İnel, Mehmet
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Inel, M Inel M. Inel, Mehmet M. İnel M. Inel İnel, Mehmet. Inel, Mehmet. İnel, M. Inel, M. İnel, Mehmet.
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minel@pau.edu.tr
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10.02. Civil Engineering
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61
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| Journal | Count |
|---|---|
| Engineering Structures | 5 |
| PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE | 4 |
| Earthquake and Structures | 3 |
| Pamukkale University Journal Of Engineering Sciences-Pamukkale Universitesi Muhendislik Bilimleri Dergisi | 3 |
| Teknik Dergi/Technical Journal of Turkish Chamber of Civil Engineers | 2 |
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Article Effects of pounding on displacement demands in mid-rise RC buildings(Pamukkale Univ, 2021) Kamal, Muhammet; Inel, MehmetIn this study, the effects of pounding on seismic behavior of mid-rise reinforced concrete (RC) adjacent buildings with insufficient separation distance were investigated. 5, 8, 10, 13 and 15-storey RC building models were created to represent mid-rise buildings. The nonlinear behavior properties of these models are reflected by plastic hinges defined at the column and beam ends. The buildings are modeled as a three dimensional (3D) column-beam frame system. Adjacent building models are derived, which are connected from floor to floor level using Kelvin contact elements. Total of 30 different adjacent building models were created with the use of buildings having different number of floors. The 0 m gaps reflect inadequate separation distance between adjacent buildings while the 5 m gap is used for the reference building without collision. In order to investigate the pounding effects between adjacent buildings, 22 real acceleration records compatible with TBEC-2018 were selected and scaled. Total of 660 3D nonlinear time history analyses were carried out and the roof displacement demands obtained from these analyses were compared for collision and without collision cases The outcomes of this study show that significant changes may occur in the building displacement demands due to the collision of the mid-rise RC neighboring buildings with insufficient seismic gap. Based on the findings obtained on significant number of adjacent building pairs with different period ratios, the displacement amplification factors (beta) are proposed for the mid-rise RC buildings.Master Thesis Düşük ve orta yükseklikteki binalarda zemin sınıfı ve lokasyonun yeterli derz mesafesi üzerindeki etkileri(2024) Koşar Avcı, Verdanur; Koşar, Verdanur; İnel, MehmetÇalışma 2018 Türkiye Bina Deprem Yönetmeliği’ne (TBDY-2018) göre tasarlanmış 3, 4, 5, 6, 7, 8, 9 ve 10 katlı bitişik betonarme binalar arasında meydana gelen deprem etkileşimini önlemek için gerekli olan minimum derz mesafelerini araştırmıştır. Oluşturulan 56 farklı ikili bina modelinin üç farklı sismik lokasyon ve üç farklı zemin tipi üzerinde inşa edildiği varsayılmıştır. TBDY-2018 ile uyumlu 11 farklı deprem kaydı çifti (22 kayıt), üç farklı zemin tipi (ZC, ZD ve ZE) ve üç farklı lokasyon (Denizli, Kocaeli ve Adana) kullanılarak toplamda 11088 adet doğrusal elastik olmayan dinamik analiz yapılarak gerekli deprem derz mesafeleri elde edilmiştir. Elde edilen derz mesafeleri TBDY-2018 tarafından önerilen yöntemle kıyaslanmıştır. Çalışma sonuçları göz önüne alındığında, farklı zemin tipleri ve sismik lokasyonlar için sadece bina yüksekliğine dayanan derz mesafe hesabının yetersiz sonuçlar verdiği görülmüştür. Bitişik nizamlı binalar arasındaki gereken deprem derz mesafelerini tahmin etmek için çalışma kapsamında dört farklı basit yaklaşım önerilmiştir. Statik analiz gerekmeden bina yüksekliği, periyot oranı, lokasyon ve zemin tipi parametrelerine bağlı olarak derz mesafesi önerilen yaklaşımlarla kolay ve kullanışlı bir şekilde hesaplanabilir hale getirilmiştirArticle Citation - WoS: 17Citation - Scopus: 15Seismic performance evaluation of school buildings in Turkey(Techno Press, 2008-11-30) Inel, Mehmet; Ozmen, Hayri Baytan; Bilgin, HuseyinThis study evaluates seismic performance of the school buildings with the selected template designs in Turkey considering nonlinear behavior of reinforced concrete components. Six school buildings with template designs were selected to represent major percentage of school buildings in medium-size cities located in high seismic region of Turkey. Selection of template designed buildings and material properties were based on field investigation on government owned school buildings in several cities in western part of Turkey. Capacity curves of investigated buildings were determined by pushover analyses conducted in two principal directions. The inelastic dynamic characteristics were represented by equivalent single-degree-of-freedom (SDOF) systems and their seismic displacement demands were calculated under selected ground motions. Seismic performance evaluation was carried out in accordance with recently published Turkish Earthquake Code that has similarities with FEMA-356 guidelines. Reasons of building damages in past earthquakes are examined using the results of performance assessment of investigated buildings. The effects of material quality on seismic performance of school buildings were investigated. The detailed examination of capacity curves and performance evaluation identified deficiencies and possible solutions for template designs.Article Citation - WoS: 2Citation - Scopus: 