ÇELİK LİF KATKILI VE KATKISIZ BETONARME KİRİŞLERİN BASİT EĞİLME VE PATLAMA YÜKLEMESİ İLE DAVRANIŞLARININ İNCELENMESİ

Year 2006, Volume: 22 Issue: 1, 112 - 120, 01.02.2006

Fatih Altun Canan Yılmaz Adem Durmuş Kamuran Arı

Abstract

Bu çalışmada, Dramix RC-80/0.60-BN tipi çelik lif katkılı C30 sınıfı silindir beton numuneler; 0 kg/m3 , 30 kg/m3 , 60 kg/m3 dozajlarında her gruptan 6 adet olmak üzere toplam 18 adet üretilmiş ve çelik lif katkısının, betonun mekanik özeliklerine olan etkileri incelenmiştir. Çalışmanın ikinci aşamasında, 0 kg/m3 , 30 kg/m3 , 60 kg/m3 dozajlarında çelik lif katılarak 300x300x2000 mm boyutlarında toplam 9 adet betonarme kiriş üretilmiştir. Betonarme kirişlerde basit eğilme oluşacak şekilde deney yapılarak çelik lif katkısının betonarme kiriş mekanik özeliklerine olan etkileri araştırılmıştır. Üçüncü aşamada ise, ikinci aşamadaki özeliklerde her grup için ikişer adet olmak üzere toplam altı adet betonarme kiriş üretilmiştir. Bu kirişlerde patlama yüklemesi ile deneyler yapılmıştır. Çalışma sonucunda; katkısız ve değişik dozajlarda çelik lif katkılı beton silindir numunelerin ve betonarme kirişlerin genel mekanik özelikleri belirlenerek, patlama yüklemesi etkilerinin çelik lif katkısı ile betonarme kirişlerdeki değişimi verilmiştir.

Keywords

Beton, Çelik lif, Patlama, Tokluk.

INVESTIGATION OF REINFORCED CONCRETE AND STEEL-FIBER REINFORCED CONCRETE BEAMS UNDER SIMPLE BENDING SUBJECTED TO BLAST LOADING

Abstract

In the first phase of this experimental study, the mechanical properties of steel-fiber concrete are measured on 150x300 mm cylindrical samples taken out of fresh batches of C30 class of concrete having steel fiber dosages of 0 kg/m3 , 30 kg/m3 , 60 kg/m3 , 6 samples for every batch, respectively. Next, a total of nine reinforced concrete (RC) beams of 300x300x2000 mm dimensions are produced using C30 class of concrete with steel fiber dosages of 0 kg/m3 , 30 kg/m3 , 60 kg/m3 , three beams having the same steel fiber dosage, respectively. In the second phase of the study, all of these nine beams are subjected to a simple bending experiment until ultimate failure and their flexural behaviours are recorded. Next, a total of six beams, two pertaining to these three different steel fiber dosages, are produced. In the third phase of the study, all of these six beams are subjected to blast loading by detonating explosive of proportional amounts attached at mid-span section of each beam. The resultant conditions of the beams from three different groups are observed and their reactions to the blast loads are presented in a comparative way in relation to their initial mechanical behaviours against simple bending. Hence, the effects of steel fiber dosages of RC beams on blast-loading resistance is reported.

Keywords

Concrete, Steel fiber, Explosion, Toughness

References

• Ocean Concrete Products, Ocean Heidelberg Cement Group, Steel Fibre Reinforcement, Working Together to Build Our Communities Report, 1999, USA.
• Dupont, D., Vandewalle, L., Bending Capacity of Steel Fibre Reinforced Concrete (SFRC) Beams, International Congress on Challenges of Concrete Construction, Dundee, pp. 81-90, 2002.
• Ganesan, N., Shivananda, K. P., Spacing and Width of Cracks in Polymer Modified Steel Fibre Reinforced Concrete Flexural Members, International Congress on Challenges of Concrete Construction, Dundee, pp. 244- , 2002.
• Alavizadeh-Farhang, A., Plain and Steel Fibre Reinforced Concrete Beams Subjected to Combined Mechanical and Thermal Loading, Thesis, Department of Structural Engineering, Royal Institute of Technology, Bulletin No. , Stockholm, Sweden, 1998.
• Hartman, T., Steel Fiber Reinforced Concrete, Thesis, Department of Structural Engineering, Royal Institute of Technology, Stockholm, Sweden, 1999.
• Abolhassan A. A., Casey H., Qiuhong Z., Analysis of Car-Bomb Effects on Buildings using MSC-Dytran Software and Protective Measures, Proceedings of The MSC Software Virtual Product Development Conference, Dearborn, Michigan,pp. 1-10, October 13-15, 2003
• Corley W. G., Applicability of Seismic Design in Mitigating Progressive Collapse, Construction Technology Laboratories Report, Inc., Skokie, Illinois, Nist workshop, 2002.
• Vandenberghe M., B. Zwevegem., Steelfibres for the Construction of military shelters, IV. International Dramix Conference, Belgien, November 7-8, 1990.
• RILEM TC162-TDF, Test and design methods for steel fibre reinforced concrete: Bending test, Materials and structures, 2000, Vol. 33, January-February, p 3-5.
• RILEM TC162-TDF, Test and design methods for steel fibre reinforced concrete: σ-ε design method, Materials and structures, 2000, Vol. 33, March, p 75-81.
• ASTM C1018-92, Standart Test Method for Flexural Toughness and First-Crack Strength of Fibre-Reinforced
• Concrete , American Society for Testing and Materials, May 7p., 1992