Betonarme kirişlerin deneysel ve teorik burulma momenti değerlerinin karşılaştırılması

Betonarme kiriş elemanlarda etriye oranı, beton sınıfı ve beton tipinin burulma davranışının üzerinde etkisinin deneysel olarak incelenmesi be çalışmanın temelini oluşturmaktadır. Deneylerde beton basınç dayanımı 20 MPa ile 40 MPa, beton tipi geleneksel beton ile kendiliğinden yerleşen beton ve etriye aralığı 80 mm ve 100 mm çalışmanın ana parametreleri olarak belirlendi. 12 adet normal betonlu 8 adet kendiliğinden yerleşen betonlu 250x300x1500 mm boyutlarında kiriş numunesi hazırlandı. Burulma momentine maruz bırakılan kiriş numunelerinin burulma momenti kapasiteleri, bu değere karşılık gelen döneme açısı, kritik burulma momenti değerleri, bu değerlere karşılık gelen kritik dönme açıları, burulma çatlakları deneysel olarak ölçüldü. Elde edilen deneysel burulma momenti kapasitesi sonuçları elastik, plastik ve yanal eğilme teorileri ile karşılaştırıldı. Deneysel sonuçlara en yakın değerler yanal eğilme teorisinde elde edildi. Kiriş numunelerinin burulma momenti kapasitesi-dönme açısı grafikleri çizildi. Düşük etriye aralığının, yüksek dayanımlı betonun ve beton tipi olarak kendiliğinden yerleşen betonun burulma davranışı üzerinde olumlu bir etkiye sahip olduğu deneysel olarak bu çalışma kapsamında belirlendi. Deneysel kritik burulma momenti değerleri ilgili çalışmalardan elde edilen ampirik değerlerin karşılaştırılması yapıldı.

The comparison of the experimental and theoretical torsional moment results of reinforcement concrete beams

The experimental investigation effect on the torsional behavior of web spacing, concrete class and concrete type of reinforcement concrete beams constitute basis of this work. The compressive strength of concrete, 20 MPa and 40 MPa, the type of concrete, conventional concrete and self-compacting concrete, web spacing of 80 mm and 100 mm, was determined the main parameters of this work. 12 unit of conventional concrete beams and 8 unit of self-compacting concrete beams of 250x300x1500 mm was manufactured. The torsional moment capacities and corresponding rotation angle values, the critical torsional moment values and corresponding critical rotation angles, torsional cracks of the beam samples that subjected to the torsion was measured experimentally. The torsional moment capacity results that were measured experimentally were compared with the elastic, plastic and skew-bending theories. The most closed results were get to the skew-bending theory. The graphic of torsional moment capacity- unit rotational angles were plotted. The low web spacing, high concrete class and self-compacting concrete type that have a positive effect on the torsional behavior was determined experimentally in this study. Experimental critical torsion values were compared with empirical values obtained from related studies.

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