Betonarme Bir Elemanda Eğrilik Sünekliğinin İncelenmesi

Yıl 2010, Cilt: 6 Sayı: 2, 141 - 154, 01.06.2010

Semih Kiracı R. Tuğrul Erdem Muhiddin Bağcı

Öz

-

Anahtar Kelimeler

-

BETONARME BİR ELEMANDA EGRİLİK SÜNEKLİLİĞİNİN İNCELENMESİ- EVALUATION of CURVATURE DUCTILITY on a REINFORCED CONCRETE MEMBEREVALUATION of CURVATURE DUCTILITY on a REINFORCED CONCRETE MEMBER

Öz

BETONARME BİR ELEMANDA EGRİLİK SÜNEKLİLİĞİNİN İNCELENMESİ

Bu çalısmada, betonarme bir elemanın egrilik sünekligi ve sünekligi etkileyen faktörlerin arastırılması
amaçlanmıstır. Bu sebeple sargılı ve sargısız beton modelleri literatürdeki çalısmalardan alınarak ayrı ayrı
incelenmistir. Ayrıca sargı etkisini etkileyen faktörler de dikkate alınmıstır. Betonarme kesitlerdeki sünekligi
incelemek üzere SEMAp programından yararlanılmıstır. SEMAp programında 51 adet numunenin, degisik
parametreler etkisinde, moment-egrilik diyagramlarından yararlanarak süneklik degerleri hesaplanmıstır.
Elde edilen sonuçlar yardımıyla, SAS programından yararlanarak bir süneklik denklemi elde edilmistir.
Örneklerde yapılan degisikliklerin süneklige etkileri sonuç bölümünde ayrıntılı olarak verilmistir. Ayrıca
yapılan kontroller sonucunda elde edilen denklemin kullanılabilir oldugu ortaya çıkmıstır.
Anahtar sözcükler: Moment-egrilik, Sargılı ve sargısız beton modelleri, Süneklik, Süneklik denklemi

EVALUATION of CURVATURE DUCTILITY on a REINFORCED CONCRETE MEMBER

In this study, investigation of curvature ductility of a reinforced concrete member and the factors
which effect the ductility are purposed. Therefore, confined and unconfined concrete models are taken from
studies in the literature and analysed one by one. Furthermore, the factors that effect the confinement
behavior are also taken into consideration. An analysis program named SEMAp is used to investigate the
ductility on reinforced concrete sections. Ductility values of 51 different specimen which are under the sway
of different parameters are calculated by using moment-curvature diagrams by SEMAp analysis program. A
new equation has been improved by using SAS statistic program with the help of the obtained results. At the
last part of the study, effects of different parameters on ductility, are given with details. Moreover, it is
detected that, the equation which is obtained after several verifications, gives acceptable results.

 

Anahtar Kelimeler

Moment-eğrilik, Sargılı ve sargısız beton modelleri, Süneklik, Süneklik denklemi

Kaynakça

• [1] Hognestad, E., “A Study of Combined Bending and Axial Load in Reinforced Concrete Members”, Bulletin 399, University of Illinios Engineering Experiment Station, Urbana, (1951). Pp:128.
• [2] Mander, JB, Priestley, M.J.N and Park, R., “Observed Stress-Strain Behaviour of Confined Concrete, Journal of Structural Engineering”, ASCE, Vol. 114, No. 8:1827-49, (1988).
• [3] Mander, JB, Priestley, M.J.N and Park, R., “Theoretical Stress-Strain Model for Confined Concrete”, J. Struct. Div., ASCE, 114(8), 1804- 1825, (1988).
• [4] Mander, JB, “Seismic Design of Bridge Piers”, PhD Thesis, University of Canterbury, New Zealand, (1984).
• [5] McGraw Publishing Co., Considere, A., “Experimental Researches on Reinforced Concrete”, New York, (1903). Pp:188.
• [6] Richart, F.E., Brandtzaeg, A. and Brown A.L., “A Study of Failure of Concrete under Combined Compression Stresses”, University of Illinois Engineering Experimental Station, Bulletin 185, (1928). Pp:104.
• [7] Aktan, A.E., Karlsson, B.A. and Sozen, M.A., “Stress-Strain Relationship of Reinforced Concrete Bars Subjected to Large Strain Reversals”, Civil Engineering Studies, Structural Research Series, No 397, University of İllinois, (1973).
• [8] Bertero, V.V and Felippa, C., “Discussion of Ductility of Concrete”, Proceedings of International Symposium on the Flexural Mechanics of Reinforced Concrete, ASCE-ACI, Miami, 227-234, (1964).
• [9] Bing, L., R. Park, and H. Tanaka, “StressStrain Behavior of High-Strength Concrete Confined by Ultra-High- and Normal-Strength Transverse Reinforcements”, ACI Structural Journal, Vol. 98, No. 3, 395-406, (2001).
• [10] Ersoy U., Özcebe G. “Betonarme Gözden Geçirilmiş II. Baskı”, Evrim Yayınevi (2001).
• [11] Sheikh, SA and Uzumeri, SM, “Strength and Ductility of Tied Concrete Columns”, Journal of Structural Engineering, ASCE, Vol. 106, No. ST5, pp. 1079-102, (1980).
• [12] Kent, D.C. and Park, R., “Cyclic Load Behaviour of Reinforcing Steel, Strain”, 9(3), 98- 103, (1973).