采用ECC替代混凝土可以提高结构在偶然荷载作用下的抗连续倒塌性能，但在悬链线大变形阶段钢筋与ECC间可能会出现粘结滑移破坏。本文基于霍普金森压杆（SHPB）试验装置，进行了钢筋与ECC的动态粘结滑移性能试验，分析了ECC强度等级、应变率、钢筋直径对极限粘结强度、刚度和滑移量的影响规律，获得了高应变率下钢筋与ECC的平均粘结滑移曲线，得到其粘结滑移破坏模式。并与静态粘结滑移试验进行对比，得到了动态粘结强度增强因子DIF。进一步，通过钢筋开槽内贴应变片法，获得不同锚固位置的粘结应力及相对滑移的分布规律，提出粘结位置函数。最后，根据试验结果得到钢筋与ECC平均粘结滑移本构，进而乘以粘结位置函数得到考虑锚固位置影响的动态粘结滑移本构，为ECC结构构件设计及有限元分析提供试验依据和理论参考。
Abstract
The use of ECC instead of concrete can improve the progressive collapse resistance of structures under accidental loads but bond-slip may occur between reinforcement and ECC during the stage of large deformation of the catenary. In this paper, based on the Hopkinson Pressure Bar (SHPB) test device, dynamic bond-slip behavior of steel bar and ECC is tested. The influence of strength grade, strain rate and diameter of steel bar on ultimate bond strength, stiffness and slip are analyzed. Mean bond-slip curves of steel bar and ECC under high strain rate are obtained. The dynamic increase factor DIF is calculated by comparing dynamic bond-slip curves with static bond-slip curves. Further, the distribution of bond stress and relative slip at different anchorage positions are obtained by placing strain gauge in the slot of reinforcement, and the bond position function is proposed. Finally, according to the test results, the average bond slip constitutive force of rebar and ECC is obtained, and then the dynamic bond-slip constitutive force considering the influence of anchorage position is obtained by multiplying the bond position function, which provides experimental basis and theoretical reference for ECC structural member design and finite element analysis.
关键词
高应变率荷载 /
钢筋-ECC粘结滑移 /
霍普金森压杆（SHPB）试验 /
位置函数 /
粘结滑移本构关系
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Key words
high strain rate load /
rebar-ECC bond slip /
Hopkinson Press Bar (SHPB) test /
position function /
bond- slip constitutive relation
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参考文献
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