Browsing by Author "Isik, Ercan"

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Citation - WoS: 2
Citation - Scopus: 2
Assessment of the Damage Caused by the 6 February 2023 Earthquakes on Old and New Dated Reinforced Concrete Buildings in Elbistan, Turkey
(Sage Publications Inc, 2025) Aras, Fuat; Dogan, Talha Polat; Ozturk, Murat; Tun, Muammer; Isik, Ercan; Arslan, Musa Hakan
On 06 February 2023, two strong earthquakes occurred in Kahramanmara & scedil;, T & uuml;rkiye. The first earthquake with a moment magnitude (Mw) of 7.7 and an epicenter in Pazarc & imath;k, was followed by a second earthquake with a moment magnitude of (Mw) 7.6 and an epicenter in Elbistan. These earthquakes have caused catastrophic life and structural loss in ten cities where more than 15 million people permanently live. Concentrating on the epicenter of the second earthquake, Elbistan, this study investigates the main characteristics of the earthquakes and the failure of the reinforced concrete buildings. Acceleration records from both earthquakes were analyzed and site surveys were conducted to evaluate the caused damages. The high number of completely collapsed buildings highlighted the vulnerability of the general old building stock constructed before 2000. Notably, unlike previous earthquakes in T & uuml;rkiye, these earthquakes also affected new buildings constructed according to the recent Turkish Earthquake Code. In that respect, seismic damages seen in these buildings are presented and interpreted in this paper. To validate the observed deficiencies, a damaged building whose construction had just been completed but not yet occupied was both surveyed on site and subjected to non-linear performance analyses. The analysis results demonstrated that the damage distribution and locations in the models closely matched the observed damage after the earthquakes. In addition, the analyses also revealed the effect of brick infill walls on the building's seismic behavior.
Citation - WoS: 65
Citation - Scopus: 72
Investigation on Improvement in Shear Performance of Reinforced-Concrete Beams Produced With Recycled Steel Wires From Waste Tires
(Mdpi, 2022) Aksoylu, Ceyhun; Özkılıç, Yasin Onuralp; Hadzima-Nyarko, Marijana; Isik, Ercan; Arslan, Musa Hakan
In parallel with the increase in vehicle sales worldwide, waste tires are becoming an increasing problem. The storage and disposal of these waste tires are critical environmental problems. Re-using these wastes in different areas instead of being disposed of is vital in preventing environmental pollution and creating new low-cost products. From this motivation, this paper investigates the properties of traditional reinforced-concrete beam with recycled steel wires (RSWT) obtained from the waste tires. RSWT were added to reinforced-concrete beam between 1% and 3% by weight with an increment of 1%. In total, 9 cubes, 12 cylinders and 12 reinforced-concrete beams were cast and tested to obtain the compressive, splitting tensile and flexural strengths, respectively. RSWT added to the concrete by 1%, 2% and 3% increased the compressive strength by 17.2%, 30.8% and 46.4%, respectively, compared to the reference concrete. In split tensile strength, 14.4%, 25.1% and 36.7% increases were observed, respectively. This showed that there was an effective increase in the compressive and tensile strength of concrete with the increase of fiber content. Although the effect of fiber content in samples with high stirrup spacing (27 cm) provides significant benefit in improving the beam behavior, the effect of fibers was more limited as the stirrup spacing decreased (20 cm and 16 cm). An approximation of over 91% was obtained between the analytical calculations and the experimental results. This shows that the analytical calculations given in the standards can be used for new experimental studies.