Experimental Investigation of the Effects of Concrete Compressive Strength and Shear Reinforcement Ratio on the Behaviour of RC Beams Under Earthquake Load

Sercan Tuna Akkaya; Ömer Mercimek; Ozgur Anıl; Merve Nilay Karaca

Makale detayları

Experimental Investigation of the Effects of Concrete Compressive Strength and Shear Reinforcement Ratio on the Behaviour of RC Beams Under Earthquake Load

Yazarlar:

Sercan Tuna Akkaya | Ömer Mercimek | Ozgur Anıl | Merve Nilay Karaca

Yayıncı:

Kirikkale University

Ana Başlıklar:

Earthquake Engineering

Dergi:

International Journal of Engineering Research and Development Vol.16 Issue 2, pp.852-859

Belge Tipi:

Makale

Yayın Tarihi:

6/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001314843

pISSN:

1308-5506

Anahtar kelimeler:

Özet:

 Many errors are encountered during the design of reinforced concrete beams, and the most important of these design errors is the lack of shear reinforcement. Sudden and brittle shear failure in reinforced concrete beams, insufficient shear reinforcement ratios in the beams, shear reinforcement hooks not bending at the 135o angle required to fully perform the wrapping function, very high shear forces acting on short beams connected to shear walls or large size columns, and This occurs due to reasons such as second order effects arising from earthquake loads. After the Kahramanmaras earthquakes that occurred on February 6, 2023 in our country, many of the reinforced concrete beams suffered severe shear damage due to the above reasons. Within the scope of this study, concrete compressive strength and the distance between shear reinforcements were selected as variables. While beams with low and normal strength were used as concrete compressive strength, a total of 4 test elements were produced, with the distance between the shear reinforcements in the beams being determined as 75 and 200 mm. Cyclic earthquake load was applied to the test elements. The maximum bearing capacity, initial stiffness, displacement ductility ratios, energy dissipation capacities, collapse mechanisms, general load displacement behaviors resulting from the loading applied to the reinforced concrete beam test elements were obtained and the obtained results were interpreted. It was observed that the test elements with higher concrete compressive strength had higher maximum bearing capacity, initial stiffness, displacement ductility ratio and energy consumption capacity values. It has been determined that the yield strength and displacement at the yield point of the test elements with a greater distance between the shear reinforcement are lower. While shear failure, which is a sudden and brittle failure mode, occurred in the test elements with insufficient shear strength, a bending failure mode was observed in the test elements with sufficient shear strength.

 Many errors are encountered during the design of reinforced concrete beams, and the most important of these design errors is the lack of shear reinforcement. Sudden and brittle shear failure in reinforced concrete beams, insufficient shear reinforcement ratios in the beams, shear reinforcement hooks not bending at the 135o angle required to fully perform the wrapping function, very high shear forces acting on short beams connected to shear walls or large size columns, and This occurs due to reasons such as second order effects arising from earthquake loads. After the Kahramanmaras earthquakes that occurred on February 6, 2023 in our country, many of the reinforced concrete beams suffered severe shear damage due to the above reasons. Within the scope of this study, concrete compressive strength and the distance between shear reinforcements were selected as variables. While beams with low and normal strength were used as concrete compressive strength, a total of 4 test elements were produced, with the distance between the shear reinforcements in the beams being determined as 75 and 200 mm. Cyclic earthquake load was applied to the test elements. The maximum bearing capacity, initial stiffness, displacement ductility ratios, energy dissipation capacities, collapse mechanisms, general load displacement behaviors resulting from the loading applied to the reinforced concrete beam test elements were obtained and the obtained results were interpreted. It was observed that the test elements with higher concrete compressive strength had higher maximum bearing capacity, initial stiffness, displacement ductility ratio and energy consumption capacity values. It has been determined that the yield strength and displacement at the yield point of the test elements with a greater distance between the shear reinforcement are lower. While shear failure, which is a sudden and brittle failure mode, occurred in the test elements with insufficient shear strength, a bending failure mode was observed in the test elements with sufficient shear strength.

 Many errors are encountered during the design of reinforced concrete beams, and the most important of these design errors is the lack of shear reinforcement. Sudden and brittle shear failure in reinforced concrete beams, insufficient shear reinforcement ratios in the beams, shear reinforcement hooks not bending at the 135o angle required to fully perform the wrapping function, very high shear forces acting on short beams connected to shear walls or large size columns, and This occurs due to reasons such as second order effects arising from earthquake loads. After the Kahramanmaras earthquakes that occurred on February 6, 2023 in our country, many of the reinforced concrete beams suffered severe shear damage due to the above reasons. Within the scope of this study, concrete compressive strength and the distance between shear reinforcements were selected as variables. While beams with low and normal strength were used as concrete compressive strength, a total of 4 test elements were produced, with the distance between the shear reinforcements in the beams being determined as 75 and 200 mm. Cyclic earthquake load was applied to the test elements. The maximum bearing capacity, initial stiffness, displacement ductility ratios, energy dissipation capacities, collapse mechanisms, general load displacement behaviors resulting from the loading applied to the reinforced concrete beam test elements were obtained and the obtained results were interpreted. It was observed that the test elements with higher concrete compressive strength had higher maximum bearing capacity, initial stiffness, displacement ductility ratio and energy consumption capacity values. It has been determined that the yield strength and displacement at the yield point of the test elements with a greater distance between the shear reinforcement are lower. While shear failure, which is a sudden and brittle failure mode, occurred in the test elements with insufficient shear strength, a bending failure mode was observed in the test elements with sufficient shear strength.

