Browsing by Author "Arslan, H. Derya"

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Citation - WoS: 7
Citation - Scopus: 9
Experimental and Numerical Investigation of the Structural, Thermal and Acoustic Performance of Reinforced Concrete Slabs With Balls for a Cleaner Environment
(Springer Int Publ Ag, 2023) Arslan, Musa Hakan; Özkilic, Yasin Onuralp; Arslan, H. Derya; Sahin, Ömer Sinan
This study conducted a comprehensive experimental and numerical assessment to investigate the effect of plastic circular balls placed in the middle of a section of a reinforced concrete slab on strength, ductility, thermal, and acoustic performance. The ball diameter/slab thickness (D/H), grades of concrete, and longitudinal tensile reinforcement ratio (rho) in the slab were selected as the main variables. The variation in thermal and acoustic performance depending upon the ball's diameter was investigated as well. The results showed that the slab's load-carrying capacity, ductility, and energy dissipation capacity did not differ if the D/H ratio did not exceed 0.4; however, significant decreases in these values were observed when the D/H ratio exceeded 0.4. Moreover, the increase in the concrete and reinforcement's strength had a negative effect on the slab with a D/H ratio of 0.8. The experimental results revealed that balled slabs are 3.15 times superior with respect to thermal conductivity and provide 1.38 times more insulation to absorb sound compared to non-balled slabs. In the numerical study of the slabs' thermal performance, the mean surface temperature and heat flux on the slab where the heat transfer takes place decreased as the ball diameter increased. As seen in acoustic models, the level at which the slabs absorbed sound varied depending upon both the diameter of the balls and the sound frequency.
Multistage Evaluation of Strengthening Strategies for Achieving Adequate Seismic Performance in Reinforced Concrete School Buildings
(Elsevier Science Inc, 2026) Timurlenk, Piril; Uysal, Yusuf; Arslan, H. Derya; Arslan, M. Hakan
It is crucial that socially important structures, such as schools, remain operational without sustaining damage after earthquakes. However, some public buildings in Turkey have not received adequate engineering services, making it necessary to evaluate the seismic performance of these structures and apply appropriate strengthening methods when deemed necessary. This study comprehensively examines potential strengthening strategies and their effects on various school buildings in Turkiye, a country located in a highly active seismic zone with a vulnerable public building stock. Three commonly used school building types (8, 14, and 22 classrooms) were selected. Parametric studies were conducted on buildings with insufficient seismic performance, evaluating different strengthening scenarios. Input parameters included varying peak ground acceleration (PGA) values reflecting regional seismicity, diverse local soil conditions, and different material strengths. Strengthening strategies such as reinforced concrete jacketing, shear wall addition and FRP wrapping were applied to columns. A total of 432 structural models were analyzed. One or more of these methods were used to achieve the target performance level. Results were interpreted based on structural strength, period, over-strength factor and cost. It was found that the combination of shear wall addition and jacketing had the most significant impact on structural period, leading to notable reductions in spectral displacement demands. However, this combination also resulted in higher over-strength factors and increased strengthening costs compared to other methods. The study concludes that the absence of over-strength targets for retrofitted buildings in seismic codes is a critical gap and should be addressed in future code revisions.