7Determination of period of RC buildings by the ambient vibration method(Hindawi Limited, 2019-01) Inel, Mehmet; Ozmen, Hayri Baytan; Cayci, Bayram TanikDetermining the dynamic properties of structures is important for understanding their seismic behaviour. Ambient vibration signal measurement is one of the approaches used to determine the period of structures. Advantages of this method include the possibility of taking real-time records and presenting nondestructive and rapid solutions. In this study, natural vibration periods are calculated by taking ambient vibration signal records from 40 buildings. The height of the building, infill wall effect, presence of seismic retrofit, and presence of damage are taken into consideration, and their effects on natural vibration periods are investigated. Moreover, the results are compared with the analytical methods to reveal the differences. A significant correlation between the period and height of the building is observed. It is seen that the natural vibration periods of the buildings decrease by 7% to 30% (15% on average) due to infill wall contribution. However, the efficiency of infill walls decreases as the building height increases. Another significant result is that adding shear walls substantially decreases the vibration period values by 23% to 33% with respect to the shear wall ratio. When the analytical estimates and measured building period results are compared, it is seen that analytical models have closer period estimates before infill walls are implemented. The limited data in scope of the study suggest that significant differences may present in the analytical and measured periods of the buildings due to infill wall contributions. © 2019 Mehmet Inel et al.Master Thesis Orta ve yüksek katlı betonarme binaların sismik performansının iki boyutlu çerçeve modeller kullanılarak değerlendirilmesi(Pamukkale Üniversitesi Fen Bilimleri Enstitüsü, 2019) Atayı, Nesar Ahmad; İnel, MehmetTürkiye sismik olarak aktif bir coğrafyada yer almaktadır. Geçmişte meydana gelen birçok yıkıcı deprem nedeniyle büyük can ve mal kaybı yaşanmıştır. Bu nedenle, depremlerin sebep olabileceği hasar seviyelerinin tahmin edilebilmesi deprem mühendisliği açısından büyük önem arz etmektedir. Gerçekleştirilen çalışmanın amacı kuvvetli yer hareketi parametreleri ile sismik talepler arasındaki ilişkinin araştırılmaktadır. Bu kapsamda 12 adet iki boyutlu betonarme çerçeve modeli 40 ivme kaydı altında doğrusal elastik ve doğrusal elastik olmayan zaman tanım alanında analiz yapılmıştır. Toplam 960 zaman tanım alanında analizin gerçekleştirildiği çalışmada her iki analiz yöntemi için deplasman talepleri ve V/W Oranı (taban kesme kuvveti ile bina ağırlığı oranı) elde edilerek güçlü yer hareketi parametreleri karşılaştırılmıştır. Analiz sonuçları incelendiğinde yer hareketi parametreleri ile doğrusal modeller için elde edilen talepler arasında doğrusal olmayan modellere oranla daha yüksek bir korelasyon gözlemlenmiştir. Yapı dinamik tepkisinin doğrusal modellerde zamana bağlı olarak değişmemesi nedeniyle bunun beklenen bir durum olduğu söylenebilir. Elde edilen talepler ile en yüksek korelasyonun hesaplandığı her hareketi parametresi Housner Intesity’dir. Çatı katı deplasman talepleri ve housner intensity için korelasyon katsayıları sırasıyla 0.76 ve 0.66 olarak hesaplanmıştır. Doğrusal modeller için spektral ivme talebi ile yüksek bir korelasyon bulunurken, doğrusal olmayan davranış özellikleri dikkate alındığında büyük oranda düşmektedir. Regresyon analizi ile türetilen denklem ile doğrusal ve doğrusal olmayan modeller için elde edilen çatı katı deplasman talepleri, taban kesme kuvveti ve V/W ile parametreler arasındaki korelasyon katsayıları sırasıyla 0.9486, 0.8049, 0.7108 ve 0.8314 olarak elde edilmiştir. Türetilen denklem SaT1 (bina periyoduna denk gelen spektral ivme) için elde edilen korelasyon katsayısıyla anlamlı bir gelişim gösterdiğini söylenebilir.Conference Object Citation - Scopus: 2The scaled nonlinear dynamic procedure [Conference Paper](2004) Aschheim M.; Tjhin T.; Comartin C.; Hamburger R.; Inel M.A preliminary version of a new seismic analysis procedure is presented. The Scaled Nonlinear Dynamic Procedure (NDP) overcomes inaccuracies associated with other methods of analysis and can readily be used in conjunction with the Nonlinear Static Procedure (NSP) for performance-based seismic design and evaluation.Article Citation - WoS: 52Citation - Scopus: 58Observations on the building damages after 19 May 2011 Simav (Turkey) earthquake(2012-12-30) Inel, Mehmet; Ozmen, Hayri Baytan; Akyol, ErdalAn earthquake with a magnitude of 5. 7 ML has struck Simav, Kutahya located in the western part of Turkey on May 19, 2011. The ground motion caused observable damage within 25 km radius from the epicenter. Although the earthquake is moderate, its effects on the structures are serious. This paper presents the observations on seismic damages of reinforced concrete (RC) and masonry structures. Common reasons of damage in RC buildings are: low quality of concrete, detailing mistakes of reinforcement, short column, pounding, overhangs and misconstructed gable and outer infill wall parts. Interesting cases related to these deficiencies are reported. Damages in the masonry buildings are due to lack of connection between orthogonal walls and unsuitable location and dimension of openings. The damages at structures are more noticeable at regions with unfavorable soil conditions like plain regions or foothills. However, on stiffer soils at hilly sides, the damages seem to be more limited and