Research On Anchoring Performance Of Shallow Anchors After Reinforcement

In recent years,due to the renovation of old houses,structural reinforcement,changes in building use or expansion of existing buildings,the convenience and efficiency of anchoring technology have become more and more important in engineering,and the scope of application is also More and more widely.In actual engineering,due to various reasons,the anchorage depth of the anchors cannot meet the requirements of engineering design,resulting in insufficient structural bearing capacity.This article mainly focuses on this kind of components,using the method of post-planting small-diameter steel bars for reinforcement.Experimental research often requires a lot of manpower and material resources,and there are many factors that affect the tensile strength and bearing capacity of anchors.If the influence of these factors on the bearing capacity of the anchor is obtained completely by tests,a large number of components need to be tested,so it is not feasible.In this case,we can use the finite element software for analysis.In this article,we mainly use the ABAQUS finite element simulation method to simulate the reinforcement effect of the post-planting steel bar on the shallow anchor.The main content of this paper:(1)Analyze the research results on the force characteristics of anchor rods at home and abroad,and establish a feasible finite element analysis model based on the existing shallow anchor test research and related theoretical results.(2)The basic working principle and influencing factors of shallow anchors are described,and the research method of strengthening the anchoring performance of shallow anchors is proposed.(3)A simulation model is established based on the ABAQUS software.First,the simulation results are compared with existing tests to confirm the feasibility of the model,and then the post-planting reinforcement simulation is carried out.Set up multiple sets of models in which the spacing and buried depth of the post-grown steel bars change gradually,and finally use the strength parameters of the concrete and steel bar materials as the model’s failure criteria to obtain the post-grown steel bars at different spacings,embedment depths,diameters,and numbers of shallow anchors.The influence of the bearing capacity is obtained,and the critical buried depth of the post-planted steel bar at different intervals is obtained,and the performance of the post-planted steel bar to improve the bearing capacity of the component is observed.Main research conclusions:(1)The method of post-planting steel bars can increase the tensile bearing capacity of shallow anchors by up to 51.7%,but it does not reach the yield load of the steel bars,and the damage is still concrete.(2)The finite element simulation results show that the post-planting steel bars can indeed improve the load-bearing capacity of the components.In the post-planting steel bars,the reinforcement effect increases with the increase of the planting bar depth,but the maximum planting bar depth has a critical value.This critical value is negatively correlated with the spacing of post-grown steel bars.(3)The critical anchoring formula of post-planted steel bars and the calculation formula of reinforced member bearing capacity are derived from the finite element simulation data.The bearing capacity calculation formula shows the influence of various factors on the bearing capacity of the component,that is,before reaching the critical anchorage value,the implantation depth of the post-grown steel bar has the greatest impact on the bearing capacity,while the diameter has the smallest impact on the bearing capacity.