复合桩基承载力可靠度分析与工程应用

Reliability ananlysis in bearing capacity and engineering application of compositepile foundation

从按单桩极限承载力设计复合桩基方法出发,运用可靠度理论,结合既有工程实例,对使用该法确定的承载力极限状态方程进行了较为全面的可靠度分析。对分项系数的组合时安全系数与可靠指标的关系、设计公式中系数变化对可靠度指标的影响做了系统的分析、进而研究了天然地基承载力利用系数的合理取值范围。

Based on design method in ultimate bearing capacity of single pi le of composite pile foundation, combined with a real project,structural reliab ility theory is used to analyse reliability of formula of the ultimate bearing c apacity by using this method.,further reasearch is carried out on aspect such as sensitivity of basic variables,the relationship between index of reliability an d safety factor aim at combination of different coefficient,the contribution to reliability with the change of each coefficient,and so on..This article also ens ure the range of using coefficient of bearing capacity of nature foundation.