【作者】 刘雪莹； 谭晓慧； 胡木子； 修临天； 侯晓亮；

【Author】 LIU Xueying;TAN Xiaohui;HU Muzi;XIU Lintian;HOU Xiaoliang;Resources and Environmental Engineering,Hefei University of Technology;

【机构】 合肥工业大学资源与环境工程学院；

【摘要】 为研究基本变量概率分布类型对桩基可靠指标的影响,以芜湖市PHC试桩资料为基础,对桩基工程建立无量纲化的功能函数,利用验算点法对桩的承载力极限状态进行可靠度计算。分别在恒载加住宅荷载、办公楼荷载及风荷载这三种荷载组合情况下,分析了桩基承载力试计比λR的三种概率分布类型(正态分布、对数正态分布和极值I型分布)对桩基可靠指标的影响。计算结果表明:λR的概率分布类型对桩基可靠指标影响明显;在相同情况下,λR为极值I型分布、对数正态分布与正态分布对应的可靠指标依次减小。更多还原

【Abstract】 In order to study the influence of the probability distribution of basic variables on the reliability index of pile foundation,a dimensionless performance function is established based on loading test results of PHC piles. And reliability analysis is carried out by using the design point method for the ultimate limit state of piles. The influence of three types of probability distributions of bacis vaitables( normal distribution,lognormal distribution and extreme value type I distribution) of pile bearing capacity test ratio( λR) on reliability index is analyzed under the condition of three types of load combinations( constant load attached with residential load,office load and wind load). The result shows that the probability distribution of λRhas a significant effect on the reliability index of pile foundation;.and in the same situation,the reliable index decreases gradually when the λRis corresponding to extreme value type I distribution,logarithmic normal distribution and normal distribution.更多还原