基于ANSYS有限元的设备支架方桩应力分析

考虑桩土作用的桩基础设计将是未来精细化设计的发展方向。文章通过建立桩-土非线性有限元模型,分析了设备支架单桩基础在竖向和水平荷载作用下桩身最大正应力的发展情况,结果表明:桩身应力随着荷载强度的增大而线性升高;由于桩身开裂导致有效截面减小,水平荷载下的应力模拟值要高出规范值30%~45%。在竖向荷载作用下,桩身应力很少成为控制设计的因素;在水平荷载作用下,仅需少量配筋即可满足桩身应力要求,桩基承载力由桩体水平位移控制。

The design of pile foundation considering the action of pile and soil will be the development trend of fine design in the future.In this paper,through the establishment of pile-soil nonlinear finite element model,the development of maximum normal stress of single pile foundation with equipment support under vertical and horizontal load is analyzed.The results show that the stress of pile increases linearly with the increase of load strength;due to the decrease of effective section caused by pile cracking,the stress simulation value under horizontal load is 30%higher than the code value.Under the vertical load,the stress of the pile rarely becomes the factor of controlling the design;under the horizontal load,only a small amount of reinforcement is needed to meet the stress requirements of the pile,and the bearing capacity of the pile foundation is controlled by the horizontal displacement of the pile.