人工挖孔桩单桩竖向承载力可靠性分析  

Reliability analysis of vertical bearing capacity of single manual hole digging pile

作　　者：王利群[1] 赵文[1] 王勇[2] 李艺[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004 [2]中煤国际工程集团沈阳设计研究院,辽宁沈阳110015

出　　处：《四川建筑科学研究》2010年第6期93-96,共4页Sichuan Building Science

基　　金：国家自然科学基金资助项目(50508008)

摘　　要：基于沈阳城区挖孔桩竖向承载力试计比的统计参数和无量纲随机变量的极限状态方程,对挖孔桩竖向承载力进行了可靠性分析;采用校准法计算了沈阳地区地基规范中挖孔桩的目标可靠指标,并分析了荷载效应比、荷载组合和抗力概型分布对可靠指标的影响。研究结果表明,挖孔桩竖向承载力标准值遵循对数正态分布,荷载效应比和荷载组合形式对可靠指标的影响较大,抗力概型分布对可靠指标有一定程度的影响,挖孔桩竖向承载力在不同的荷载组合下应采用不同的目标可靠指标。On the basis of the static test data of manual hole digging piles in Shenyang,a reliability analysis of the vertical bearing capacity of single pile is made by utilizing the limit state equation of dimensionless random variables.The target index of reliability in the local specification of foundations is calculated by the method of calibration.Further more,the influence of loading effect ratio,different load compositions and distribution types of resistance on the reliability index is also investigated.It is shown that the resistance of manual hole digging piles follows the lognormal distribution,the influence of loading effect ratio and different load compositions on the reliability index is remarkable,the influence of distribution types of resistance on the reliability index is to a certain extent,whereas the target index of reliability of resistance is different with different load compositions.

关 键 词：人工挖孔桩 竖向承载力 可靠指标 

分 类 号：TU473.1[建筑科学—结构工程]