Seismic Performance of Steel Frames Equipped with a Combined Yielding Damper and Rubber Isolator in an Irregular Plan in the Near-Fault Area

Abstract

Various types of energy dissipation devices such as frictional dampers, viscoelastic dampers, flow dampers, and viscous dampers have been investigated and tested by researchers, taking into account that the remediation goal specifies the desired extent of damage. In general, these devices are expected to be good candidates for projects that have a performance level of (I.O) or (L.S). One of these devices is viscous dampers, which are velocity-dependent devices. The use of viscous dampers to reduce the dynamic response of buildings to earthquake excitation has been widely accepted due to their increased damping, lack of activation threshold, and economic efficiency. By knowing the relationships governing single-degree-of-freedom and multi-degree-of-freedom vibrations and generalizing them to structures, the damping phenomenon can be introduced as a means of dissipating seismic energy entering a structure during earthquakes and cyclic loadings. In order to expect controlled damping from the system, this damping must be applied to the structure through new members called dampers. These new members, which are responsible for dissipating the energy entering the structure, behave independently of the initial displacement and the applied forces, and their behavior changes only with changes in velocity. There are two general approaches to earthquake-proofing structures: the first approach is based on strength and ductility design, whose philosophy is based on two principles: creating strength and stiffness in structures to control lateral displacement and prevent the destruction of structural and non-structural members under the influence of small and medium earthquakes, and creating ductility and high energy absorption capacity in structures to prevent structural collapse in severe earthquakes. The main problem with this approach is that if we want the structure to behave in the linear elastic phase, the structural sections are designed completely uneconomically and cannot be implemented. The second approach is to use methods to increase the structural period and the structural performance in the linear elastic phase. The most important method for increasing the period of a structure is to use seismic base isolation systems.