桩土作用下缺陷大管桩单桩极限承载力理论计算
发布时间：2019-08-07 18:42
【摘要】：码头大管桩出现的不同类型缺陷,如混凝土脱落和钢筋锈蚀,会造成码头承载能力下降。基于完整桩-土体系的荷载传递理论,推导获得缺陷桩剩余极限承载力的计算公式。依托工程实践,考察混凝土剥落和钢筋锈蚀这两种缺陷类型对单桩极限承载力的影响,并得出相应结论:混凝土剥落位置对单桩竖向极限承载力和单桩抗拔极限承载力有影响,混凝土剥落位置位于土层内部会减小单桩竖向极限承载力和单桩抗拔极限承载力,单桩竖向极限承载力减小0.07%,单桩抗拔极限承载力减小1.72%;但对桩身竖向承载力却不同,混凝土缺损对桩身轴心受压承载力减小25.65%,钢筋损失对桩身竖向承载力减小20.95%。混凝土缺损比钢筋缺损对桩身各项承载力的影响要大得多。
[Abstract]:Different types of defects of large pipe piles in wharf, such as concrete shedding and steel bar corrosion, will lead to the decrease of wharf bearing capacity. Based on the load transfer theory of complete pile-soil system, the formula for calculating the residual ultimate bearing capacity of defective pile is derived. Based on the engineering practice, the effects of concrete peeling and steel corrosion on the ultimate bearing capacity of single pile are investigated, and the corresponding conclusions are drawn: the position of concrete peeling has an influence on the vertical ultimate bearing capacity of single pile and the ultimate bearing capacity of single pile. The vertical ultimate bearing capacity of single pile and the ultimate bearing capacity of single pile will be reduced by 0.07%, and the vertical ultimate bearing capacity of single pile will be reduced by 0.07%. The ultimate bearing capacity of single pile is reduced by 1.72%. However, the vertical bearing capacity of pile body is different. The axial compression bearing capacity of concrete defect to pile body is reduced by 25.65%, and the vertical bearing capacity of pile body by steel bar loss is reduced by 20.95%. The influence of concrete defect on the bearing capacity of pile body is much greater than that of steel bar defect.
【作者单位】： 中交四航工程研究院有限公司;
【分类号】：U656.1
本文编号：2524114
[Abstract]:Different types of defects of large pipe piles in wharf, such as concrete shedding and steel bar corrosion, will lead to the decrease of wharf bearing capacity. Based on the load transfer theory of complete pile-soil system, the formula for calculating the residual ultimate bearing capacity of defective pile is derived. Based on the engineering practice, the effects of concrete peeling and steel corrosion on the ultimate bearing capacity of single pile are investigated, and the corresponding conclusions are drawn: the position of concrete peeling has an influence on the vertical ultimate bearing capacity of single pile and the ultimate bearing capacity of single pile. The vertical ultimate bearing capacity of single pile and the ultimate bearing capacity of single pile will be reduced by 0.07%, and the vertical ultimate bearing capacity of single pile will be reduced by 0.07%. The ultimate bearing capacity of single pile is reduced by 1.72%. However, the vertical bearing capacity of pile body is different. The axial compression bearing capacity of concrete defect to pile body is reduced by 25.65%, and the vertical bearing capacity of pile body by steel bar loss is reduced by 20.95%. The influence of concrete defect on the bearing capacity of pile body is much greater than that of steel bar defect.
【作者单位】： 中交四航工程研究院有限公司;
【分类号】：U656.1
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