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Öğe Construction costs of tunnel form buildings(Union of Croatian Civil Engineers and Technicians, 2013) Ilerisoy, Z.Y.; Tuna, M.E.A residential building with a lateral load resisting system, adopted as a reference example, is considered in the paper. The system is made of shear walls realized using the tunnel form technology. The building is modelled for a varying number of floors, and the model is also used to consider the applicability of the technology with regard to construction costs. The influence of the type of soil on construction costs is also considered. The results obtain show that mistakes made in determining the soil class may lead to inadequate decisions during selection of the most favourable number of floors, and in the design of structural elements and foundations of buildings.Öğe Dynamic analysis of historical Sehzade Mehmet Mosque for base isolation application(2011) Soyluk, A.; Tuna, M.E.Seismic isolation technology is one of the novel developments in the construction technology to increase the earthquake resistance of structural systems. In this study, it is intended to strenghten a historical masonary mosque system with base isolation technique. As a historical masonry system, Sehzade Mehmet Mosque which is considered as the apprenticeship of Mimar Sinan is considered and modeled with the finite element method. This masonry system is investigated for fixed base and seismically isolated bases with lead rubber bearing and high damping rubber bearing. Dynamic analyses of these systems are performed with the response spectrum method and the resulting structural periods and responses are compared with each other. Results obtained from the study show that seismic base isolation technique applied to the historical masonry system improves the dynamic behavior of the system. It is also concluded that the seismic base isolation technique is a proper method to strengthen historical systems without damaging the original historical texture.Öğe Effect of seismic base isolation usage on the architectural design of irregular buildings(2011) Soyluk, A.; Tuna, M.E.Seismic isolation technology is one of the novel developments in the construction technology to increase the earthquake resistance of structural systems. In this study, an irregular reinforced concrete building with an L plan shape which includes all the irregularities in the plane and vertical defined in the Turkish Earthquake Code 2007 is modeled for three different base conditions. These base conditions are the fixed base and seismically isolated bases with lead rubber bearing and high damping rubber bearing. Besides these models, a regular building is also considered in this study which excludes all the irregularities except the A3 irregularity defined in the Turkish Earthquake Code 2007. Structural periods and responses obtained from time history analysis are compared with each other for the considered models. Results obtained from the study show that seismic base isolation technique applied to the reinforced concrete system improves the dynamic behavior of these systems. Although the seismic base isolation technique provides freedom in design, this outcome should not direct the architects to design irregular structures.Öğe Effects of number of storeys and concrete strength on the building cost of the multi storied buildings produced by using tunnel form in turkey(2011) Harmankaya, Z.Y.; Tuna, M.E.The rapidly increasing urban population in Turkey introduces the urbanization issue in increasing scales. As a solution to this problem, structures with more storeys are being constructed. As the intention is not only to fulfill the building deficits by building structures, it must provide the most ideal functionality, style, aesthetics and economy. The task to coordinate such complicated processes shall be the architecture's duty who determines the fundamentals and the main principles of the design. In our contemporary time in Turkey the most common functionality of multi-storied structures is the housing, and most intensively used technology in the housing sector is the shear-wall systems. In the settlement areas such as Or-An, Konutkent, Yaşamkent; which can be considered solely as small cities; shear-wall systems are used as the structural system of the multi-storied buildings and for their production tunnel form method is used. In the example application a housing structure formed up by the shear-wall system and in which tunnel form system is used; is handled, and models with different numbers of storey are established, and costs are compared. During the city planning, as there can be city block parcel applications and applications based on region; cost calculations are considered to enlighten these two subjects. The effect of concrete class is examined on the costs per an apartment flat. As a result, it is believed that the analysis which is done will constitute a significant decision criterion.Öğe Investigation of the behaviour of steel frames with the partial and full infill walls under horizontal loads with elasto-plastic methods(2011) Kaymak, F.; Tuna, M.E.For about 40 years, studies conducted on strength and behavior of infill walls have not been resulted in standardized consensus methods. However, it is a well-known fact that infill walls have significant impact on the behavior of steel and reinforced concrete frames under horizontal loads. In this study, positive and negative effects of infill walls (considered as non-structural members despite the aforementioned fact) on steel frames subjected to lateral monotonic loads are investigated. Within the study, a two-story, two-span planar steel frame is designed and modeled for seven different infill wall combinations such as with/without infill wall, band windows etc. For infill walls, gas concrete is used due to its light weight and high modulus of elasticity. In planar frames, the infill walls under horizontal loads are modeled with equivalent compression bar model and analyzed for elasto-plastic analysis. Based on certain assumptions, ultimate loads, energy dissipation, ductility, lateral displacements, and ultimate base shear forces of symmetrical and asymmetrical vertical infill walls on the frames are investigated. Moreover, short column issues on band window model are examined as well as soft story effects. Modeling and analyses are carried out in SAP2000 static analysis program.Öğe Linear elastic calculation of steel frames with band windows and full infill walls under lateral monotonic loading(2012) Kaymak, F.; Tuna, M.E.In this study, infill walls, which are commonly used nowadays, were examined using linear elastic method to investigate the positive and negative effects on steel frame systems under lateral loads. The most common models in structural applications were reviewed, and structural steel and gas concrete were selected for the load resisting frame system and the infill material respectively. The purpose of this study is to show that infill walls have advantages and disadvantages not only under the collapse load, but also under service loading. An equivalent diagonal compression bar model was used for the elastic analysis of infill walls in two-story, two-bay planar frames under lateral loads; and a total number of seven models were analyzed for the combinations of steel frames with, without, and partial infill walls. The strength calculations of the equivalent diagonal compression bar were based on the mechanical and geometric properties of the gas concrete. Effects of symmetrically and asymmetrically placed infill walls on the lateral displacement, rigidity, and natural vibration period of the frame were investigated as well as short column and soft story behaviors. The structures were modeled and analyzed using the SAP2000 structural analysis program.
