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- 저자 : Kazaz (검색결과 6 건)
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TWO-SIDED Γ-α-DERIVATIONS IN PRIME AND SEMIPRIME Γ-NEAR-RINGS
Kazaz, Mustafa,Alkan, Akin Korean Mathematical Society 2008 대한수학회논문집 Vol.23 No.4
We introduce the notion of two-sided $\Gamma$-$\alpha$-derivation of a $\Gamma$-near-ring and give some generalizations of [1, 2].
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Finite element analysis of shear-critical reinforced concrete walls
Ilker Kazaz 사단법인 한국계산역학회 2011 Computers and Concrete, An International Journal Vol.8 No.2
Advanced material models for concrete are not widely available in general purpose finite element codes. Parameters to define them complicate the implementation because they are case sensitive. In addition to this, their validity under severe shear condition has not been verified. In this article, simple engineering plasticity material models available in a commercial finite element code are used to demonstrate that complicated shear behavior can be calculated with reasonable accuracy. For this purpose dynamic response of a squat shear wall that had been tested on a shaking table as part of an experimental program conducted in Japan is analyzed. Both the finite element and material aspects of the modeling are examined. A corrective artifice for general engineering plasticity models to account for shear effects in concrete is developed. The results of modifications in modeling the concrete in compression are evaluated and compared with experimental response quantities.
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A Fuzzy Model to Determine Construction Firm Strategies
Aynur Kazaz,Bayram Er,Burcu Ezgi Ozdemir 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.7
The construction industry has a complex and dynamic environment. It consists different professions and is intertwined with other industries. This results in construction firms as very sensitive to both internal and external factors. Correct strategies should be chosen and used effectively to reduce the impact of these factors or benefit from them. In this paper, a methodology for determining proper strategies was introduced. For this purpose in the first part of the study, 50 large-scaled construction firms in Turkey were examined by a Strengths, Weaknesses, Opportunities and Threats (SWOT) analysis. In addition, each firm’s primary goal was also identified. The results obtained in the first part were used to develop a fuzzy model for determining main objectives of construction firms. The validity of the model was confirmed by testing real data of the surveyed firms. Finally, relevant strategies in accordance with the firms’ main goal were introduced. The results of the questionnaire revealed that there is high correlation between the firms’ current positions in the market and their main goals. In addition, construction firms can also be classified according to Miles and Snows’ strategy typology.
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ELEMENTARY ABELIAN COVERINGS OF REGULAR HYPERMAPS OF TYPES (5, 5, 5) AND (5, 2, 10) OF GENUS 2
Mustafa Kazaz 장전수학회 2009 Proceedings of the Jangjeon mathematical society Vol.12 No.2
In this paper, we find elementary abelian coverings of the regular hyper- maps H₁ of type {5, 5, 5} and M₁of type {5, 2, 10} of genus 2 corresponding to the orientation-preserving automorphism groups C5, the cyclic group of order 5, and C10, the cyclic group of order 10, respectively. We also determine the reflexibility of these coverings.
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Economic Viability Analysis for Fresh Concrete Waste Reclaimers: The Capacity of Leftover Concrete
Aynur Kazaz,Serdar Ulubeyli,Murat Atici 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.1
Many batching plants are reluctant in recycling the returned fresh concrete. However, leftover concrete may present great potential as it is always observed in truck-mixers. Therefore, viability of mechanical reclaimers was economically investigated considering the leftover concrete capacity. Toward this aim, availability of reclaimers in Turkey was revealed through a survey and the leftover concrete amount was measured. An economic selection algorithm for reclaimers was then introduced. Lastly, sensitivity and scenario analyses were performed for investment. In conclusion, most plants have poor views about recycling the leftover concrete although its percentage is 0.31%. With this amount, the annual leftover concrete amount in Turkey reaches a small plant’s annual production. Given viability, four inputs can have huge influence on viability and should be paid attention. Finally, the most likely and the best scenarios present an optimistic view even for small plants while the worst scenario has negative results and should be supported by incentives.
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Numerical Evaluation on the Steel Plate Shear Wall Design Parameters for Improved Cyclic Behavior
Muhammed Gürbüz,İlker Kazaz 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.2
In previous studies, the relationship between the collapse behavior of steel plate shear walls (SPSW) and the design parameters beyond the design drift limits is not addressed in the same framework. In this study, the eff ects of design parameters, such as the column fl exibility parameter, axial load level on boundary columns, column-to-beam stiff ness ratio, plate thickness and plate aspect ratio, on the deformation capacity and failure modes of steel plate shear walls are investigated in a parametric study using the fi nite element models of three-story SPSWs with rigid beam-column connections (moment-resisting frames). Models are analyzed under monotonic and cyclic loading. The ranges of parameters in combination leading to poor, moderate and improved displacement capacity, failure mechanism and energy dissipation capacity of SPSWs are identifi ed. A formula is developed to estimate the ultimate drift ratio of SPSWs using design parameters. The infi ll plate-frame interaction is investigated and it is determined that 25% of the total shear force resisted by the frame component is necessary for desired seismic behavior of SPSWs.
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