A new approach on pre-bent steel strips as seismic energy-dissipation devices

In this study, a new type of seismic energy-dissipative devices in the form of braces based on pre-bent strips has been utilized. In this approach, moment-resistance frame systems have been used in 5story and 2 bay frames. The height of stories and all spans length are 3m.In order to compare the response of models, braced (with damper) and unbraced (without damper), have been modeled. Pre-bent steel strips have been used in braced frames. Bilinear strain-stress model of mild steel has been used in this simulation. The responses of structures with dampers and without dampers under dynamic loading have been compared. The results show that seismic responses such as base shear, story acceleration, and story velocity of 3, 5 story frames with dampers have been improved (reduced). A series of time history inelastic dynamic analyses have been conducted and the results show the feasibility and effectiveness of using the utilized devices as seismic dampers to reduce structural responses such as base shear, acceleration, velocity, and displacement of stories. This new kind of dissipative devices control seismic damage and reduce story responses under cyclic loading.

Keywords:

pre-bent strips , response of structure , damper , energy dissipation