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Resistance factor contour plot analyses of load and resistance factor design of axially-loaded driven piles in clays

机译：黏土中轴向荷载打入桩荷载及阻力系数设计的阻力系数等值线图分析

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摘要

This paper presents a framework for calculating the resistance factors of load and resistance factor design (LRFD) for axially-loaded driven piles in clays that can fully account for all necessary reliability-related parameters. The Imperial College Pile (ICP) design method was adopted to determine the resistance factors. The ICP design method was selected because it has been widely verified and has produced close matches to measured pile load capacities. A high-quality database, originally employed to develop the ICP design method, was used to assess the uncertainties of base and shaft capacities. The uncertainties of dead and live loads were determined from previously reported results. The challenge of this paper was to identify the effect of base-to-shaft capacity ratios on resistance factors, which has not been considered in previous methodologies. The resistance factors, compatible with the load factors given in the American Association of State Highway and Transportation Officials (AASHTO) LRFD design specifications and those provided in the American Petroleum Institute (API) LRFD recommended practice, were calculated and proposed for different levels of target reliability index. The effect of base-to-shaft capacity ratios on resistance factors was noticeable, while the effect of dead-to-live load ratios on resistance factors was relatively small.
机译：本文提出了一个用于计算黏土中轴向荷载打入桩的荷载阻力系数和阻力系数设计（LRFD）的框架，该框架可以充分考虑所有必要的可靠性相关参数。采用帝国大学桩（ICP）设计方法确定阻力系数。之所以选择ICP设计方法，是因为该方法已得到广泛验证，并与测得的桩承载能力紧密匹配。最初用于开发ICP设计方法的高质量数据库用于评估基础和轴的能力的不确定性。静载荷和活载荷的不确定性是根据先前报告的结果确定的。本文面临的挑战是确定基础轴容量比对阻力系数的影响，这在以前的方法中尚未考虑。计算并提出了针对不同目标水平的阻力系数，这些阻力系数与美国国家公路和运输官员协会（AASHTO）LRFD设计规范中给出的载荷系数以及美国石油协会（API）LRFD建议实践中提供的阻力系数相符。可靠性指标。基准轴容量比对阻力系数的影响是显着的，而静载载荷比对阻力系数的影响相对较小。

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