Research On The Seismic Performance Of Damaged Prefabricated Shear Walls Reinforced With Reinforced Mesh Cement Mortar

In recent years,the application of prefabricated buildings has received more and more attention.Its advantages of industrial production,simple installation,energy saving and fast construction speed are in line with the strategic thinking of national sustainable development.Therefore,it quickly gained the attention of the industry and the support of national policies.Prefabricated shear wall structure is widely used in high-rise buildings,but there are still many problems to be further studied.The damage reinforcement of assembled shear wall under earthquake has not been fully studied.At present,most of the reinforcement methods for damaged assembled shear walls are still cast-in-place shear walls,and there is a lack of research on targeted methods.Whether the existing methods can be fully applied to assembled shear walls remains to be discussed.Therefore,this paper uses steel mesh cement mortar to reinforce the damaged assembled shear wall,and carries out low-cycle reciprocating load test to comprehensively evaluate the reinforcement effect of steel mesh cement mortar on the damaged assembled shear wall.Then,through the finite element software,the finite element model of steel mesh cement mortar reinforced damaged assembled shear wall is established.By comparing the simulation results with the experimental results,the accuracy of the finite element model modeling method and analysis method is evaluated.Finally,the parameters such as axial compression ratio,height-width ratio,concrete material strength,thickness of reinforcement layer and reinforcement method are selected as variables.The influence of these parameters on the seismic performance of reinforced concrete shear wall is studied by numerical simulation.The specific research contents are as follows :(1)The steel mesh cement mortar was used to reinforce the damaged assembled shear wall,and then the low-cycle reciprocating load test was carried out.The indexes before and after reinforcement were compared to comprehensively evaluate the effectiveness of the steel mesh cement mortar to reinforce the damaged assembled shear wall.The results show that the steel mesh cement mortar can not only effectively improve the bearing capacity of the damaged assembled shear wall,but also improve its deformation capacity,and there is no obvious premature failure.(2)The finite element model of steel mesh cement mortar reinforced damaged assembled shear wall was established by ABAQUS finite element software.Comparing the finite element simulation results with the experimental results,it is found that they are in good agreement.It verifies the correctness and feasibility of the finite model modeling and analysis method.(3)The parameters such as axial compression ratio,aspect ratio,concrete strength,thickness of reinforcement layer and reinforcement method are selected as variables.Then the finite element model under different parameters is established by ABAQUS finite element software.It studies the influence of these parameters on the seismic performance of damaged assembled shear walls reinforced with steel mesh cement mortar.The results show that with the increase of axial compression ratio,the bearing capacity of the damaged assembled shear wall reinforced by steel mesh cement mortar increases,but its ductility decreases;when the aspect ratio increases,the bearing capacity of the damaged assembled shear wall reinforced by steel mesh cement decreases,but its ductility increases;when the thickness of the reinforced cement mortar layer increases,the bearing capacity and ductility of the specimen increase;through the comparative analysis of double-sided reinforcement and single-sided reinforcement,it can be found that the reinforcement effect of double-sided reinforcement is better than that of single-sided reinforcement.