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Experimental Research on Corrosion Characteristics of Steel Trestles in Marine Environment and Its Stability Bearing Capacity Analysis
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摘要: 依托平潭海峡公铁两用大桥钢栈桥,对深水裸岩区钢管桩的腐蚀现状进行深入研究。首先对腐蚀钢材进行现场取样,测定其表面腐蚀形态,并基于蚀坑深度分布规律将腐蚀钢管简化为阶梯柱模型进行力学分析,最后基于超景深试验结果建立精细化有限元模型来分析腐蚀钢管的轴压稳定承载力。研究结果表明:海洋环境中腐蚀后的钢管桩呈现非均匀腐蚀状态,浪溅区最大腐蚀深度可为全浸区的5倍;钢管桩可简化为变截面阶梯柱力学模型,提出了变截面柱相对高度计算公式;阶梯柱可作为简化模型用于腐蚀钢管桩的稳定承载力分析,对腐蚀钢栈桥未来的工作性能研究提供参考。Abstract: Based on the steel trestle of Pingtan Straits Rail-cum-Road Bridge, the corrosion status of the steel pipe piles in the deep water-bare rock area was investigated. Firstly, the steel plates under corrosion were sampled on site, and the surface morphology of the steel plates was measured, and then the steel pipe piles were simplified into the stepped columns for analysis according to the depth distribution of steel pit corrosion. Finally, the refined finite element model considering the pit corrosion was established based on the field test results, and the stability bearing capacity of the corroded steel pipe piles was analyzed. The results showed that a non-uniform corrosion distribution along the column height could be observed on the corroded steel pipe piles in the marine environment, and the maximum corrosion depth in the splash zone could be 5 times of that in the full immersion zone. The steel pipe piles could be simplified as the stepped columns with variable cross-section, and the formula for calculating the effective length of stepped columns was proposed. The finite element model of stepped columns could be used as the simplified model to analyze the stability bearing capacity of corroded steel pipe piles, which could provide a reference for the future research on the working performance of corroded steel trestles.
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