Pariya Aalipour - Master of Structural Engineering, Institute for Higher Education ACECR, Khuzestan, Iran
Navid Siahpolo - Assistant Professor, Institute for Higher Education ACECR, Khuzestan, Iran

Energy absorber dampers are used to reduce the dynamic response of the structure against wind loading, earthquake and so on. One of the main purposes of designing a structure with dampers is to determine the ideal condition in which both stiffness and damping are increased. Creating such a balance is very difficult due to the dependence of these two factors. The visco-plastic damper (VPD) is a combination of viscoelastic and Yielding Dampers that until now limited research has been done on this kind of dampers. In this article, first, the verification of three types of simplified visco-plastic damper with names M1, M2, and M3 under Sinusoidal harmonic displacements are introduced and all of its formulations are thoroughly discussed moreover for completing the verification and investigate the effectiveness of the device on the response of multistory structures, the simplified model of the VPD (M3) was attached at each floor to the model of a nine-story five-bay steel frame designed for the SAC building project located in Los Angeles. The model was analyzed under two scaled records of earthquakes and nonlinear time history analysis was conducted using SAP2000 (v19.1.1). The matching of verification results was more than 90%. It is important to note that the results show the improvement of the performance of structures equipped with VPDs during earthquakes

Damper, Visco-plastic, Passive control, Moment frame, Earthquakes