Study On Hysteretic Behavior Of Hybrid Coupled PEC Shear Wall With Laminated Rubber Damper Bearing

The hybrid coupled PEC shear wall is a two-stage energy dissipation structural system with high lateral stiffness and excellent seismic performance.Using the energy dissipated by the bending deformation at the bottom of the PEC shear wall,a reasonable structural design method can achieve the three-stage fortification goal of "no damage during small earthquakes,no damage during moderate earthquakes,and no collapse during large earthquakes.".However,research has found that when the earthquake action is large,the bending deformation at the bottom of the wall limb section mainly focuses on the parts where the wall limb edge is subjected to large tensile and compressive forces,resulting in serious damage to the bottom of the wall limb,which is difficult to repair after the earthquake.In order to improve the seismic performance of the structure,it is proposed to install laminated rubber damper bearings at both ends of the bottom of the wall limb to form a hybrid coupled PEC shear wall with laminated rubber damper bearings.Through the assistance of dampers to dissipate energy,increase structural ductility and reduce load degradation;In addition,dampers with replaceable loss components can fully consume energy at the expense of loss components under high strength loads,reduce the damage level of the original wall structure under earthquake action,and maximize the integrity and safety of the main structure.The research content of this article mainly includes the following four parts:(1)Based on the pseudo static reciprocating loading experimental study of ordinary hybrid coupled PEC shear wall specimens,the structural mechanics and the failure state of the wall legs are analyzed,and the accuracy and feasibility of the finite element model are verified;(2)According to the working mechanism of ordinary hybrid coupled PEC shear walls,combined with the design principles of laminated rubber bearings and soft steel energy dissipation dampers,four laminated rubber damper bearings that can be used in hybrid coupled PEC shear walls are designed.The finite element analysis software ABAQUS is used to conduct numerical analysis of the installation,comprehensively judging the bearing capacity,mechanical properties,and other characteristics of the device;(3)Pseudostatic loading was performed on the finite element models of independent single piece PEC shear walls with laminated rubber damper bearings and ordinary hybrid coupled PEC shear walls,respectively,to preliminarily evaluate the impact of damper bearings on the hysteretic performance of independent single piece PEC shear walls,and to adjust the damper bearing parameters based on the calculation results;(4)A finite element model of hybrid coupled PEC shear walls with laminated rubber damper bearings with different parameters was subjected to pseudo static loading.The effects of laminated rubber damper bearings on the hysteretic behavior of hybrid coupled PEC shear walls were comprehensively studied through parameters such as stress distribution,hysteretic curve,skeleton curve,bearing capacity,and ductility.The research results show that the stress distribution of the laminated rubber damper bearing using curved mild steel plate is uniform,and the deformation amount is reasonable.The stress and strain of the bearing during the loading process can deform the curved steel plate,thereby assisting the bearing in energy consumption.After reasonable design,under seismic action,the yield order of the hybrid coupled PEC shear wall with laminated rubber damper bearings is that the coupling beam first undergoes ductile shear failure,and then the damper bearing located at the bottom of the wall limb yields,conforming to the failure mode of "strong wall weak beam.".The wall limb ductility coefficient increased by 8.2% on average.And the damper at the bottom of the wall limb is easy to replace,which can be repaired after an earthquake.However,due to the soft steel plate being a vulnerable component,the yield bearing capacity of the wall limb is 10.2% lower than that of the ordinary PEC wall limb without damper support,and the initial stiffness is reduced by 60.5%.