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.

Tarih boyunca Anadolu toprakları, birçok medeniyete ev sahipliği yapmıştır. Bu sebeple ülkemizde tarihi yapılar azımsanmayacak sayıdadır. Bununla birlikte ülkemizin, aktif deprem kuşağı içerisinde yer alması sebebiyle birçok tarihi yapı, meydana gelen depremlerden zarar görmüş veya yıkılmıştır. Kültür mirası açısından önem arz eden tarihi yapılarımızın, gelecek kuşaklara güvenle aktarılabilmesi için sismik performans seviyelerinin doğru ve hızlı bir şekilde belirlenerek gerekli müdahalelerin yapılması oldukça önemlidir. Çalışma kapsamında örnek olarak ele alınan Tarihi Yanıkoğlu Camisinde yapılan ölçümler ve gözlemlere dayalı olarak yapının analitik modeli oluşturulmuştur. Yapı konumuna özel olarak seçilen deprem spektrumları ile eşdeğer deprem yükü hesaplanmıştır. Yapının kendi ağırlığı ve hesaplanan deprem kuvvetleri altında yapılan analizlerden elde edilen sonuçlara bağlı olarak yapının sismik performans düzeyi 2017 yılında Vakıflar Genel Müdürlüğünce yayımlanan Tarihi Yapılar İçin Deprem Risklerinin Yönetimi Kılavuzuna göre belirlenmiştir. Bu çalışma ile tarihi yığma yapıların sismik performanslarının değerlendirilmesinde eşdeğer deprem yükü yöntemi kullanılarak pratik bir yaklaşım ortaya konulmuştur.

Turkey is a country that is vulnerable to earthquakes and has experienced many major earthquakes that completely destroyed or caused significant damage to numerous historic structures. Today, using computer software, it is important to numerically model and analyze historic structures that need significant restoration and strengthening, to evaluate them from a perspective of seismic resistance, and to reinforce them without altering their originality. In this study, a finite element model of the historic Tigris Bridge on the Tigris River was created. First, the stresses and deformation caused by its own weight were determined. Subsequently, dynamic analyses were performed in the time domain using past earthquake ground motion records. Displacement and stress values obtained for each earthquake record in these time domain analysis were compared to each other to evaluate the seismic behavior of the bridge comparatively. The seismic performance of the bridge was determined on the basis of the "Guidelines on the Management of Earthquake Risks for Historic Structures" published by the Directorate General of Religious Foundations in Turkey.

No abstract