Dynamic Characteristics And Parameter Analysis Of Seismic Performance Of Self-Centering Energy Dissipative Rocking Reinforced Concrete Frame Structure

In order to make the RC frame have resilience and improve the ability of rapid restoration after the earthquake,the Self-centering Energy Dissipative Rocking Column（SCEDRC）is designed by using rocking column and Self-centering Energy Dissipative Brace（SCEDB）in this paper,and it is applied to the RC frame to form the Self-centering Energy Dissipative Rocking RC frame（SCEDR-RCF）.When the earthquake occurs,the swing motion of the rocking column can reduce the seismic force of the structure,the concentrated energy dissipation and self-centering effect of SCEDB can reduce the damage and residual deformation,so as to realize the resilience of the structure.The specific research contents and conclusions of this paper are as follows:（1）The construction of the SCEDRC and the swing process of the SCEDR-RCF are introduced,the related mechanical model is analyzed,the coordinated deformationδ_s of SCEDB and the anti lateral stiffness expression of SCEDR-RCF is derived.And then according to this,the factors that affect the coordinate deformationδ_s of SCEDB and first stiffness K₁,second stiffness K₂,initial pretension P₀ and friction force F of SCEDB are all main factors affecting the structure performance.（2）The parameter analysis of hysteresis performance of the SCEDRC is based on the Open Sees finite element software.The results show that the SCEDRC can overcome the shortcoming of the low energy dissipation of the rocking column and the large residual deformation after unloading of the ordinary column.It has the best comprehensive performance when the SCEDB’s installation angleγ=30^°.Increasing K₁ in the basic design parameters of the SCEDB has no significant influence on the performance of SCEDRC,while increasing other design parameters K₂,P₀,F and its own component size can improve the performance.（3）Based on the modal analysis,it is preliminarily concluded that the comprehensive performance of the SCEDR-RCF structure is the best when SCEDB’s installation angleγ=30^°40^°.Limited to the modal analysis is elastic,it is only known that the increase of K₁ in the basic design parameters of SCEDB is beneficial to improve the performance of the structure.In the range of allowable values,increasing the component size of SCEDRC can improve the performance of the structure.The layout of SCEDRC depends on the selection of performance index,when the lateral stiffness is taken as the index,the middle column of the structure adopts SCEDRC is the best;when amplitude is taken as the index,one row middle column and one row side column of the structure adopts SCEDRC is the best and the two columns adjacent as closer as possible.（4）Through the parameter analysis of the seismic performance,it is concluded that the seismic performance of the SCEDR-RCF structure is better than that of the RC frame and rocking frame structure,which can achieve the goals of resilience and so on.The installation angleγof SCEDB is not suitable for 10^°and 60^°,and the structure has the best damping performance when theγ=30^°40^°.In the basic design parameters of SCEDB,the increase of K₂ has limited influence on the structure performance,increasing K₁ and F can enhance the each performance of the structure,increasing P₀ can only enhance the displacement damping performance.In the range of allowable values,increasing the component size of SCEDRC can improve the seismic performance of the structure,among which,increase the length L_s of SCEDB is the most effective.In order to get the best comprehensive seismic performance of the structure,the SCEDRC should be arranged as the middle column,and the layout of one row as the side column and one row as the middle column should be avoided.