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- 저자 : Muhammet Karabulut (검색결과 3 건)
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Muhammet Karabulut,Murat E. Kartal 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.25 No.3
This study presents comparation of fixed and viscos boundary condition effects on three-dimensional earthquake response and performance of a RCC dam considering linear and non-linear response. For this purpose, Cine RCC dam constructed in Aydın, Turkey, is selected in applications. The Drucker-Prager material model is considered for concrete and foundation rock in the nonlinear time-history analyses. Besides, hydrodynamic effect was considered in linear and non-linear dynamic analyses for both conditions. The hydrodynamic pressure of the reservoir water is modeled with the fluid finite elements based on the Lagrangian approach. The contact-target element pairs were used to model the dam-foundation-reservoir interaction system. The interface between dam and foundation is modeled with welded contact for both fixed and viscos boundary conditions. The displacements and principle stress components obtained from the linear and non-linear analyses are compared each other for empty and full reservoir cases. Seismic performance analyses considering demand-capacity ratio criteria were also performed for each case. According to numerical analyses, the total displacements and besides seismic performance of the dam increase by the effect of the viscous boundary conditions. Besides, hydrodynamic pressure obviously decreases the performance of the dam.
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Earthquake response of roller compacted concrete dams including galleries
Muhammet Karabulut,Murat Emre Kartal 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.72 No.2
The effect of galleries on the earthquake behavior of dams should be investigated to obtain more realistic results. Therefore, a roller compacted concrete (RCC) dam with and without galleries are examined under ground motion effects. For this purpose, Cine RCC dam constructed in Aydın, Turkey, is selected in applications. The optimal mesh around galleries is investigated to obtain the most realistic results. Two-dimensional finite element models of Cine RCC dam with and without galleries are prepared by using ANSYS software. Empty and full reservoir conditions were taken into account in the time-history analyses. Hydrodynamic effect of the reservoir water was taken into account considering two-dimensional fluid finite elements based on the Lagrangian approach. It is examined that how principle stresses and displacements change by height and during earthquake. The dam-foundation-reservoir interaction was taken into consideration with contact-target element pairs. The displacements and principle stress components obtained from the linear analyses are compared each other for various cases of reservoir water and galleries. According to numerical analyses, the effect of galleries is clear on the response of RCC dam. Besides, hydrodynamic water effect obviously increases the principle stress components and horizontal displacements of the dam.
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Hayri Aslan,Muhammet Ali Karabulut,Hacı ?lhan,Ozgur Ozdemir 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
In this paper, we study effects of co-channel interference in decode-and-forward based cooperative communication systems with best relay selection using cooperative-maximum ratio combining (C-MRC), link-adaptive regeneration (LAR) and maximum ratio combining (MRC) at the destination over Rayleigh fading channels. In order to increase the performance of system, we use the best relay selection criteria where selected relay has the minimum bit error probability of proposed system. We assume that the destination terminal is corrupted by multiple co-channel interferences, while the relay terminals are perturbed by only additive white Gaussian noise (AWGN). The Monte Carlo simulations are provided to confirm analytical results and illustrate the effect of interference.
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