Yazar "Kisa, M. Hasim" seçeneğine göre listele

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    Experimental study on hysteric behavior of composite shear walls with steel sheets
    (Elsevier, 2021) Kisa, M. Hasim; Yuksel, S. Bahadir; Caglar, Naci
    Owing to demanding structural requirements, composite shear walls have become necessary in reinforced concrete high-rise structures subjected to earthquake forces. Composite shear walls also limit the inter-story drift angles during severe earthquakes in terms of their load-carrying system performance. Within the scope of this study, two types of shear walls were constructed on a 1:3 scale. One type is a conventional reinforced concrete shear wall having boundary zones consisting of only conventional reinforcement. The other walls tested were composite shear walls having boundary zones consisting of cold-formed steel sheets (CFSSs). The dimensions of the CFSSs used in the shear wall boundary zones were 2xL19x57x7, 4xL23x69x5, and 2xL17x49x7 (mm). The composite shear walls were tested under cyclic lateral loadings, and their behaviors were investigated. Lateral force vs. top displacement curves with envelopes were evaluated from graphs based on the measurements, and crack propagations in the element were investigated step by step. Dissipated energy, ductility capacity, and rigidity properties based on the experimental results were compared.
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    In-plane behaviour of beam-to-column connections of corrugated web I-sections
    (Elsevier Sci Ltd, 2014) Aydin, R.; Yuksel, E.; Yardimci, N.; Kisa, M. Hasim; Gokce, T.
    This paper presents the results of an experimental study to examine the in-plane behaviour of the moment-resisting beam-to-column connections of thin-walled sinusoidally-corrugated web I-sections. A group of specimens of nearly full-sized beam-column assemblies made of sinusoidal corrugated web I-sections were tested under cyclic loading in the Structural and Earthquake Engineering Laboratory of Istanbul Technical University (ITU). Whereas two of the specimens have corrugated panel zones, the others have flat plate panel zones, according to an existing practice. The results of the experimental works are evaluated in terms of the general behaviour of the specimens and the regional behaviour of the panel zones. Three-dimensional nonlinear finite element analysis (FEA) models are developed in ABAQUS, including nonlinear interaction along with the contacting parts. The analytical results show a satisfactory convergence with the experimental results. The specimens that had relatively thicker flat plate webs in the panel zone were more stable than those which had corrugated web panels. (C) 2014 Elsevier Ltd. All rights reserved.
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    Numerical study on the response of composite shear walls with steel sheets under cyclic loading
    (Elsevier, 2021) Olabi, M. Nadir; Caglar, Naci; Kisa, M. Hasim; Yuksel, S. Bahadir
    As an alternative to conventional reinforced concrete walls, composite shear walls have been studied recently due to their great advantages in terms of structural performance under seismic loading. Researchers usually use ready-made profiles for composite shear walls, but in this study L-shaped cold-formed steel sheets were selected for numerical analysis under lateral cyclic forces. A macroscale numerical model was developed using a fiber beam-column element with a shear spring model to reproduce the actual behavior of composite shear walls. In addition, the OpenSees-based model was verified against three experimentally tested composite shear walls and showed robust simulation ability. Moreover, in order to fully explain their effect on the performance of composite shear walls, the properties of L-shaped steel sheets were studied parametrically with the help of the numerical model in terms of thickness and yield strength. It was clear that increases in the sheets' yield strength and thickness increased the lateral load-displacement capacity of the walls. It was thought that the two factors were connected in terms of their effects, and the L-shaped steel sheet arrangement in the boundary zone had essential participation in the total response of the composite shear wall under the applied loads.