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PROJELERİMİZ

116M254 

116M254 numaralı Tübitak projemiz Temmuz 2017'de başlamıştır. 

Projemiz 1001 Bilimsel ve Teknolojik Araştırma Projelerini Destekleme Programı kapsamında desteklenmiştir. 

Bilimsel ve Teknolojik Araştırma Projelerini Destekleme Programının (1001) amacı, yeni bilgiler üretilmesi, bilimsel yorumların yapılması veya teknolojik problemlerin çözümlenmesi için bilimsel esaslara uygun olan projeler desteklemektir.

214M235 

Proje Yürütücüsü:

Doç. Dr. Fuat Aras

İstanbul Medeniyet Üniversitesi

fuat.aras@medeniyet.edu.tr

fuataras@hotmail.com

Reinforced concrete buildings constitute significant part of the general buildings stock of Turkey and the population in the cities lives in those buildings. In the recent earthquakes most of the buildings located in the epicentre region of those earthquakes collapsed and caused huge economic loses and fatalities. For these reasons the investigation of the structural behaviour of the reinforced concrete buildings is important and many experimental studies have been performed. However, these studies are performed in the laboratories over the reproduced experimental structural elements (column, beam or joints), scaled frames or three dimensional models for shaking table equipment. Either the high cost of the laboratories or cost of the preparation of the experimental specimens makes it difficult to perform such experiments. Moreover the obtained results are again open to discussion due to scaling, preparation of the specimen and application of the forces.

These problems can be eliminated by the use of real structures in the experiments. Two six-storey reinforced concrete buildings, located in the North Campus of Istanbul Medeniyet University and taken from the General Directorate of State Highways are planned to be demolished for the new campus facilities of the university. In this proposed project, it is planned to use these structures as test specimens and investigate the effects of different damage levels to the dynamic characteristics of buildings with vibration analyses. The obtained vibration measurements will be used to discover new damage identification techniques and estimate the location and severity of the damages in buildings by analysing only the existing conditions. The required permission has been taken from the authority of the university.   

In the proposed project, the effects of structural damages (middle and heavy) to dynamic characteristics of reinforced concrete would be investigated. For this aim, the dynamic characteristics of the undamaged buildings will be determined. Later on the structural elements in these building will be damaged. It is important to reveal the change in the structural damages induced by the partial damages which may stem from earthquakes, vehicle crush, explosion of kitchen tube or terrorist attacks. In the framework of the project, the damages, planned to be formed in the structural elements by building demolishing machine. First one corner column, then an adjacent column to that, then the beam connecting these columns (on the ground floor) will be damaged in middle and heavy levels and for each case vibration measurements will be taken from the four corners of the top storey and damaged zones to identify the variation of the dynamic properties. Vibration records will be investigated for the possibility of the prediction of the element damages. The results are very important for the damage assessment of the reinforced concrete structures after earthquakes.  

One of the main targets of the study is to contribute the existing damage identification techniques. The obtained data from the tests would be used for the investigation of new damage identification algorithm. Moreover, the damage identification for the buildings which have no data for their undamaged phases is aimed with only the vibration record taken from their existing phase. For this aim, not only the lateral vibration records, required for the identification of the mode shapes and frequencies but also vertical records would be taken. Stemming from the damages, the variation of the vertical signal characteristics would be investigated and matched with the damage levels.

The buildings can represent the characteristics of the general building stock in Turkey. Six-storey buildings are formed by reinforced concrete frames, known as double flat apartment buildings and their earthquake performance are inadequate according 2007 Earthquake Code. In this respect, the results of the project are important for the identification of damaged building and the buildings’ damage levels.