Magnetorheological (MR) dampers represent one of the most promising semi-active control devices for applications aiming at the seismic risk mitigation of new or existing civil structures. Two 30 kN MR dampers were experimentally tested subjecting them to assigned conventional displacement laws at their ends. The paper describes the main results of the above experimental activity and aims at imp...

In this paper, the development of non-linear building isolation systems is overviewed. The study summarizes commonly used linear in two categories, which are base and inter-storey systems. Typical isolators including Lead-Rubber Bearings Friction Pendulum viscous damper Tuned Mass Damper reviewed. analysis design also reported. After that, introduced from aspects based on their dynamic characte...

A suspended ceiling system (SCS) is one of the most fragile and non-structural elements during earthquakes. However, effective seismic protection technologies for enhancing have not been developed other than steel bracing system. An innovative passive vibration control proposed in this paper, which equipped a damper-employed pulley amplification mechanism into indirect system, named pulley–damp...

Vibration-based condition identification of bolted connections can benefit the effective maintenance and operation steel structures. Existing studies show that modal parameters are not sensitive to such damage as loss preload. In contrast, structural responses in time domain contain all information regarding a system. Therefore, this study aims exploit time-domain data directly for connection. ...

In this article we present numerical studies of waves interacting with a cylindrical point absorber that is directly driving a seabed based linear generator. For waves useful for power conversion, the wave/point absorber interaction can be modelled, using potential theory assuming an inviscid irrotational incompressible fluid. The generator is modelled as a viscous damper. This paper pays speci...

This paper discusses the damping measurements on cables with real-time controlled MR dampers that were performed on a laboratory scale single strand cable and on cables of the Sutong Bridge, China. The control approach aims at producing amplitude and frequency independent cable damping which is confirmed by the tests. The experimentally obtained cable damping in comparison to the theoretical va...

In addition to elastomeric devices, viscous fluid dampers can reduce the vibration transmitted dynamic systems. Usually, these are rate-independent and used in conjunction with isolators insulate base of buildings (buildings, bridges, etc.) shocks caused by earthquakes increasing damping capability. According EN 15129 standard, velocity-dependent anti-seismic devices Fluid Viscous Dampers (FVDs...