单桩竖向抗压承载力的分项系数研究

本文结合上海市标准 ,利用随机场理论和可靠度理论 ,研究了获得Ps、fi、Psb统计特性的统计原则 ,对相关距离、桩截面尺寸、端阻力计算范围等在程序编制中的协调问题进行了讨论和实用化处理。并对上海地区 1 9个预制桩场地和 1 7个灌注桩场地获得的参数的统计特性进行了分析计算 ,进而分别求出了由静力触探法确定预制桩和灌注桩单桩极限承载力的可靠度指标的统计特性。在此基础上 ,利用完全可靠性分析方法分别求出了上海地区由静力触探法确定预制桩和灌注桩承载力的分项系数

Research on Partial Factors for Determining Bearing Capacity of the Pile

Combined with Shanghai Foundation Design Code and based on the random theory and reliability theory, the authors explored the criteria for the calculation of the statistical properties of the parameters obtained in cone penetration test (CPT), the issues about computation of correlation distance, cross area of pile and the scope to calculate the pile end resistance are discussed and simplified for application. The statistical properties of the parameters obtained from CPT are analyzed in 19 fabricated pile construction sites and 17 bored pile construction sites in Shanghai. The statistical properties of the reliability indexes were computed by CPT method for prefabricated pile and bored pile, respectively. Based on these results and by using complete reliability theory, the partial factors of bearing capacity formula of prefabricated pile and bored pile by CPT method were obtained.