Study On Mechanical Behavior Of Steel Screw Anchor

As a stressed member,anchor bolt has applied in various projects.It is mainly to bear the tension which is derived from water pressure,earth pressure or other loads,in order to maintain the stability of the building structure.Usually,the bolt is tightly locks together with the stratum and structure by connecting them,so as to ensure the force transferred.Therefore,in this paper,That a new type of anchoring technology called steel screw anchor is proposed by changing the anchoring method of the bolt on the basis of the original theory of anchoring mechanism.Compared with the traditional anchor bolt,it is not only can be twisted into soil without grouting to ensure construction quality;but also it can improve the efficiency of force transfer between bolt and stratum by the mechanical occlusion and friction between anchor plate and soil.So,steel screw anchor has the advantages of high lateral friction resistance,convenient construction and so on.And,for the use of steel screw anchor,it is not only can be used for foundation pit reinforcement,but also can be used in the anti floating engineering,it compared to the anti uplift pile is more economical.In this paper,steel screw anchor has been taken mechanical simulation analysis and geometric parameter influence analysis in the aspect of the stress of the bar under the condition of complex stress and the ultimate bearing capacity with ABAQUS.The main content includes:1.In this paper,two kinds of screw anchors are proposed,and determined The geometric and material parameters.2.Introduce the ABAQUS software and the calculating method,and use it to establish the three-dimensional model for two shape of steel screw anchor,analysis of the influence of steel screw anchor continuous drilling and late bearing on soil anchorage,with simulation results.3.Respectively analysis of the stress state of the soil and the change of the ultimate bearing capacity of the screw anchor under the combined action of torque and vertical load,in the case of different anchor plate diameter and anchor plate height of the steel screw anchor.4.Analysis of the force characteristics of the spiral anchor in the bearing stage,and summed up the two screw anchor failure mechanism and load transfer mechanism of screw anchor under the condition of different ratios(the distance between anchor plate and anchor plate).5.Describes the Mohr-Coulomb failure criteria,and the limit analysis of two failure mechanisms is compared with simulated values by using plastic mechanics.6.Through the theoretical calculation,verify the superiority of the use of steel screw anchor by comparing and analyzing the anchorage length of the anchor bolt and steel screw anchor in the same bearing capacity.