Finite Element Analysis Of The Effect Of Core Drilling On Vertical Bearing Capacity Of Reinforced Concrete Axial Compression Column

With the economic development entering the stage of high-quality development,the state pays more attention to the protection and utilization of resources.Therefore,we need to improve the added value of buildings,so the protection and reinforcement of existing buildings will become an important part of it.As a scientific,direct and reliable partial semi-damage detection method,the core drilling method will be widely used.However,the core method also has its unavoidable disadvantage.For example,after the core method is used to test the existing concrete structure or component,the remaining holes will cause certain damage to the structure or component.However,in the actual inspection project,the construction personnel often do not pay attention to the remaining holes,usually only the grass-roots treatment,and can not effectively restore the mechanical performance of the original components.Therefore,in order to make the core drilling method more fully used,this paper has carried out a series of studies on the hole problem left after the core drillingmethod and how to fill it effectively.Based on the simulation of ABAQUS finite element software,this paper studies the influence of drilling core on the mechanical properties of reinforced concrete columns under axial compression,and the mechanical properties after filling with a high-grade concrete prefabricated core column.The main contents are as follows:(1)The finite element software ABAQUS is used to simulate and analyze the experimental research on the influence of drilling core on the performance of concrete columns under axial compression in the existing literature.The simulated values are analyzed to see if they are in agreement with the experimental values.The constitutive relationship model and finite element model of each material are determined,which lays a foundation for the following research.(2)The difference of the position of the core is different for the force performance of the member.Therefore,in order to determine the optimum drilling position,the drilling core position is used as a variable to carry out finite element simulation.The drilling core is selected at 1/4,1/2 and 3/4 locations of the column component respectively.The results show that the core taking at 3/4 location of the column member has the least influence on the mechanical performance of the reinforced concrete axial compression column.(3)From the analysis of failure state,ultimate bearing capacity,deformation,displacement-load curve,concrete stress-strain relationship,steel stress-strain relationship,etc.,it is concluded that the failure mode of axially loaded column after drilling core changes from axially loaded failure to biased failure,and the ultimate bearing capacity of the axial column is also reduced,indicating that if the core is not filled in time,it will affect the bearing performance of the member.(4)This paper simulates the filling of holes left behind by drilling cores with prefabricated cores column.The analysis results show that this repair method can play a very good role in restoring the mechanical properties of drilling cores.Moreover,this method is easy to obtain materials,easy to operate,does not need long-term maintenance and has strong repairability.I hope this method can be popularized and used as soon as possible,and this paper provides a theoretical reference for the use of this method.