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During the second half of the 19 th century in Europe, to take effect in the Ottoman capital, Istanbul, it was necessary to wait for the beginning of the 20 th century for the important developments in construction technology. Architect Kemaleddin, one of the important names of those years, which can be described as a transition period in terms of construction technology, skillfully benefited from the developing construction technologies in the buildings he designed, built, and produced original works in terms of construction technique as well as in the architectural style. As the first of the series of foundation inns, Vakıf Han I is an attractive work that synthesizes all available building materials and construction techniques of the period with its masonry, early reinforced concrete (Hennebique System), and steel elements. At the beginning of the 20 th century, generally mixed construction techniques were used in such buildings which were built in Eminönü and Galata regions where a rapid urban transformation process was witnessed because of the developing maritime transport and international trade. However, there are not many studies about these buildings which are important documents of the construction techniques of the period, that enlightened the design approaches on how these techniques were used together. To protect the unique character of the buildings and as well as the period, detailed researches are needed to illuminate the construction details as well as building materials, but there are also some difficulties and limitations in conducting on-site research in such building which are usually in use. In this study, Vakif Han I is investigated in terms of new construction technologies in the beginnings of 20 th century. The characterization of the original building techniques used and identification of the structural system are the purpose of the study to help for developing sustainable conservation strategies. Furthermore, the environment in which the building emerged is discussed in terms of developments in construction technologies. The structural design approaches of the period are examined through the original documents and projects obtained from the archive. The construction techniques used in the building are described by tracing the original projects in the building. The original projects of the building have been compared with the existing building by in situ observations. As a result of the comparison of original projects and existing building, it was obtained that, all available building materials and construction techniques of the period such as stone and brick masonry, early reinforced concrete (Hennebique System), and structural steel were used in Vakıf Han I, which reached today by preserving its originality. Moreover, it is determined that traditional masonry work and modern composite structural elements made of reinforced concrete (Hennebique System) and structural steel profiles were used in the construction of the building. The main structural system of the building consists of ston...

A video-based indirect sensing procedure for dynamic identification purposes is presented. To overcome major limitations of video-based methods in real on-site measurements, a novel three step pre-modification, magnification, post-modification process is developed. This process includes revision of the initial input video record in order to delete disturbing objects, utilizing a magnification method to filter the frequency content of the monitored motion and using a revision step for elimination of noises generated during magnification process. Finally, a set of digital signal and image processing analyses are performed on the modified video using virtual visual sensor technology. Based on the results of this research, motion signals of the monitored object are detected. The proposed approach has been used for identification of dynamic characteristics of two historic masonry minarets in Istanbul. Results shows that the proposed procedure is able to assess the dynamic characteristics of the monitored structure with a high-level of accuracy.

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