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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

Project Summary

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. Van and Erciş earthquakes in 2011 confirmed these general observations. 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 executed in the laboratories over the structural elements (column, beam or joints) and scaled frames produced as experimental specimens. Recently shaking table experiments which require huge experimental facilities provides more realistic results. On the other hand 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, encountered in the experimental studies can be eliminated by the use of real structures in the experiments. Clearly this situation has many technical and economic problems. The application of non-destructive methods to the real structures can be admissible but it can give very limited information about the structure and the reliability of that information can be discussed while destructive experiments cannot be allowed by the owners. However, recently urban renewal projects provided many discarded buildings especially in Turkey. A similar situation is valid for the two seven-storey reinforced concrete buildings located in the North Campus of Istanbul Medeniyet University taken from the General Directorate of State Highways. Constructed in 1980s, these buildings will be demolished for the new campus project of the Istanbul Medeniyet University. In this proposed project, it is planned to use one of these buildings to investigate an important issue in Civil Engineering discipline. The required permission has been taken from the authority of the university.    

 

In the proposed project, the contribution of the partition walls into dynamic behaviour of the reinforced concrete building is investigated. For this aim, the dynamic properties of the existing building will be determined by Ambient Vibration Analysis This method is a frequently applied methods for the determination of dynamic properties of existing structures. Later on, the partition walls on the ground floor will be demolished without damaging the structural members in the building and ambient vibration analysis will be repeated. Just before that, partition wall specimens will be taken to test in laboratory. Comparison of the dynamic properties (periods, damping ratios and mode shapes) of the building with and without partition walls will reveal the effect of the partition walls on the dynamic properties of the building.

 

Moreover the results will be used to validate the numerical model of the building, constructed with and without the partition walls. Although the partition walls are neglected in the design of buildings in general, it is known that they contribute the stiffness of the buildings. The recent Turkish Earthquake Code accounts the effect of partition walls to check inter-storey strength irregularity. In the formula of the effective shear area, calculated for the direction of earthquake and storey basis, whole effective shear area of the columns and shear walls are accounted while 15% of the effective shear are of the partition walls are accounted (DBYYHY, 2007). This assumption and other important effects of partition walls will be discussed over the numerical models.       

 

In the literature, there is abundant number of study related to partition walls. However no other similar study like the proposed one (on the real building, under real conditions and with absolutely reliable methodologies) has been encountered. The coordinator of the proposed project has been participated in the vibration survey study of Beylerbeyi Palace and manages a small budgeted project supported by the university he is working. In that respect he has the required experience and willing to improve his career in this direction. The researcher, Dr. Seyit Çeribaşı is a professional on ground induced damage of reinforced concrete buildings and structural vibrations and he will contribute to the project.  

 

Keywords: partition walls, vibration analyses, dynamic behaviour, real building tests, reinforced concrete buildings