Based on the analysis of the flexural properties on the connection of reinforced pile and pile cap under horizontal load at the site production of core concrete pipe , the development morphology of crack and the failure forms under various loads ore onvestiguted .It concluded that the crack of pile is earlier than reinforcing ring root, and when the load reaches the maximum , the junction ’ s destruction did not occur because of the confinement of the strengthening ring , which improves the bending capacity of the junction .and we deduct the form of cracking moment and verify the test result , after the nodes connection was destroyed .At last , combi-ning the test parameters it is able to estimate the bending capacity formula and calculate the bearing capacity when the root is destroyed .%对现场制作的加强型试件填芯混凝土管桩进行水平往复加载试验，研究各级荷载下裂缝的发展形态和破坏形式，得出管桩开裂先于加强环根部，且荷载达到最大时由于加强环的约束作用连接处未发生破坏，改善了连接处的抗弯承载能力；同时推导出填芯管桩的开裂弯矩理论计算公式并对实测结果进行验证；试件发生节点连接破坏后，结合试验各项参数推算出加强型试件节点处抗弯承载力公式并根据绘制的荷载-位移曲线计算出根部破坏时的抗弯承载力值，对其进行理论计算验证。
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