Sürdürülebilir Kalkınma Amaçları
Yayınlar
- ArticleAçık Erişim20262023 Kahramanmaraş Depremleri sonrasında Malatya’daki yığma binaların sismik performansı: Saha incelemesi ve nümerik analizler
Turan, Ahmet Ihsan; Celik, Alper
Türkiye, aktif deprem kuşağında yer almakta olup tarih boyunca yıkıcı depremler yaşamıştır. 6 Şubat 2023 Pazarcık (Mw 7.7) ve Elbistan (Mw 7.6) depremleri, özellikle bölgede yaygın olan mühendislik hizmeti almamış yığma yapılarda büyük hasara yol açmıştır. Bu çalışma, Malatya ilindeki yığma yapı stokunda gözlenen hasar türlerini incelemekte ve saha gözlemlerine dayanarak bu hasarların olası nedenlerini tartışmaktadır. Nitel bulguları desteklemek amacıyla, temsilî az katlı yığma yapı prototiplerinin deprem davranışını karşılaştırmalı olarak değerlendiren sayısal analizler gerçekleştirilmiştir. Doğrusal-elastik yanıt spektrumu analizleri ve modal esaslı yaklaşım kullanılarak iki ana parametre dikkate alınmıştır: taşıyıcı duvar malzemesi türü (dolu kil tuğla, boşluklu kil tuğla ve gazbeton) ve kat sayısı (1–3). Saha gözlemleri, yapı stokunun önemli bir bölümünün yeterli mühendislik hizmeti olmadan inşa edildiğine işaret etmekte; ayrıca katlar arasında farklı yığma birimlerinin kullanılması gibi düzensiz uygulamaların kritik zafiyetlere yol açabildiğini göstermektedir. Sayısal sonuçlar da rijitlik ve deplasman taleplerinin hem yığma birimi türüne hem de yapı yüksekliğine güçlü biçimde bağlı olduğunu ortaya koymakta ve özellikle daha hafif yığma sistemlerde kat sayısı arttıkça daha olumsuz talep eğilimlerinin gelişebileceğine işaret etmektedir.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2024Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)
Ihsan Turan, Ahmet; Celik, Alper; Kumbasaroglu, Atila; Yalciner, Hakan
Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2022An experimental study on seismic performance levels of highly corroded reinforced concrete columns
Celik, Alper; Yalciner, Hakan; Kumbasaroglu, Atila; Turan, Ahmet İhsan
In the literature, only one empirical model is available as a nondestructive method for the prediction of seismic performance levels of corroded reinforced concrete (RC) columns as a function of the initial corrosion crack width at lower corrosion levels. Because of the ruptured transverse reinforcement bars at higher corrosion levels, the structural behavior may turn brittle in terms of shear failure. Therefore, in this study, higher corrosion levels for a different concrete strength level from that empirical model were studied. To do this, four RC columns were subjected to accelerated corrosion, and the widths of initial corrosion cracks were measured. The corroded RC columns were then tested under combined constant axial load and cyclic lateral displacement excursions. After the cyclic loading test, the actual corrosion levels at each reinforcement bar were obtained by extracting the reinforcement bars from the concrete. Test results showed that the prediction of seismic performance levels of corroded RC columns based on initial corrosion crack widths were limited owing to the nonlinear increase in the crack width with the increase in the corrosion levels. New empirical models were developed to predict the remaining energy capacities and seismic performance levels of the corroded RC columns.
RDL Kalıcı Kaydıİncele - Conference ObjectYalnız künye2021Cyclic loading test on highly corroded reinforced concrete columns
Celik, Alper; Yalciner, Hakan; Kumbasaroglu, Atila; Turan, Ahmet Ihsan; Belletti, B.; Coronelli, D.
An experimental study was performed on five reinforced concrete (RC) columns to investigate the structural behavior of highly corroded RC columns. Four of the RC columns were corroded using an accelerated corrosion method for different corrosion levels at longitudinal bars as 15.4, 20.2, 27.3 and 28.3%. RC columns were tested under cyclic load for a constant axial load ratio of 0.40. After the loading test, the actual corrosion levels were obtained by extracting the longitudinal bars and stirrups following the breaking of the RC columns. Load-displacement curves, ductility ratios and energy absorption capacities of tested RC columns were obtained. Test results revealed that the ductility ratios of corroded RC columns should be determined in accordance with energy-based or bilateral failure criteria due to the misleading of increased ductility ratios of corroded RC columns based on the displacement method.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2021Effect of polypropylene fibers on the development lengths of reinforcement bars of slabs
Kumbasaroglu, Atila; Yalciner, Kürşad; Yalciner, Hakan; Turan, Ahmet I.; Celik, Alper
Ductile behavior is one of the most important earthquake indicators that must be possessed by structures. Because of the limited tensile strength of concrete, alternative materials such as structural nanosynthetic fibers as three-dimensional reinforcement bars have gained increasing popularity over several decades. However, the contribution of fibers to the development length of reinforcement bars has not been investigated. Therefore, an experimental study was conducted to investigate the effects of polypropylene fibers on the development lengths of reinforcement bars. Thirty-three reinforced concrete (RC) slabs at three different volume fractions of fibers of 0.0, 1.0 and 1.5 % at different embedment lengths of reinforcement bars were investigated under four-point flexural strength tests. Load-displacement curves, energy absorption capacities, ductility ratios and bond-slip relationships were obtained for different embedment lengths of reinforcement bars with three different amounts of fibers in RC concrete slabs. The test results revealed that the predominant effects of fibers on structural behavior pertained to the energy absorption capacities at plastic deformation. It was found that resisting more strains by reinforcement bars with the help of added polypropylene fibers resulted in the regaining of ductile behavior due to the reduced embedment lengths of the reinforcement bars.
RDL Kalıcı Kaydıİncele