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    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.
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    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.