Study On Seismic Performance Of A New Compound Damper Used In Coupling Beam

Providing replaceable energy-dissipated fuse in weak parts of structures is a way to recover the function of important high-rise buildings quickly after earthquake.Shear walls are the main system of high-rise buildings to resist exterior forces,and coupling beams as the first line of defense to against earthquake,whether its post-earthquake function can be quickly resumed quickly and reduce the economic losses effectively are an urgent problem to be solved.The researches show that the seismic performance of coupling beams can be improved by providing dampers.The viscoelastic energy-dissipated damper with tooth steel plate is an innovation compound damper.In this paper,the seismic performance of shear walls with this compound damper be studied.The main contents are as follows:(1)The classification of conventional shear walls,mechanical properties and a method for calculating stiffness of coupling beams are introduced;the principle of construction and energy-dissipated of this damper are presented,as well as suggesting Bilinear-RO model can describe the resilience characteristics of this compound damper;deducing the stiffness of replaceable coupling beams and operational parameters of shear walls,then stating the relationship of this parameters.(2)Based on ABAQUS software,the simplified model of the compound damper is proposed,and its validity is verified by comparison with the simulation model;using dynamic time-history analysis to discuss the seismic performance of shear wall structures with this new replaceable coupling beams in frequent earthquakes,moderate earthquakes and rare earthquakes,the results indicate the damage of structures with dampers are reduced obviously;the time that tensile damage appeared earlier than compressive damage;this damper presents the satisfactory energy dissipation capacity.(3)Based on stiffness of conventional coupling beam,the design parametersubstitutional stiffness ratio of replaceable coupling beam is proposed,analyzing the seismic damping effect of shear wall in different substitutional stiffness ratio,the results show that when the value of substitutional stiffness ratio is 0.4,dynamic responses of walls can be well controlled,seismic energy can be concentrated on the compound dampers,it is feasible to replace dampers after earthquake.(4)Used new compound damper in shear wall which produced bend deformation mainly,dynamic time-history under rare earthquake found that relative to conventional shear walls,the 20 layer and 30 layer shear wall structures with new compound dampers can control seismic responds validly;new replaceable coupling beam system provide more additional effective damping ratio,the stronger the seismic intensity is,the more additional effective damping ratio it can provide;the higher the structure is,the more additional effective damping ratio is also provided.