Effect Of Wing Wall And Joint Width On Seismic Performance Of New Type Of Energy-dissipated Precast Shear Wall

The new type of energy-dissipating vertical shear wall structure adopts the "wet design",which is equivalent to the cast-in-place shear wall,to make the bearing capacity of the structure in the vertical direction better transfer and resist the horizontal shear force.The vertical joints are connected with metal or friction dampers to form a "semi-dry structure".When the structure is subjected to lateral forces,the horizontal joint is equivalent to the cast-in-place shear wall,and the vertical joint weakens the overall stiffness of the shear wall.By consuming part of the seismic force through the damper,the risk of the shear wall collapsing under strong earthquakes is reduced.It is very convenient to place the damper in the vertical vertical joint of the assembled structure,and it is also very convenient to replace it,which is conducive to the promotion and application of the structure.A new type of energy-dissipating vertical joint shear wall with different flange and different slit width is taken as the research object.The main research contents are as follows:1)Three prefabricated shear walls with vertical joints of different sections and one one-shaped cast-in-place comparison specimen were designed.Metal dampers of the same size were installed in the vertical joints of prefabricated shear walls to conduct lowcycle reciprocating loading tests to study their mechanical properties.(1)Through the comparison of the test results between the energy dissipation shear wall and the overall cast-in-place shear wall,it can be obtained that the vertical joint divides the shear wall into parts with small stiffness,the initial stiffness is slightly smaller,and the deformation capacity and ductility are improved.When a large displacement is applied,the ultimate load of the energy dissipation shear wall is increased compared with that of the cast-in-place shear wall.(2)The existence of the wing wall can improve the initial stiffness of the prefabricated shear wall,and the flange wall limb can improve the energy dissipation capacity and deformation capacity of the shear wall as a whole.Among the three flange forms,Lshaped shear wall has the best ductility and energy dissipation,T-shaped shear wall is in the middle,and i-shaped shear wall is slightly worse.2)ABAQUS finite element simulation software was used to establish prefabricated shear walls with different slit widths(vertical slit widths were 200 mm,250mm and 300 mm,respectively)to study the effects of different slit widths on the seismic performance of prefabricated shear walls and dampers.The initial stiffness and hysteretic curve area of the energy-dissipating shear wall increase with the width of the joint,while the vertical vertical joint width increases,so does the bearing capacity of the shear wall.The results show that the width of the vertical joint determines the length of the bending element of the damper.The longer the bending element is,the more obvious the energy dissipation of the damper will be under the action of the large earthquake,and the better the overall energy dissipation of the shear wall will be.Figure 48;Table 14;Reference 54...