عنوان مقاله [English]
Protecting civil engineering structures from environmental loads, such as strong winds and severe earthquakes, can save lives and reduce structural damages. Using passive, semi-active, and active control schemes for this purpose has become more promising and feasible over the past two decades. Passive control devices, such as viscous elastic dampers, viscous fluid dampers, friction dampers, metallic dampers, tuned mass dampers and tuned liquid dampers can partially absorb structural vibration energy and reduce seismic responses of structures. Meanwhile, Tuned Mass Dampers (TMD) are used as passive devices for energy dissipation in structural systems. A TMD device consists of a mass, spring, and dashpot and typically is tuned to the natural
frequency of the primary structural system. By attaching a TMD to the main structure, a portion of the vibration energy of the main structure is to transferred to the TMD where it dissipates in the damper of the TMD. One of the disadvantages of TMD is the sensitivity of its parameters to dynamic characteristic of the structure. In large earthquakes, the dynamic characteristics of the structure change due to inelastic behaviors. However, TMD parameters are set on the basis of initial dynamic characteristics of the structure and do not change during the vibration of the structure. Hence, any change in the dynamic characteristics of structure may lead to interference with TMD optimum performance and, in some cases, to an increase in the structure response. In this paper, inelastic behavior of material and geometric non-linearity of the structure are considered, and the effects of uncertainty in mass, damping, module of elasticity and yielding strength of the material on the performance of the TMD are investigated by using the fragility curves. Results indicated that uncertainty in mass and damping of the structure has greater influence on the response of structures equipped with TMD compared to module of elasticity and yield strength.