| Summary: This thesis presents the experimental, numerical and theoretical studies of a high ductility and energy dissipation capacity passive energy dissipation device called the Saw Type Seismic Energy Dissipaters (TTSES) which is developed for earthquake protection of buildings. TTSESs basic feature is that it has a design that allows the use of much more metallic damper than the existing systems in the literature and allows pinned connection with structural frame in diagonal direction. TTSES is composed of two main part called inner core and outer tube. The inner core has a series of metallic damper plates on both sides of the middle profile. The metallic damper plates are specially designed to yield in bending force as a result of the relative movement of the outer tube to the inner core. The experimental part of the study is comprised of two phases: firstly, some preliminary studies were carried out on metallic damper plates and then TTSES specimens were tested under cyclic loading. Results compared with a conventional steel brace specimen often used in existing steel structure applications. Finite element analysis were conducted with Ansys software. In the theoretical studies, some of the simplified methods used in previous studies in the literature have been utilized to obtain load-displacement relationship of TTSES specimens. With the developed system, high ductility and energy dissipation were achieved, and also a damping ratio of approximately 45 % were reached. The test results of TTSES have clearly demonstrated that it can be used with a great degree of reliability in the earthquake resistant design or upgrading of buildings.
Key Words: Passive Energy Dissipation, Metallic Damper, Damping, Steel Brace, Steel Structures, Cyclic loading, Finite Elements |
