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    Investigation Of The Use Of Teflon (Ptfe), Lead, Brass And Carbon Fiber Plates As Friction Pads In Rotational Friction Dampers
    (Selçuk Üniversitesi, 2022) Suci, Ensar; Kara, Nail
    In terms of civil engineering buildings, earthquake mitigation is a rapidly developing new research area. In general, it is aimed to reduce the effects of earthquakes by consuming some of the earthquake energy acting on the buildings through various mechanisms, so that less earthquake energy will affect the building and smaller accelerations will occur in the building. One of these mechanisms, rotational friction dampers, are mechanisms that convert kinetic energy into thermal energy, work with a rotational deformation mechanism, and consist of steel plates and friction pads, which are clamped with high-strength bolts. In order to improve the damping behavior of these dampers operating according to the Coulomb friction law (Ff = µ × N), it is necessary to steadily increase the friction coefficient (µ) or the force acting perpendicular to the friction surfaces (N). The dampers should be stable in increasing displacements while operating, maintain their capacity under repetitive cyclic loads, dissipate sufficient energy and should not decrease in resistance. In this experimental study, different friction pad materials have been tried to improve the friction coefficient in rotational friction dampers. Energy dissipation behavior was observed by clamping the dampers formed with Teflon (PTFE), lead, brass and carbon fiber friction pads with bolts clamped at certain torques. By comparing the test results obtained, the suitability of the use of these materials as friction pads was determined. The best result in comparison in terms of energy consumption was achieved in dampers with lead friction pads, brass friction pads, carbon fiber friction pads, respectively. It was found that the Teflon (PTFE) material was not suitable for use as a friction pad.