 Betonarme kirişlerde tasarım esnasında birçok hata ile karşılaşılmakta olup bu tasarım hatalarının başında kesme donatısı eksikliği gelmektedir. Betonarme kirişlerde meydana gelen ani ve gevrek olarak gerçekleşen kesme kırılması, kirişlerdeki kesme donatısı oranlarının yetersiz olması, kesme donatılarının kancalarının sargılama görevini tam olarak gerçekleştirmesi için gerekli olan 135o açıyla bükülmemesi, perde veya büyük boyutlarda kolonlara bağlanan kısa kirişlere çok yüksek değerlerde kesme kuvveti etki etmesi ve deprem yükleri etkisiyle ortaya çıkan ikinci mertebe etkiler gibi nedenlerden dolayı gerçekleşmektedir. Ülkemizde 6 Şubat 2023 tarihinde meydana gelen Kahramanmaraş depremleri sonrasında betonarme kirişlerin birçoğunda yukarıdaki nedenlerden dolayı ağır kesme hasarları meydana gelmiştir. Bu çalışma kapsamında beton basınç dayanımı ve kesme donatıları arasındaki mesafe değişken olarak seçilmiştir. Beton basınç dayanımı olarak düşük ve normal dayanıma sahip kirişler kullanılırken kirişlerdeki kesme donatıları arasındaki mesafe 75 ve 200 mm belirlenen toplamda 4 adet deney elemanı üretilmiştir. Deney elemanlarına tersinir tekrarlanır deprem yüklemesi uygulanmıştır. Betonarme kiriş deney elemanlarına uygulanan yükleme sonucunda meydana gelen maksimum taşıma gücü, başlangıç rijitliği, deplasman süneklik oranları, enerji tüketim kapasiteleri, göçme mekanizmalar, genel yük deplasman davranışları elde edilmiş ve elde edilen sonuçlar yorumlanmıştır. Beton basınç dayanımı büyük olan deney elemanlarının daha yüksek maksimum taşıma kapasitesi, başlangıç rijitliği, deplasman süneklilik oranı ve enerji tüketim kapasitesi değerlerine sahip olduğu gözlenmiştir. Kesme donatısı arasındaki mesafe fazla olan deney elemanlarının akma dayanımı ve akma noktasındaki deplasman değerinin daha az olduğu tespit edilmiştir. Kesme dayanımı yetersiz olan deney elemanlarında ani ve gevrek göçme modu olan kesme göçmesi meydana gelirken kesme dayananımı yeterli olan deney elemanlarında eğilme göçme modu gözlenmiştir.

Makale detayları

Experimental Investigation of the Effects of Concrete Compressive Strength and Shear Reinforcement Ratio on the Behaviour of RC Beams Under Earthquake Load

Yazarlar:

Sercan Tuna Akkaya | Ömer Mercimek | Ozgur Anıl | Merve Nilay Karaca

Yayıncı:

Kirikkale University

Ana Başlıklar:

Earthquake Engineering

Dergi:

International Journal of Engineering Research and Development Vol.16 Issue 2, pp.852-859

Belge Tipi:

Makale

Yayın Tarihi:

6/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001314843

pISSN:

1308-5506

RC Beam

compressive strength

shear deficient

cyclic earthquake loadbetonarme kiriş

basınç dayanımı

kesme donatısı eksikliği

tersinir deprem yüklemesi

Sayı

Makale detayları

Yazarlar: Sercan Tuna Akkaya | Ömer Mercimek | Ozgur Anıl | Merve Nilay Karaca

Yayıncı: Kirikkale University

Ana Başlıklar: Earthquake Engineering

Dergi: International Journal of Engineering Research and Development Vol.16 Issue 2, pp.852-859

Belge Tipi: Makale

Yayın Tarihi: 6/2024

Belge Dili: Türkçe

Document ID (Org No.): 2001314843

pISSN: 1308-5506

Sayı

Yazarlar:

Sercan Tuna Akkaya | Ömer Mercimek | Ozgur Anıl | Merve Nilay Karaca

Yayıncı:

Kirikkale University

Ana Başlıklar:

Earthquake Engineering

Dergi:

International Journal of Engineering Research and Development Vol.16 Issue 2, pp.852-859

Belge Tipi:

Makale

Yayın Tarihi:

6/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001314843

pISSN:

1308-5506