...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Computers and Geotechnics >Calibration of resistance factor for design of pile foundations considering feasibility robustness
【24h】

Calibration of resistance factor for design of pile foundations considering feasibility robustness

机译：考虑可行性稳健性的桩基设计阻力系数标定

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The resistance factor for pile foundations in load and resistance factor design (LRFD) is traditionally calibrated considering target reliability index (beta(T)) and statistics of load and resistance bias factors. However, the resistance bias factor is hard to quantify statistically. Consequently, the design obtained using the calibrated resistance factor can still miss beta(T) if the variation in resistance bias factor has been underestimated. In this paper, we propose a new resistance factor calibration approach to address this dilemma by considering "feasibility robustness" of design in the calibration process. Herein, the feasibility robustness is defined as a probability that the beta(T) requirement can still be satisfied even in the presence of uncertainty or variation in the computed bearing capacity. For illustration, LRFD approach for pile foundations commonly used in Shanghai, China is examined. Emphasis is placed on re-calibration of resistance factors at various feasibility robustness levels, with due consideration of the variation in the resistance bias factor. A case study is presented to illustrate the use of the re-calibrated resistance factors. The results show that the feasibility robustness is gained at the expense of cost efficiency; in other words, the two objectives are conflicting. To aid in the design decision-making, an optimal feasibility robustness level and corresponding resistance factors are suggested in the absence of a designer's preference. (C) 2016 Elsevier Ltd. All rights reserved.
机译：传统上，在考虑目标可靠性指标（beta（T））以及荷载和阻力偏差系数的统计数据后，对载荷和阻力系数设计（LRFD）中桩基的阻力系数进行校准。但是，电阻偏置因数很难进行统计量化。因此，如果电阻偏倚系数的变化被低估，则使用校准电阻系数获得的设计仍可能会丢失beta（T）。在本文中，我们提出了一种新的电阻系数校准方法，通过在校准过程中考虑设计的“可行性鲁棒性”来解决这一难题。在此，将可行性鲁棒性定义为即使在计算出的承载能力存在不确定性或变化的情况下仍然可以满足beta（T）要求的概率。为了说明起见，研究了在中国上海常用的桩基的LRFD方法。重点放在在各种可行性鲁棒性水平下重新校准电阻系数，并适当考虑电阻偏置系数的变化。提出了一个案例研究，以说明重新校准的电阻系数的使用。结果表明，以成本效率为代价获得了可行性鲁棒性。换句话说，这两个目标是矛盾的。为了帮助设计决策，建议在没有设计人员偏爱的情况下建议最佳的可行性鲁棒性水平和相应的阻力因子。 （C）2016 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号