Yazar "Karasin, Abdulhalim" seçeneğine göre listele

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    The effect of different earthquake ground motion levels on the performance of steel structures in settlements with different seismic hazards
    (Techno-Press, 2022) Isik, Ercan; Karasin, Ibrahim Baran; Karasin, Abdulhalim
    The updated Turkish Building Earthquake Code has been significantly renovated and expanded compared to previous seismic design codes. The use of earthquake ground motion levels with different probabilities of exceedance is one of the major advances in structural mechanics with the current code. This study aims to investigate the earthquake performance of steel structure in settlements with different seismic hazards for various earthquake ground motion levels. It is focused on earthquake and structural parameters for four different ground motion levels with different probabilities of exceedance calculated according to the location of the structure by the updated Turkish Hazard Map. For this purpose, each of the seven different geographical regions of Turkey which has the same seismic zone in the previous earthquake hazard map has been considered. Earthquake parameters, horizontal design elastic spectra obtained and comparisons were made for all different ground motion levels for the seven different locations, respectively. Structural analyzes for a sample steel structure were carried out using pushover analysis by using the obtained design spectra. It has been determined that the different ground motion levels significantly affect the expected target displacements of the structure for performance criteria. It is noted that the different locations of the same earthquake zone in the previous code with the same earthquake-building parameters show significant variations due to the micro zoning properties of the updated seismic design code. In addition, the main innovations of the updated code were discussed.
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    EXPERIMENTAL CONFIRMATION FOR THE VALIDITY OF RITZ METHOD IN STRUCTURAL DYNAMIC ANALYSIS
    (Polish Soc Theoretical & Applied Mechanics, 2014) Aktas, Gultekin; Karasin, Abdulhalim
    The issue of Ritz vectors and their advantages is well-known in the field of structural engineering. This study deals with Ritz analysis and its experimental support. To that end, two different precast concrete molds were handled. Experiments were performed under vibration with the use of a computer-based data acquisition system. Transducers were used to measure displacement histories on the mold. Three dimensional finite element (3D FEM) simulation modeling of the concrete mold was carried out to obtain deflection histories on the mold. The computed displacement histories were compared with the experimental testing results. The comparisons show that the experimental and numerical results are compatible.
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    An Experimental Study on Strength and Durability for Utilization of Fly Ash in Concrete Mix
    (Hindawi Ltd, 2014) Karasin, Abdulhalim; Dogruyol, Andmurat
    The intention of this study is to discuss the variation of concrete exposed to high sulfate environment of a specific region with respect to strength and durability. Secondly, it is aimed to discuss the possibility of reducing the cement amount in construction of concrete structures. For this purpose, laboratory tests were conducted to investigate compressive strength and sulfate resisting capacity of concrete by using 20% fly ash as mineral additives, waste materials, instead of cement. As a case study the soil samples, received from Siirt Province areas which contain high sulfate rate, have been compared with respect to sulfate standard parameters of TS 12457-4. In such regions contact of underground water seep into hardened concrete substructures poses a risk of concrete deterioration. In order to determine the variation of strength and durability for concrete exposed to such aggressive environment, the samples were rested in a solution of Na2SO4 (150 g/lt) in accordance with ASTM C 1012 for the tests. As a result of this experimental study, it is noted that the use of 20% fly ash, replacement material instead of cement, has no significant effect on compressive strength of concrete over time.
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    Failures of masonry dwelling triggered by East Anatolian Fault earthquakes in Turkey
    (Elsevier Sci Ltd, 2020) Yon, Burak; Onat, Onur; Oncu, Mehmet Emin; Karasin, Abdulhalim
    Turkey is located on active fault zones such as the East Anatolian Fault (EAF), the North Anatolian Fault (NAF) and the Anatolian-Aegean Subduction Zone (AASZ). Ground seismicity activities of the NAF zone are relatively active compared with other faults. Eleven high-intensity earthquakes have been produced on this fault zone since 1939. Whereas the EAF zone was relatively quiescent in the last century, on the basis of historical records, destructive seismic activities occurred on the EAF zone in the last two decades. In this study, the rupture reason of faults, updated active fault data, and seismic maps are presented briefly. Moreover, failure reasons and failure mechanism of conventional masonry structures damaged from seismic ground motions on the EAF zone are evaluated in detail. Possible solutions are suggested on the basis of seismic codes. For this purpose, EAF-sourced earthquakes, i.e. 2003 Bingo', 2010 Kovancilar (Elazig), 2011 Maden (Elazig), 2011 Tabanli (Van) and Edremit (Van) hit in last two decades on this fault are investigated. Failures of conventional masonry buildings triggered from these earthquakes are assessed. Statistical evaluation, damage of earthquakes and failure pattern are deeply investigated and revealed. Eventually, one of the most significant reasons of severe damage or collapse to masonry structures due to this seismicity is the inability to construct the structures according to the requirements of seismic codes.
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    Seismic performance evaluation of existing reinforced concrete buildings using simplified displacement-based approach
    (Pamukkale Univ, 2024) Ceylan, Harun; Karasin, Abdulhalim; Erdil, Baris
    While evaluating the seismic performance of existing buildings according to TBC2018, a difficulty and complexity arouses in estimating the rotations that occur at both ends of the load carrying elements under seismic forces. Therefore, in this study, it is aimed to develop a reliable method for estimating the seismic performance of reinforced concrete (RC) buildings using simplified displacement-based formulations. Within the scope of this study, 4 RC buildings having same symmetrical floor plan but with varying number of stories, different material strengths were designed, and 3 existing RC buildings were taken into consideration. All the 7 buildings were modeled using common structural analysis software like SAP2000v20, Sta4CADv14.1, & Idot;deCADv10 and ProtaStructure2022 and linear seismic performance analysis were performed. The data obtained as a result of the analysis were processed into the displacement-based formulations created within theframeworkof this study to determine the damage state of the columns and associated seismic performance of the existing RC buildings considering the general principles and rules given in TBC2018. It was determined that the compatibility between the column damage conditions determined according to the proposed method and the column damage status determined as a result of the hand calculation made according to the calculation principles specified in TBC2018 was 100% in both principal directions. In addition, it is found that the resultsfoundfrom the proposed method were conservative and generally compatible with the results obtained from the common structural analysis software.