竖向荷载作用下预应力抗拔灌注桩三维有限元分析  

Three dimensional finite element analysis of prestressed antiuplift pile under vertical load

作　　者：温欣[1,2] 徐东强[1] 闫文赏 张跃影[1] 

机构地区：[1]河北工业大学土木工程学院,天津300130 [2]唐山工业职业技术学院建筑化工系,河北唐山063200 [3]华北理工大学建筑工程学院,河北唐山063000

出　　处：《世界地震工程》2016年第2期152-158,共7页World Earthquake Engineering

基　　金：河北省高校科技研究基金项目(交通荷载作用曹妃甸地区饱和软土动力性能研究)(QN2014335)

摘　　要：预应力抗拔灌注桩通过对桩体施加预应力产生的抗拔力可以有效阻止裂缝发展,在承载力不变的前提下降低桩基钢筋用量,节省工程成本。借助有限元数值分析方法,通过各种符合抗拔桩工作性状的参数的合理假定,对竖向荷载作用下预应力抗拔灌注桩的工作性状及桩-土动力相互作用进行了研究。结论表明:桩径增大和桩长增长将导致桩顶位移量减小;预应力抗拔灌注桩与普通桩相比具有更好的变形协调能力和承受上拔荷载的能力。Based on anti-uplift force caused by prestress applied to pile body, prestressed anti-uplift filling pile may resist cracking development effectively and decrease reinforcement use amount and engineering cost under un- changed bearing capactiy. With the aid of finite element numerical analysis tools, through reasonable assumption of parameters about working character that accords with uplift pile, we studied the working traits of single pile with vertical load and dynamic interaction between pile and soil. Results show that the increase of diameter and length of the pile can lead to decrease of pile top displacement, and compared with the ordinary pile, the prestressed anti-uplift filling piles has better deformation coordinate ability and the ability to bear the uplift load.

关 键 词：预应力 抗拔灌注桩 有限元 桩侧阻力 

分 类 号：TU473.1[建筑科学—结构工程]