Abstract The use of steel-encased precast concrete (SC) piles has risen rapidly for the construction of earthquake-resilient foundation systems for buildings in Japan and Southeast Asia. SC piles are used near the pile-pile cap connection owing to their increased ductility, and resistance against large bending moments and axial forces, compared to the other precast concrete piles. However, there are no official guidelines available for the design of SC piles in severe earthquakes, except for a proposed draft by the AIJ committee for the determination of bending capacities. In this work, a database of 79 tests on SC piles, all tested under axial-flexural loads, was created. The bending capacities obtained from these tests were used to verify the provisions of the proposed draft and the provisions for composite member design in AIJ, Eurocode 4 and, AISC. Furthermore, a distributed plasticity formulation was adopted to develop a non-linear static model, that takes into account the concrete confinement and local buckling of steel casing, for prediction of moment and drift capacities. The accuracy of the model was verified against various experiments, and the capability to reproduce the moment-drift relations was confirmed.

中文翻译：

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轴弯荷载作用下钢包高强度预制混凝土桩的设计模型

摘要 在日本和东南亚，钢包预制混凝土（SC）桩在建筑抗震基础系统建设中的使用迅速增加。与其他预制混凝土桩相比，SC 桩在桩-桩帽连接附近使用，因为它们具有更高的延展性，以及对大弯矩和轴向力的抵抗力。然而，除了 AIJ 委员会提出的确定抗弯能力的草案外，没有关于严重地震中 SC 桩设计的官方指南。在这项工作中，创建了一个包含 79 个 SC 桩测试的数据库，所有测试都在轴向弯曲载荷下进行。从这些测试中获得的弯曲能力用于验证拟议草案的规定以及 AIJ、欧洲规范 4 和，国际标准化委员会。此外，采用分布式塑性公式来开发非线性静态模型，该模型考虑了钢套管的混凝土约束和局部屈曲，用于预测弯矩和漂移能力。通过各种实验验证了模型的准确性，并确认了再现力矩-漂移关系的能力。