护岸桩是保护江河湖海岸等免受波浪流冲刷的关键基础设施，其抗弯承载力对结构安全至关重要。针对研发的新型多边形预应力钢筋混凝土护岸桩，提出了非规则截面的抗弯承载力计算方法，通过Python编程实现了全自动计算，开展了系列的足尺试件四点弯曲试验，考虑了不同截面、配筋、长度和混凝土等级的影响，融合数字图像相关与摄影测量方法对变形、应变、裂缝等进行了非接触测量，研究了其抗弯性能与破坏机理。研究结果表明：该桩抗弯承载力与延性更优，计算与试验误差为-0.18~0.27，验证了计算方法的准确性；其抗弯过程呈弹性、带裂工作、塑性3阶段特征；增大预应力筋直径可同步提高抗裂、屈服弯矩并增强延性，截面宽度增大可显著提高抗裂与屈服弯矩、但减小变形能力，提高混凝土强度可延缓开裂并提升抗弯承载力水平，桩长带来的跨径效应可使承载力差异收敛而挠度显著放大。研究成果将为新型护岸桩的设计与分析提供重要的理论与试验依据。

Revetment piles serve as critical infrastructure for protecting riverbanks and coastal regions from wave and current erosion. Their bending capacity is fundamental to ensuring structural safety and long-term durability. After addressing a newly developed polygonal prestressed concrete revetment pile, this study proposes an analytical calculation method for the flexural capacity of irregular cross-sections, implemented through an automated Python-based computational framework. A series of full-scale four-point bending tests were conducted to evaluate the influence of varying cross-sectional geometries, reinforcement configurations, pile lengths, and concrete grades. By integrating Digital Image Correlation (DIC) and photogrammetry, non-contact measurements of deformation, strain fields, and crack propagation were obtained to elucidate the flexural behavior and failure mechanisms. The results demonstrate that the proposed piles exhibit superior flexural capacity and ductility. The error between the calculated and experimental values ranges from -0.18 to 0.27, validating the precision of the proposed analytical model. The flexural process transitions through three distinct stages: the elastic stage, the cracked-working stage, and the plastic stage. Increasing the diameter of prestressed tendons simultaneously improves the cracking moment, yield moment, and ductility. While an increase in section width significantly enhances the cracking and yield moments, it leads to a reduction in deformation capacity. Furthermore, higher concrete strength delays crack initiation and elevates the overall flexural capacity, whereas the span effect associated with increased pile length results in a convergence of capacity differences but a significant amplification of deflection. These findings provide a robust theoretical and experimental foundation for the design and analysis of novel revetment piles.