Mechanical Performance Of Column Base Joint Of Arc Plate And Dissipating Energy By Slip-Friction

Earthquake experience in recent decades shows that buildings designed and constructed on the basis of modern seismic design theory have huge cost of damage repair or demolition,even if there is no destructive collapse and destruction after the earthquake motion.Moreover,the loss or discontinuation of building function will terminate social and economic life,resulting in more indirect and incalculable economic losses.This makes more people not only satisfied with the goal of preventing life loss as seismic performance,but also pay more attention to the development of damage control structures.Connection dissipating energy by slip-friction is an economical and effective form of non-destructive energy dissipation connection,which can overcome the yielding energy of traditional column base joint.Base on this,a new type of column base joint of arc plate and dissipating energy by slip-friction is proposed in this paper,which aims to replace the yielding energy of the traditional column base joint by the sliding friction energy between the plates and between the plate and the bolt and thus achieve the design goal of lossless energy.In this paper,the numerical simulation analysis of the connection is carried out,and the main results are as follows:(1)The ABAQUS finite element modeling process of the connection in this study is introduced in detail.The established finite element model is loaded monotonously and cyclically.The bearing capacity curve,hysteresis curve and skeleton curve of the connections are obtained.The stress distribution of the joints in different stages is analyzed,and the mechanical performance and energy dissipation capacity of the connections are studied.(2)Based on the previous results,the construction of the connection is further parameterized,and the effects of section size,axial compression ratio,friction coefficient between plates,ratio of thickness between flange and web of lower column,thickness of arc plates and the number of bolts on the mechanical properties of the connection are discussed.All the results show that this kind of connection has good mechanical performance and energy dissipation capacity,and can achieve the design goal of lossless energy.