| The post-yield stiffness of the structure is an important index that affects the residual deformation of the structure after the earthquake.The structure with good and stable post-yield stiffness can effectively reduce the residual deformation of the structure.However,there are few researches on the factors affecting the post-yield stiffness in the existing research,and they are limited to the influence of the post-yield stiffness of the main structure on the seismic performance of the structure.Setting energy dissipators is an effective measure to improve the seismic performance of structures.Metal energy dissipators are generally made of steel,which has strong strain hardening characteristics,and strain hardening has great influence on the stiffness of energy dissipators after yield.In addition,the structural form and yield sequence of the energy dissipator will change the stiffness after yield.In view of the above problems,this paper studies the key parameters that affect the post-yield stiffness ratio of four kinds of shock absorbing members: buckling restrained brace,shear type metal energy dissipator,anti-buckling steel plate wall and out-of-plane bending type metal energy dissipator,and substitutes hysteretic models with different post-yield stiffness ratios into the frame structure to test the effect of post-yield stiffness on the seismic performance of the structure.By collecting the research related to four kinds of metal shock absorbing components at home and abroad,dozens of types of energy dissipators with complete data and full hysteretic curves are selected.By sorting out the structural parameters of these energy dissipators,the key influencing factors of the stiffness ratio after yield of each type of energy dissipator are determined.Based on experiment. |
