为研究某自复位圆柱桥墩柱脚节点的力学性能，对圆形截面自复位桥墩柱脚节点力学机理进行理论分析。推导桥墩整体的力与位移滞回曲线关键点的计算公式，包括屈服点、破坏点等，建立圆形桥墩墩顶力与位移关系的理论分析模型。基于OpenSees平台引用纤维铰模型对自复位耗能桥墩柱脚截面进行建模，结合拟静力试验结果，验证纤维铰模型的可行性和建模的准确性。在此基础上，通过纤维铰模型建立设置一个自复位圆柱桥墩，将推导结果的力-位移滞回曲线关键点与模拟得到的圆柱桥墩的骨架曲线结果做对比，验证推导方法的准确性。结果表明：该推导方法可以较好地得出自复位圆柱桥墩的消压点、屈服点和破坏点等，可为今后的圆形截面自复位桥墩研究提供参考。

In order to study the mechanical properties of the column foot joint of a self-resetting cylindrical pier, the mechanical mechanism of self-resetting cylindrical pier column foot joint with circular section was analyzed theoretically. The calculation formula of key points of the whole force and displacement hysteresis curve of the pier was derived, including yield point, failure point, etc. The theoretical analysis model of the relationship between pier jacking force and displacement was established. Based on OpenSees platform, fiber hinge model was used to model the section of pillar foot of self-resetting energy-consuming pier. Combined with pseudostatic test results, the feasibility and accuracy of the fiber hinge model were verified. On this basis, a self-resetting cylindrical pier was set up by fiber hinge model, and the key point of the deduced force-displacement hysteresis curve was compared with the skeleton curve of the simulated cylindrical pier to verify the accuracy of the deduced method. The results show that the derivation method can obtain the pressure relief point, yield point and failure point of self-resetting cylindrical pier, which can provide reference for the research of self-resetting pier with circular section in the future.