In this lecture, the issue is about collaboration among architects and civil engineers. Zafer Kınacı was the speaker of the lecture who is a civil engineer and also is founder of Kınacı Engineering Company in Ankara. He gave some information about the designing static project, structural system of the building and the materials, which is used in wide-span structure. In the end of the lecture Mr. Kınay gave some examples that the structural project is designed by him like Next Level, J.W. Marriott Hotel, Sheraton Hotel, Tim Towers.
Because of the typology of the structure designed by him, the important issue is the largest opening with the minimum columns. While designing a house, the width of a room is maximum 8-10 meters. Most materials are sufficient to overcome this. But if the gym or auditorium or conference room is designed, 30-40 meters opening is difficult to pass without any columns. As a solution of this problem, the prestressed concrete can be used in wide-span spaces which known in Turkish ‘artgerme beton’. When compared with concrete, it can be possible that wide-span spaces can be obtained using thinner sections. When compared the steel, the prestressed concrete can cheaper.
Technically, after reinforcement is placed, ropes are placed. Concrete is poured and after the concrete is resistance, ropes are stretched. In this stage, this stress reduces the moment of the beam. As the moment of the beam decreases, the deflection decreases and the moment of inertia decreases. So that when the dimensions of the column and the beam are reduced, larger openings can be obtained.
As an example, in Next Level, 7.5 m centilever was passed with a 40 cm prestressed concrete slap. In J.W. Marriott Hotel, 27 m span and 9m cantilever were passed with prestressed concrete.
senakocakaya 