Stick-up stability of large-diameter steel pipe pile considering combined wave-current loads
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摘要: 随着海洋工程建设水深的不断增加,导管架平台的钢管桩基础呈现出大直径、深贯入的特点。桩基承载力的提高导致了打桩施工难度的增长,不仅要求具有更大锤击能量的打桩设备,而且对打桩全过程的安全控制提出了更高的要求。桩的自由站立稳定性是打桩分析的第一个重要环节。针对置锤荷载的瞬态性特征,以钢管桩自由站立稳定性的静力分析方法为基础,提出了采用动力算法考虑作用于钢管桩上的波浪力和海流力,建立了钢管桩自由站立稳定性分析的动力模拟方法。研究表明,由于API规范法考虑的是荷载长期作用效果,与钢管桩置锤瞬间的瞬态过程不符,用该方法验算桩的自由站立稳定性偏于保守;动力法分析与API规范的计算结果对比表明,规范中的强度折减系数用于验算桩基自由站立稳定性时可以放大1.5倍。Abstract: With the increase of water depth in marine construction projects, characteristics of large diameter and deep penetration appear in the steel pipe piles used for jacket platform. Because the bearing capacity of piles is improved, constructions of piles become more difficult. It results in the need of hammers with larger blow energy and higher demand for safety in pile driving. The stick-up stability of piles is the first important part in the analysis of pile driving. Considering the transient characteristics of hammer load, a dynamic method is adopted to calculate the wave and current loads, and a dynamic simulation method is proposed to analyze the stick-up stability of pipe piles. The results show that the calculation of stick-up using the API code, which is different from the transient process and considers the long-term effect of load, is conservative. The API code can be used to check the stick-up stability of piles, and the strength reduction factor can be magnified 1.5 times.
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