Performance and Failure Pattern on Enlarged Bottom Anchor Bolt under Pullout Loading

摘要

The pullout test of an anchor bolt is very important for the anchorage technology. Adopting enlarged bottom anchor bolts to wind turbine foundations can not only take advantage of the mechanical property of rock mass, but also have good security and economical efficiency. The finite element analysis software ANSYS is used in this paper to numerically analyze a single enlarged bottom anchor bolt under pullout loading, to research the performance and failure pattern of the anchor bolt. The anchor bolt side friction is extracted to understand the stress distribution of the bolt. By the analysis of the bearing capacity of anchor's enlarged head and the change of plastic zone form, the ultimate strength and destruction form of the anchor blot are clearly understood. The results also show that the bearing capacity of the proposed enlarged bottom anchor bolt can obviously increased, resulting in a cone-shape failure pattern of soil.