《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“砂土中钻孔桩的承载系数与阻力系数设计”

作者：D. Basu; Rodrigo Salgado

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2012年12月，138卷第12期，1455–1469页

关键词：承载系数与阻力系数设计；钻孔桩；轴向荷载；基础设计；砂土；荷载系数；阻力系数；极限状态；可靠性分析

摘要：将阻力系数应用于基于土壤因子的钻孔桩的设计方法中。系统的量化了设计因子和设计方程相关的不确定性，并采用蒙特卡洛法进行模拟以得到桩和基础承载力的分布。结果发现：桩承载力和基础承载力分布都符合正态分布，且静荷载和动荷载的施加被认为分别符合正态分布和对数正态分布。随后为了得到土壤剖面和桩身尺寸发生变化时的极限状态和标称阻力，进行了可靠性分析。通过分析得到了最优的静荷载和动荷载系数。并与联邦公路管理署推荐的荷载系数配合使用来调整最优阻力系数。

Load and Resistance Factor Design of Drilled Shafts in Sand

Authors: D. Basu; Rodrigo Salgado

Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 138, Issue 12 (December 2012), 1455–1469

Key words: Load and resistance factor design, Drilled shaft, Axial load, Foundation design, Sand, Load factors, Resistance factors, Limit states, Reliability analysis

Abstract: Resistance factors are developed for drilled shafts for a design method based on soil variables. The uncertainties associated with the design variables and equations were systematically quantified, and Monte-Carlo simulations were performed to obtain the distributions of the shaft and base capacities. Both the base and shaft capacities were found to follow normal distributions, and the applied dead and live loads were assumed to follow normal and lognormal distributions, respectively. Reliability analysis was then performed to obtain the limit state and nominal resistances and loads for a variety of soil profiles and pile dimensions. The optimal dead- and live-load factors were subsequently obtained from the analysis. The optimal resistance factors were then adjusted for use with the load factors recommended by the Federal Highway Administration.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000714