Nine PHC piles with partial normal-strength deformed bars were prepared in present study, and cyclic loading tests were implemented to evaluate these piles’ seismic performance. The influence of the axial compression ratio and the amount of normal-strength deformed bars on failure modes, crack patterns, strength, stiffness, and ductility were examined. The test findings indicate that the change of axial compression ratio has a noticeable influence on the failure mode of PHC piles. A larger axial compression ratio results in a higher cracking bending resistance, ultimate bending resistance, and initial stiffness, but the propagation heights of flexural cracks decrease as the axial compression ratio increases. Furthermore, increasing the amount of normal-strength deformed bars causes a slight decrease in ductility. Finally, a calculation formula was proposed to predict the flexural capacity of PHC piles with partial normal-strength deformed bars.

中文翻译：

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正偏局部变形钢筋PHC桩抗震性能研究

本研究准备了9根具有部分法向强度变形钢筋的PHC桩，并进行了循环荷载试验以评估这些桩的抗震性能。研究了轴向压缩比和法向强度变形钢筋的数量对破坏模式，裂纹模式，强度，刚度和延性的影响。试验结果表明，轴向压缩比的变化对PHC桩的破坏模式有显着影响。较大的轴向压缩比导致较高的抗开裂弯曲性，极限抗弯性和初始刚度，但是挠性裂纹的扩展高度随轴向压缩率的增加而降低。此外，增加正常强度的变形钢筋的数量会导致延展性略有下降。最后，