The steel bars significantly enhance the mechanical properties of rammed earth, as they together withstand external loads. In order to investigate the bond performance between steel bars and rammed earth, the pull-out tests were conducted on 60 specimens. This study investigated the distribution of bond stress along the anchorage length of steel bars by embedding strain gauges inside the bars. The effects of four types of anchorage length, three types of cover thickness, three types of steel bar diameter and three types of compressive strength of rammed earth on the bond-slip behavior were investigated. Through experimental research and theoretical analysis, the distribution law of the bond stress along the anchorage length was obtained. The transfer mechanism of the bond stress and the failure mode of the specimens were analyzed. An improved bond-slip constitutive model was proposed to reflect the influence of the position function of bond stress distribution. Furthermore, a theoretical formula for the bond strength was proposed based on the analytical approach of elastic solid mechanics and the failure modes of the specimens, and its accuracy was validated by experimental results.

中文翻译：

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钢筋与夯土粘结滑移行为研究

钢筋显着增强了夯土的机械性能，因为它们共同承受外部载荷。为了研究钢筋与夯土之间的粘结性能，对60个试件进行了拉拔试验。本研究通过在钢筋内部嵌入应变片来研究粘结应力沿钢筋锚固长度的分布。研究了四种锚固长度、三种保护层厚度、三种钢筋直径和三种夯土抗压强度对粘结滑移行为的影响。通过试验研究和理论分析，得到了粘结应力沿锚固长度的分布规律。分析了粘结应力的传递机制和试件的破坏模式。提出了一种改进的粘结滑移本构模型来反映粘结应力分布位置函数的影响。此外，基于弹性固体力学的分析方法和试件的破坏模式，提出了粘结强度的理论公式，并通过实验结果验证了其准确性。