基于随机加权法的基桩承载力的可靠度分析

谈志成; 司马玉洲

基于随机加权法的基桩承载力的可靠度分析 English Version

谈志成¹,
司马玉洲²

1.南阳理工学院建筑设计院,河南南阳 473004 ； 2. 南阳理工学院土木工程系,河南南阳 473004

基金项目: 河南省基础与前沿技术研究计划项目(102300410148)

详细信息

作者简介:
谈志成 (1974 – ) ,男,河南信阳人,硕士,从事结构设计及桩基工程研究。

中图分类号: TU473
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出版历程
- 收稿日期: 2011-08-21
- 发布日期: 2011-12-06

Reliability analysis of bearing capacity for piles based on random weighting method

TAN Zhi-cheng¹,
SIMA Yu-zhou²

1. Architechtural Design Institute Nanyang Institute of Technology, Nanyang 473004, China; 2. Department of Civil Engineering, Nanyang Institute of Technology, Nanyang 473004, China

摘要

摘要: 在桩基工程中,由于经济和工期原因,试桩数据往往很少,试验数据的离散性较大,由此计算出的承载力可靠度指标的误差较大。基于随机加权法理论,将承载力的试计比（承载力的实测值和计算值的比）“提携”为工程中所需的大样本数据,并利用一次二阶矩法给出了可靠度的计算方法。最后通过算例分析表明：随着加权次数的增加,承载力的试计比变异系数就越小,说明 “ 提携 ” 后的数据越集中；另外,随着加权次数的增加,承载力的可靠度就越大,桩基础就越安全。因此,仅利用实测数据评价桩基安全是不合理的,会给工程带来安全隐患。
- 可靠度 /
- 随机加权法 /
- 试桩 /
- 承载力 /
- 试计比
Abstract: In pile foundation engineering, due to high cost and time limit for a project, the data of test piles are often scarce and the dispersion degree is very large, which makes the error of calculated results of reliability for piles very large. T he theory of the random weighting method is employed to improve the bias factor (the ration of measured value of calculated value) of bearing capacity for piles into big samples meeting the engineering requirements, and the formulation of reliability is presented by using the first-order second moment when the values of the bias factor are improved. The results from case study indicate that the variance of the bias factors become small when the times of weighing become large, which shows that the values are more concentrated. In addition, with the times of weighing increasing, the reliability index becomes large, which means that the pile foundation is much safer, therefore it is unreasonable to calculate the reliability only using the original values, thus the danger maybe exists in the projects.
- reliability /
- random weighting method /
- test pile /
- bearing capacity /
- bias factor

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参考文献(18)

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基于随机加权法的基桩承载力的可靠度分析 English Version

作者简介: 谈志成 (1974 – ) ,男,河南信阳人,硕士,从事结构设计及桩基工程研究。

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Reliability analysis of bearing capacity for piles based on random weighting method

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作者简介:
谈志成 (1974 – ) ,男,河南信阳人,硕士,从事结构设计及桩基工程研究。