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Çelik Tel Örgülerin Betonarme Kirişlerin Kesme Davranışına Etkisi

Çelik tel örgülerin çimento hamuruyla birlikte uygulanması neticesinde meydana gelen ferro-çimento, mevcut betonarme yapı elemanlarının güçlendirilmesinde kullanılan bir yöntemdir. Bu çalışmada ise, çelik tel örgülerin kesme donatısı olarak kullanılmasının betonarme kirişlerin davranışlarına etkileri deneysel olarak araştırılmıştır. Bunun için 150*300*2000 mm ebatlarında ve farklı donatı düzenine sahip üç adet betonarme kiriş üretilerek dört nokta eğilme testine tabi tutulmuştur. Sonuçta, çelik tel örgülerin kirişin çatlama mekanizmasını iyileştirerek geniş çatlakları azaltıp kılcal çatlakları artırdığı görülmüştür. Ancak, kesme donatısı olarak yalnızca çelik tel örgü kullanımı çatlamış kirişte erken dayanım kaybına neden olmuştur. Kesme donatısı olarak etriyelere ilaveten çelik tel örgülerin kullanılması durumunda ise betonarme kirişlerin yük taşıma kapasiteleri, başlangıç rijitlikleri ve yerdeğiştirme süneklikleri önemli oranda artmıştır.

Anahtar Kelimeler:

Çelik tel örgü, Dört nokta eğilme deneyi, Betonarme kiriş

Effect of The Steel Wired Mesh On the Shear Behavior of RC Beams

Ferro-cement made of steel wired mesh and cement mortar is a method using for strengthening of existing reinforced concrete structures. In this study, the effects of the steel wired mesh on the shear behavior of reinforced concrete beams were investigated experimentally. For this purpose, three reinforced concrete beams having 150x300x2000 mm dimensions and different reinforcements were produced and subjected to four point bending tests. As a result, steel wired mesh improved the cracking mechanism of the beam by reducing the number of large cracks while increasing minor cracks. However, the use of steel wired mesh has caused early strength loss of the cracked beam. In the case of the usage of steel wired mesh in addition to the stirrups as shear reinforcement, the load bearing capacities, initial stiffness and displacement ductility of the reinforced concrete beams have significantly increased.

Keywords:

Steel wired mesh, Four point bending test, Reinforced concrete beam,

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