masonry structures are observed to be less affected compared to the RC ones. The damages in RC buildings found to be increasing with story number for light damage states. However, for heavier damage states, 4-5 story buildings are observed to be the most damaged. © 2012 Springer Science+Business Media Dordrecht.Article Citation - WoS: 95Citation - Scopus: 110Re-evaluation of building damage during recent earthquakes in Turkey(2008-02) Inel, Mehmet; Ozmen, Hayri Baytan; Bilgin, HuseyinOver the past two decades Turkey has been hit by several moderate to large earthquakes that resulted in significant loss of life and property. A remarkable number of casualties and heavily damaged or collapsed buildings has emphasized inadequate seismic performance of multistory reinforced concrete buildings, typically three to seven stories in height. This study aims to evaluate seismic performance of the most common reinforced concrete building stock in Turkey considering nonlinear behavior of the components. A sample building set is selected to reflect existing construction practice; regular buildings and buildings with irregularities such as soft story, heavy overhangs, short columns, and soft story with heavy overhangs. Ductile and non-ductile details are taken into account by transverse reinforcement amount. Capacity curves of the investigated building set are determined by pushover analyses conducted in two principal directions. The inelastic dynamic characteristics are represented by equivalent single-degree-of-freedom (SDOF) systems. Their seismic displacement demands are determined using nonlinear response history analysis under selected ground motions. Seismic performance evaluation is carried out in accordance with the recently published Turkish Earthquake Code (2006) that has similarities with FEMA-356 guidelines. Analytical damage evaluation in this study has shown that the seismic effects of earthquakes experienced in Turkey are significant and some of the earthquakes impose excessive displacement demands. Therefore, a considerable portion of existing building stock may not be safe enough in Turkey or similar countries. Also, it is observed that structural irregularities affect seismic performance of buildings. Short columns and soft story with heavy overhangs have the most negative effect. © 2007 Elsevier Ltd. All rights reserved.Article Citation - WoS: 3Evaluation of reasons of the damages after Simav and Van (2011) earthquakes(PAMUKKALE UNIV, 2013) Inel, Mehmet; Ozmen, Hayri Baytan; Cayci, Bayram TanikTurkey is located on a region with high seismicity. The intense seismic activity in 2011, especially Simav and Van earthquakes, once again reminded of this fact. The aim of this study is to give information on the causes of the heavy damage and loss of lives after these earthquakes which are not incompliance with engineering principles. Based on the investigations, the damaged buildings are found to have similar deficiencies as inadequate detailing, material properties, faults in application and design. The most important reasons of the collapses are insufficient strength of joint regions and lap splice lengths. The following flaws are: inadequacies in amount or/and detailing of the lateral reinforcements, short column, overhang and soft story effects, deficient isolation applications and gable wall construction, low concrete strength, pounding and collision between buildings and faulty load bearing system designs. The other remarkable observations after the earthquakes are: the dependency of the seismic damages to some other parameters beside distance to the epicenter, adequate performances of the retrofitted buildings, total collapse of even shear-wall buildings with heavy flaws, buildings with high concrete strength may be heavily damaged, buildings with flexible load carrying system may take significant architectural damage without structural, for moderate and heavy damages 4-5 story buildings are the most damaged ones, even the multi story adobe buildings that are built in accordance with technical provisions may survive the earthquake without damage, therefore the main reason for the devastation is the violation of the engineering principles.Article Strength reduction factors for existing mid-rise RC buildings for different performance levels(2018) Ozmen, Hayri Baytan; İnel, MehmetMany earthquake prone countries have significant amount of existing deficient buildings to be evaluated for seismic actions. Although nonlinear methods are more preferable for assessment of existing buildings, most of the practicing engineers are unfamiliar to these methods. Therefore, linear methods seem to be in use in the near future for assessment of great number of deficient existing buildings in a reasonable time. In linear methods, nonlinear behaviour is taken into account by a single parameter: strength reduction factor (R) which is used to greatly reduce the elastic force demand accounting for the nonlinear behaviour. This study evaluates the use of R factors for different ductility and performance levels of buildings with respect to different soil site class. It is observed that the R factors: decrease with increasing periods, are more sensitive for higher performance levels, may change more than 30% with respect to number of story or transverse reinforcement amount, and may change 20% depending on the site class. However, effect of site class is generally smaller and a clear trend is not observed. Exemplary R values for different ductility, performance levels and number of stories are provided in the study.