Numerical Analysis Of Prefabricated Concrete Shear Walls With Dampers For Seismic Performance

Prefabricated structures for its construction speed and less environment pollution get developing and application of the fabricated vertical shear wall joint connection is the key to ensure structural integrity and seismic performance.In order to improve the seismic performance and energy dissipation capacity puts forward a set of damper prefabricated shear wall,namely in the two pieces of vertical shear wall setting flat-fell seam damper,by yielding damper after plastic deformation to dissipation of energy.The research contents of this paper mainly include the following points:(1)describes the mechanics model of different kinds of damper and the energy dissipation mechanism and combined with the research object of this article chose the displacement model of X type mild steel dampers,and explore the fabricated under different types of dampers,the seismic performance of shear walls.(2)put the X type mild steel dampers in two pieces of prefabricated shear wall vertical flat-fell seam,to test and verify the seismic performance of structure after setting dampers and energy dissipation capacity,using Open Sees software for the same size of the set of damper prefabricated concrete shear wall and ordinary cast-in-situ concrete shear wall pseudo-static numerical analysis for both yield and ultimate load,the yield,the limit displacement,ductility coefficient,accumulated energy dissipation mechanics performance parameters,such as comparative analysis it is concluded that: compared with cast-in-place shear wall,set the damper of prefabricated shear wall more full hysteretic curve,the total energy consumption by about 10%,ultimate displacement increases by about 41.5%,its ductility,ductility coefficient increased by about 65%;But the maximum capacity and stiffness decreased,and the peak load decreased by about 27%.It is indicated that the assembly concrete shear wall with the damper is decreased with the corresponding load,but its ductility and energy consumption are obviously improved,and the seismic performance of the shear wall is improved.(3)based on the above analysis,the effect of seismic performance on the structure is investigated by changing the position,width,thickness and quantity of the damper.The position of the damper is changed,and the analysis shows that,as the position decreases,the yield,peak and ultimate load decrease gradually.The ductility factor reaches the maximum at the bottom and is the smallest in the upper part;When the damper is set at the top,the hysteresis loop area of the structure is the largest,the additional damping ratio is the largest,and the energy dissipation capacity is the strongest.Therefore,when the damper is placed at the top,the ductility coefficient is not the maximum,but the difference between the two is within 5%,and the carrying capacity and total energy consumption reach the maximum,which is most conducive to the energy dissipation of the structure.By analyzing the width of the damper,it is concluded that with the increase of width,the yield,peak and ultimate load gradually increase.When the width reaches the maximum,the ductility factor is reduced to the minimum value,which is about 5%.The additional damping ratio increases with the increase of width and increases the energy dissipation capacity.Therefore,it can increase the width of the damper to improve the energy dissipation capacity of the structure.Change the thickness of the damper,through the analysis it is concluded that: with the increasing of thickness,yield,peak and ultimate load increases gradually,when added to a certain thickness,the bearing capacity increase smaller or tending to a certain value;The ductility coefficient decreases with the increase of thickness and reaches the minimum at the maximum width.The additional damping ratio increases with the increase of thickness,and the structural energy dissipation capacity increases.Therefore,in order to improve the energy dissipation capacity of the structure,the thickness of the damper can be increased.By analyzing the number of dampers,it is concluded that the ductility coefficient decreases gradually with the increasing of number,the yield,peak and ultimate load increase gradually.The additional damping ratio increases by about 60% and the number of dampers has a great influence on the structural energy consumption.Therefore,increasing the number of dampers can effectively improve the energy dissipation capacity of the structure.