Deniz GÜNEY, M. Hasan BODUROĞLU

Deprem etkisi altındaki simetrik ve asimetrik yapıların, lineer olmayan tepkilerine dolgu duvarlarının katkısı

Tasarım aşamasında, dolgu duvarların rijitliklerinin yapı davranışına katkısı dikkate alınmamaktadır. Ancak bu elemanların sahip oldukları rijitliğin, yapıların gerek simetrik gerekse asimetrik plana sahip olması durumunda, deprem etkisi altında, yapı davranışını etkilemesi beklenmelidir. Burulma tepkisi beklenmeyen simetrik planlı yapılarda, duvar etkisi ile burulma tepkisi ortaya çıkabilmektedir. Bu etkileri inceleyebilmek için seçilen simetrik ve asimetrik yapı modelleri hesaplanarak, farklı deprem etkileri altında tepkileri yorumlanmıştır. Taşıyıcı elemanlar ve duvarlar, malzeme bakımından lineer olmayan şekilde modellenmiştir. Yazılan programda “Durum Uzayı” yöntemiyle sayısal integrasyon yapılarak, yapı dinamik tepki karakteristikleri elde edilmiş, bulunan verilerin karşılaştırılmasına dayanarak duvarların, yapıların dinamik ötelenme ve burulma tepkisine yaptığı katkılar gösterilmiştir.

Effect of infill walls to the nonlinear torsional behavior of symmetric and asymmetric structures under earthquake effect

Generally during the design procedure, the stiffness of infill wall is not taken into account. However, these walls have an initial stiffness which causes torsional and translational response even the structure is symmetric under earthquake effect. If the structure is asymmetric, these walls change torsional response of structures. In order to investigate this effect, different structural models are designed with and without infill walls. The nonlinear behavior of both infill walls and structure should be taken into account as nonlinear force-displacement relation. Six different earthquake records which have different characteristics are applied to both asymmetric and symmetric structures as earthquake excitations then the response of structures are calculated in time history domain. In order to prevent stability problems in time history domain, the time interval was changed from 0.02 sec to 0.005 sec by using linear interpolation functions. The basis of program which is used to calculate structural response characteristics is using State Space Method in order to calculate dynamic response characteristics of structures under earthquake motions. According to results, the effects of infill walls to the dynamic response characteristics of symmetric and asymmetric structures are interpreted.

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Bertero, R. D., (1995). Inelastic torsion for preliminary seismic design, Journal of Structural Engineering (ASCE), 121, 8, 1183-1189.
Erdik, M. O., (1975). Torsional effects in dynamically excited structures, Ph.D Thesis, Department of Civil Engineering, Rice University, Houston, Texas, USA.
Fardis, M. N., Bousias, G., Franchioni, G., Panagiotakos, B., (1999). Seismic response and design of RC structures with plan-eccentric masonary infills, Earthquake Engineering and Structural Dynamics, 28, 173-191.
Gluck, J., Reinhorn, A. M., Rutenberg, A., (1979). Dynamic torsional coupling in tall building structures, Proc. Institution of Civil Engineers, Pt. 2, 411-424.
Güney, D., Boduroglu, M. H., Aydın, E., (2004). Dolgu duvarların simetrik ve asimetrik yapıların lineer olmayan davranışlarına etkisi, ACE 2004, 6th International Congress on Advances in Civil Engineering, 6-8 October 2004, Istanbul, Turkey, 374-384.
Housner, G. W., Outinen, H., (1958). The effect of torsional oscillations on earthquake stres, Bull. Seismological Society of America, 221-229.
Madan, A., Reinhorn, A. M., (1997). Modeling of masonry infill panels for structural analysis, Journal of Structural Engineering (ASCE), 123, 1295-1302.
Kan, C. L., Chopra, A. K., (1981). Torsional coupling and earthquake response of simple elastic and inelastic systems, Journal of Structural Engineering (ASCE), 107, 1569-1588.
Rossenbueth, E., (1957). Consideretaions on torsion, overturning and drift limitations, Proc. SEAOC Conference, Cornado, Mexico, 36-38.
Rossenbueth, E., (1960). Aseismic provisions for the federal district, Mexico. Proc. 2nd World Conference Earthquake Engineering, Tokyo, Japan, 2009-2026.
Rutenberg, A., Pekau, O. A., (1983). Earthquake response of asymmetric buildings: a parametric study, Proc. 4th Canadian Conference Earthquake Engineering, Vancouver, Canada, 271-281.
Wood, S., Stark, R. ve Creer, S., (1991). Collapse of eight-story rc building during 1985 Chile Earthquake, Journal of Structural Engineering (ASCE), 117, 600-619.