摘要
为了使挖孔桩设计由定值设计法过渡到概率极限状态设计法,适应基础规范改革的需要,对沈阳城区36根人工挖孔桩试桩的承载力特征值的无量纲随机变量进行统计分析,利用无量纲随机变量的极限状态方程和校准法对人工挖孔桩竖向承载力进行了可靠性研究。研究结果表明:挖孔桩承载力特征值的试计比服从对数正态分布,荷载效应比和荷载组合形式对可靠指标的影响较大,挖孔桩承载力特征值的目标可靠指标可按不同荷载组合取不同的值,抗力概型分布对可靠指标的影响较小,该结果对辽宁省地方地基基础规范挖孔桩设计的改革具有一定的参考价值和指导意义。
In order to move from a deterministic design method to a probabilistic limit state design method in the design of digging-hole pile,and fulfill the requirement of basic code reform,a statistical analysis on dimensionless random variable within the bearing capacity characteristic values of 36 manual digging-hole trial piles was conducted in Shenyang urban area.The reliability study of the vertical bearing capacity of manual digging-hole pile was completed using the limit state equation of dimensionless random variable.As a result,the ratio of test data to design data for the characteristic value of the bearing capacity of the digging-hole pile complies to lognormal distribution;the ratio of load to effect and the load combination have significant impact on reliability;different values can be used for the target reliability index for the characteristic value of digging-hole pile＇ bearing capacity depending on different load combination;the resistance probability distribution has limited influence to the reliability index.The study results have a useful reference value to the digging-hole pile design reform in local foundation basic code in Liaoning province.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2010年第6期1020-1023,共4页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金项目资助(51078065)
关键词
人工挖孔桩
竖向承载力
可靠指标
manual hole digging pile
vertical bearing capacity
reliability index
