Research On Seismic Behavior Of New Energy-Consumption Prefabricated L-shaped Shear Wall Joints

The new energy-consumption prefabricated L-shaped shear wall structure is a shear wall-mild steel damper combined structural system with energy consumption mechanism,that is,a vertical joint is formed in the wall and an energy dissipating device is arranged.Due to the high rigidity and poor ductility of the cast-in-situ wall,it is not conducive to earthquake resistance.Therefore,the design concept of the new energy-consuming shear wall is proposed.The new structure has a strong initial stiffness,and when subjected to a large load,the damper deforms a part of the energy to prevent the structure from being greatly deformed,thereby achieving the purpose of absorbing energy.According to the existing experimental data,the corresponding shear wall solid element model is constructed by using ABAQUS software,which verifies the effectiveness of the simulation method.Through this method,a mild steel damper model is established.Under the same loading conditions,when the aspect ratio,width-thickness ratio,slit type,and plate thickness of the damper bending unit are the same,the smaller the width,the smaller the yield displacement.The greater the initial stiffness and yield,the more energy is consumed.When the width is the same,the yield displacement of the open transverse damper is slightly lower than that of the vertical joint device,but the yield load,ultimate load,initial stiffness,and total energy consumption are higher than the vertical damper.Based on the damper with better energy dissipation effect,three sets of L-shaped shear wall models are established,which are ordinary wall SW-1,with two and three damper walls SW-2 and SW-3.The hysteretic curve,skeleton curve and stiffness degradation curve of the model are obtained by pseudo-static low-cycle reciprocating loading.The results show that the ductility coefficients of SW-2 and SW-3 are increased by 37.17% and 41.88%,respectively,compared with ordinary walls.At the ultimate load,the energy consumption of SW-2 and SW-3 is 24.00% and 40.00% higher than that of the ordinary wall,and 6.89% and 31.03% when the load is broken.The stiffness and ultimate load of the energy-consuming wall are lower than those of ordinary walls,but this can be improved by increasing the number of dampers.The walls SW-2 and SW-3 increased the total energy consumption of SW-1 by 14.59% and 23.87%,respectively.The internal dampers in the wall respectively consume 45.16% and 58.14% of the total energy consumption of the SW-2 and SW-3 structures,which makes the energy input into the wall of the energy-consuming wall far lower than that of the ordinary wall under the same loading system.At the same time,appropriately increasing the number of metal dampers can also enhance the energy dissipation effect and improve the energy consumption of the wall.Figure70;Table17;Reference62...