摘要
竖向荷载对桩基水平承载力的影响较为复杂,目前确定桩基水平承载力通常不考虑竖向荷载的影响。采用数值模拟的方法研究竖向荷载对PHC管桩水平承载力的影响,混凝土采用弥散开裂模型,桩周土采用Mohr-Coulomb模型,并考虑了纵筋预应力的作用。模拟结果显示竖向荷载显著增大了单桩的水平临界荷载Hcr和开裂弯矩Mcr,同时增大了桩身位移。认为竖向荷载较大时应考虑其对单桩水平承载力影响。结论对桩基水平承载力的设计有一定指导意义。
Vertical load has a complex impact on the horizontal bearing capacity of pile foundation. At present, the horizontal bearing capacity is ascertained irrespective of the influence of vertical load. Finite element method is employed to research the influence of vertical load on horizontal bearing capacity of PHC pile in this paper. Concrete of pile body is simulated with smeared cracking model, surrounding soil with Mohr - Coulomb model, and the prestress of longitudinal bar is considered as well. It is shown that vertical load can improve the horizontal critical load and cracking moment, but increase the displacement of pile body simultaneously. The result could conduct the design of horizontal bearing capacity of pile foundation.
出处
《福建建设科技》
2012年第5期5-7,27,共4页
Fujian Construction Science & Technology
基金
泉州市科技计划项目
关键词
PHC管桩
水平承载力
竖向荷载
数值模拟
弥散开裂模型
PHC pile
Horizontal bearing capacity
Vertical load
Numerical simulation
Smeared cracking model
