Kolon – Kiriş Birleşimlerinde Etriye Yerine Kancalı Çelik Fiberlerin Kullanımı

Öz

Depremlerde ortaya çıkan enerji yapısal elemanlar tarafından yutulmalıdır. Kolon kiriş birleşim bölgeleri ise bu durumda kırılmadan parçalanmadan ve yük taşıma kapasitesinde eksilme olmadan deprem kuvvetlerine karşı koymalıdır. Modern yapı şartnameleri kolon kiriş birleşim bölgesinde etriyelerin sıklaştırılması ve kesintisiz devam ettirilmesini öngörmektedir. Bu bölgeye etriye yerleştirilmesi oldukça zor ve zahmetli olmasından ötürü birçok binada etriyelerin birleşim bölgesinde devam ettirilmesi sağlanamamıştır. Bu çalışmada etriyeli, etriyesiz, hacimsel olarak %0.250, %0.375, %0.500 kancalı çelik fiber ihtiva eden beş adet 1/1 ölçekli kolon kiriş birleşimi numunesi tersinir tektarlanır yük altında test edilerek yük – deplasman grafikleri elde edilmiş ve etriye yerine kancalı çelik fiber kullanımının sonuçları irdelenmiştir.

Anahtar Kelimeler

• Kolon – Kiriş Birleşimi, Kancalı Fiber, Yük – Deplasman

USE OF HOOKED STEEL FIBERS INSTEAD OF STIRRUPS IN BEAM-COLUMN CONNECTIONS

Abstract

In an earthquake the energy should be dissipated by structural elements. The energy concentrated in beam-column connections. As a result of this, the concrete in the connection zone should not break, collapse and should stay stiff for no reduction in the load bearing capacity of connection. Because of this all codes forces design engineer and constructor to continue stirrups in beam or column without break in the connection. While application of reinforcement according to the design in construction stage , to put stirrups in connection is very hard and takes a lot of time also it is very hard to concrete this region also. This study concerns with the use of hooked steel fibers instead of stirrups in beam column connections. Recent studies made clear that, use of steel fibers increase ductility, stiffness and toughness in concrete. In this study 5 beam-column connections are tested under cyclic loading. First specimen has stirrups in connection zone according to code, the rest have no stirrups but have hooked steel fibers instead in connection zone with varying volumetric ratio 0,000%, 0,250%, 0,375%, 0,500%. The specimens are tested in Selcuk University Civil Engineering Department Structural Laboratory. Earthquake loads are simulated on the 1/1-scaled specimens and all vertical and horizontal displacements are taken by a dozen of LVDT and this data is sent and saved by the help of an electronic device and computer program. The experimental load – deflection capacities are found and compared.

Keywords

• Beam column connection, hooked, steel fibers, cyclic loading

Kaynakça

1. ACI Committee 544, 1973, State of The Art Report on Fiber Reinforced Concrete ,ACI Journal, November, 729-744.
2. Akın, S.K., 1999, The Effect of Fiber Concrete on Bearing Capacity of Beam Column Connection , Msc Thesis, Selcuk University.
3. Craig, R.J., 1984, Structural application fo reinforced fibrous concrete, Concrete Internatıonal, December, 28-32.
4. Kaltakcı, M.Y., Kamanlı, M., 1998, An experimental study on flexural behaviour of lightweight and normal weight concrete, PhD thesis, Selcuk University.
5. Soroushian, P., Bayasi, Z., 1991, Fiber type effects on the performance of steel fiber reinforced concrete, ACI Materials Journal, 88, 2, 129-134.