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Yayın Using the ultrasonic stress wave technique to evaluate structural timber members of an old masonry building(Kastamonu Univ, Orman Fak, 2018) Koca, Gülru; Dündar, Türker; As, NusretAim of study: The main objective of this study is to evaluate the current state of the structural timber members of an old masonry building by using destructive and non-destructive test methods and to determine the efficiency of non-destructive test methods by obtaining correlations between destructive and non-destructive test parameters. Area of study: Specimens were extracted from different parts of an old semi-detached masonry building in Istanbul, Turkey. The building was built at the beginning of the 20th century in Kadikoy, a residential district in the Asia side of Istanbul. Material and Methods: Ultrasonic stress wave test was carried out on specimens prepared from the structural members. Following the ultrasonic based non-destructive tests, the bending strength and modulus of elasticity in the bending tests were determined for the specimens. Main results: According to the results of the experiments, it was observed that the regression correlations were high for the softwoods (fir and spruce), but relatively lower correlations were obtained for the chestnut specimens. Highlights: Because of the good R-2 values obtained between the MOED and mechanical properties of the softwoods, the non-destructive stress wave technique can be recommended for the evaluation of softwoods in structures. Although chestnut showed very good mechanical properties, a satisfactory evaluation of the chestnut members could not be obtained because of the small number of specimens. Further investigation is needed with large sample groups.Yayın New housing trends in Istanbul(Open House Int, 2016-12) Özker, Serpil; Tuğlu Karslı, Hatice UmutExternalization that became prominent in 1980s with the globalization brought along dramatic changes in social and spatial areas. The social, cultural and economic events that took place on an international level thanks to globalization made the impact of change felt which was reflected on the urban space and, therefore, on the house, resulting in an increase in the importance of the residential sector. Externalization and developed economic structure enabled more investments into houses which introduced a concept of housing populated in urban fringes starting from the city centers. The housing concept which was shaped by the impacts of the urban transformation after 1980 turned into a new emerging lifestyle in Istanbul in 2000s. Accordingly, the study aims to establish the position of housing in Istanbul and new meanings formed by the socio-cultural changes. In this sense, housing before and after 1980, globalization, gentrification, urban transformation, spatial segregation, socio-economic and cultural aspects were discussed based on the structural benchmarks, and 4 different housing forms, namely the "Loft", "Residence", "Terraced House", and "Gated Communities", with individual structural examples. This study, thus, aims to question the form of tenancy of these houses created through varying concepts and concerns today. The results obtained showed that the housing as an indicator of cultural life in Istanbul has turned into a lifestyle that is shaped by similar aspects and commercial concern, despite different approaches or production forms, eliminating the traces of the cultural life of the society.Yayın Masif ahşap parkelerde geometrik kararlılık üzerine bazı faktörlerin etkisi(Istanbul Univ, Veteriner Fakultesi, 2013) Koca, Gülru; Arıoğlu, Nihal; As, NusretBu çalışmada; masif ahşap parkelerin geometrik kararlılığı araştırılmıştır. Ahşap parkelerin bünyesindeki geometrik değişimlerin incelenmesi amacıyla iki ağaç türünden iki farklı genişlikte elde edilen numunelere ön deney ve deneyler uygulanmıştır. Ön deneylerde numunelerin yoğunluk, radyal ve teğet doğrultuda genişleme ve daralma değerleri belirlenmiştir. Deneylerde numuneler farklı bağıl nem değerlerinde şartlandırılıp geometrik kararlılıkları belirlenmiştir. Bu aşamada numunelerin bir kısmına oluk açılmış, bir kısmı sistire edilip her işlemin ardından tekrar şartlandırılmıştır. Oluk açılmayıp sistire edilmeyen bir numune grubu da ardışık olarak şartlandırılmıştır. Deneylerin ardından numunelerin geometrik değişimleri elde edilen literatür bilgileri ve yapılan istatistiki test bulgularıyla birlikte değerlendirilmiştir. Sonuçta; parkelere oluk açılmasının geometrik kararlılığın iyileştirilmesinde fayda sağlamadığı; fakat sistire edilip ardışık döngülere tabi tutulmasının geometrik kararlılığın artmasına etki ettiği ortaya konmuştur. Ardışık olarak farklı iklim koşullarında kalan malzemenin geometrik kararlılığında genel olarak artış olduğu da bir diğer sonuçtur.Yayın Evaluation of traditional Sirince houses according to sustainable construction principles(Selcuk Univ, 2019-06) Koca, GülruSirince is a village which has unique traditional building samples and which is heavily influenced by the influx of tourists in the summer season for the last decade. Many buildings in Sirince have changed function due to tourism activities and a significant amount of them have been renovated. Besides, some new buildings has been constructed from modern building materials such as reinforced concrete in the settlement. Since the management plan has not yet put into force in the region, excessive interventions can be seen in renovations and restorations. However, the settlement is still facing a decrease in population for some reasons. In order to preserve the population of Sirince the sustainability of the region has to be ensured and the existing historical and architectural texture has to be preserved. This study mainly focuses on the evaluation of Sirince according to sustainable construction principles and suggests some interventions in order to increase the sustainability. As a first statement it can be mentioned that, tourism has to be viewed as a means rather than an end to improve the sustainability of the settlement. The constructions has to be carried out according to ecology based principles, a healthy built environment has to be created and non-renewable natural sources has to be used efficiently to increase the sustainability in constructions. Excessive restoration interventions has to be prevented, traditional materials and techniques has to be preserved. Reusing and recycling of materials has to be evaluated in order to make environment-friendly applications.
