چكيده به لاتين
Space trusses have a significant rigidity with the least amount of materials, hence have become popular in recent years. Since the force created in the structure due to the earthquake is proportional to its mass, the use of the space truss is economic. Studies have shown that these structures have better performance than other structures against earthquake and this performance is enhanced by the control system.
Passive control due to its simplicity and reliability is more acceptable, but it is not able to adapt to structural and environmental changes. Therefore, active, semi-active and hybrid control systems have been introduced that include controllers and sensors and according to the external stimulation and structural responses determine the control force. Active control systems require high energy and can cause instability in the structure, but semi-active control systems use a small power source to only resize the damping force, and there is no possibility of instability, so they are more focused than other control systems. Among the semi-active control systems, the MR dampers, due to their mechanical simplicity, high dynamic range, low energy requirements, large forces production capacity, and steady control, are considered as a convenient option for controlling structures against earthquake and wind turbulence.
Despite the benefits of using control systems, the design and installation of these systems is cost effective therefore, it is important to select the appropriate method that determines the optimal number and position of the dampers.
In this thesis, the optimal number and position of the MR damper are investigated in a pyramid-shaped space truss structure.
