力过程进行分析,推导了化学螺栓在受拉状态下的荷载-位移曲线的解析方程,同时设计并进行了化学螺栓的直接拉拔试验,用以检验理论方法的可靠性。【结果】随着化学螺栓锚固深度增加,锚固体破坏模式逐渐从复杂破坏(混合破坏)转变为螺栓被拉断的单一破坏。与当前常用的三线性黏结-滑移模型计算结果和试验值的标准误差相比,基于四线性黏结-滑移模型计算结果与试验值的标准误差更小,说明本文的理论公式可以更准确地反映在拉拔荷载作用下的螺栓荷载-位移的变化趋势。【结论】研究结论可为采用化学螺栓锚固的构件拉拔受力分析提供对应的理论参考。[Purposes]This paper aims to study the pull-out bearing capacity of chemical bolts anchored in concrete and their corresponding theoretical calculation methods.[Methods]Based on the quadrilinear bond-slip constitutive model,the residual friction strength at the interface between chemical bolts and concrete was considered,and the bond stress process between bolts and concrete was analyzed.The analytical equation for predicting the load-displacement curve of chemical bolts in the tensile state was derived.At the same time,a direct pull-out test of chemical bolts was designed and conducted to verify the reliability of the theoretical method.[Findings]With the increase in the anchorage depth of chemical bolts,the failure mode of anchorage bodies gradually changes from complex failure(mixed failure)to a single failure in which the bolt is pulled off.Compared with the standard errors(SEs)between the results calculated based on the trilinear model commonly used in anchor rod calculation and measured data,the SEs between the results calculated based on the quadrilinear bond-slip model and measured data are smaller,indicating that the theoretical formula derived in this paper can more accurately reflect the trend of bolt load-displacement under pull-out load.[Conclusions]The research conclusion can provide a corresponding theoretical reference for the pull-out stress analysis of components anchored by chemical bolts.

关 键 词：化学螺栓 界面黏结 承载力 拉拔试验 临界锚固深度 

分 类 号：TU746.3[建筑科学—建筑技术科学]