Comparative Study On Reinforcement Methods Of Pre-damaged Different Assembly Shear Wall

At present,prefabricated shear walls are widely used,and buildings will often be affected by factors such as natural disasters and changes in usage in the future design life,which makes the structure unable to meet the seismic requirements.necessary.Seismic reinforcement of existing damaged or non-compliant buildings has become a trend.Various countries have made more systematic achievements in the research of reconstruction and reinforcement technology of shear wall structures,but whether traditional reinforcement methods are suitable for assembled shear walls To be studied.Based on Song Hao's experimental research,this paper conducts a comparative study on the reinforcement methods of damaged prefabricated shear walls,and the conclusions obtained can provide a reference for the reinforcement of prefabricated shear walls.First,ABAQUS is used for finite element simulation,and the accuracy of the numerical model is verified by comparing the experimental and simulated skeleton curves.Secondly,the prefabricated shear wall test pieces PW1 and PW2 specimens with an axial compression ratio of 0.18 and different splicing positions,and the prefabricated shear wall test specimen PW3 with an axial compression ratio of 0.22 splicing positions above the ground beam Establish a finite element model,and carry out low-cycle repeated loading to damage the test piece.The enlarged section method and the bonded steel reinforcement method are used to perform the finite element simulation of the test piece.The comparative analysis of the damaged test piece is strengthened by the two reinforcement methods.Bearing capacity,ductility,etc.,explore the applicability of reinforcement methods to damaged assembled shear wall specimens.Finally,the effects of the axial compression ratio,the position of the splicing joints and the degree of damage on the applicability of the prefabricated shear wall reinforcement method are thoroughly studied.The main conclusions are as follows:(1)Two types of reinforcement methods are used to strengthen the assembled shear walls with different axial compression ratios through finite element software.The study found that under the same damage conditions,the specimens with high axial compression ratio assembled shear walls are increased.Compared with the steel-bonded steel reinforcement method,the strength and ductility of the specimen after the cross-sectionmethod strengthened are better,and the seismic performance is better.(2)Change the damage degree of the damaged prefabricated shear wall.The study found that the change of the damage degree has a certain influence on the applicability of the prefabricated prefabricated shear wall damaged specimen reinforcement method.As the degree of damage increases,the increased cross-section method of the damaged specimen increases significantly more than that of the bonded steel reinforcement method.For the specimens with a greater degree of damage,the increased cross-section reinforcement method is better for seismic performance.The slightly damaged and moderately damaged specimens can be selected from the enlarged section method and the stick steel reinforcement method.(3)In the case of the same degree of damage to the assembled shear wall,after the damaged test piece is reinforced by the enlarged section method and the bonded steel reinforcement method,the joint seam changes the seismic performance of the damaged test piece after reinforcement There is almost no impact.The main reason for the analysis is that the reinforcement of the test piece restricts the position of the joint and the ideal setting of the surface when the joint layer of the finite element model is connected to other components.(4)According to the destruction characteristics of the assembled shear wall,damaged specimens often form large through joints at the joint position,and the corner damage on both sides of the wall is obvious.The traditional reinforcement method is used to damage the assembled shear wall When strengthening,the location of the joints should be reinforced first,the restraint of the reinforcement layer on the joints should be strengthened,and the two sides of the assembled shear wall wall should be reinforced at the same time.