Brincker, Rune

Hansen, Lars Pilegaard

Henriksen, M. S.

Heshe, Gert

Jensen, Jens Kristian Jehrbo

Ulfkjær, J. P.

The European Structural Integrity Society-Technical Committee 9, has initiated a Round Robin on 'Scale Effects and Transitional Failure Phenomena of Reinforced Concrete Beams in Flexure'. In Denmark, Aalborg University is participating. The programme for Aalborg University involves an experimental programme where 120 reinforced concrete beams, 54 plain concrete beams and 324 concrete cylinders are tested. For the reinforced concrete beams four different parameters are varied. The slenderness is 6, 12 and 18, the beam depth is 100 mm, 200 mm and 400 mm giving nine different geometries, five reinforcement ratios between 0.14% and 1.57%, and the concrete has a compressive strength of approximately 60 MPa or 90 MPa. The beams are tested in threepoint bending in a servo controlled materials testing system specially designed for the wide range of geometries The casting of the beams is finished. The experiments are presently performed and will continue until the summer of 1995. At present only results for the beam type with the dimension 100 mm x 100 mm x 1200 mm of normal strength concrete for all the reinforcement ratios and for geometrically similar beams with the reinforcement ratio 1.57 % is available. The results are presented as non-dimensional ultimate bending moments and the rotational capacity. The results show that the ultimate non-dimensional bending moment is dependent on the reinforcement ratio, when the reinforcement ratio is small, and independent for larger reinforcement ratios and that the rotational capacity is dependent on the reinforcement ratio, specially increasing at low reinforcement ratios. For geometrically similar beams in different size scales the experiments show that the non-dimensional moment is decreasing with size and that the rotational capacity both increases and decreases with the size scale.The European Structural Integrity Society-Technical Committee 9, has initiated a Round Robin on 'Scale Effects and Transitional Failure Phenomena of Reinforced Concrete Beams in Flexure'. In Denmark, Aalborg University is participating. The programme for Aalborg University involves an experimental programme where 120 reinforced concrete beams, 54 plain concrete beams and 324 concrete cylinders are tested. For the reinforced concrete beams four different pararmeters are varied. The slenderness is 6, 12 and 18, the beam depth is 100 mm, 200 mm and 400 mm giving nine different geometries, five reinforcement ratios between 0.14% and 1.57%, and the concrete has a compressive strength of approximately 60 MPa or 90 MPa. The beams are tested in threepoint bending in a servo controlled materials testing system specially designed for the wide range of geometries The casting of the beams is finished. The experiments are presently performed and will continue until the summer of 1995. At present only results for the beam type with the dimension 100 mm x 100 mm x 1200 mm of normal strength concrete for all the reinforcement ratios and for geometrically similar beams with the reinforcement ratio 1.57 % is available. Theresults are presented as non-dimensional ultimate bending moments and the rotational capacity.The results show that the ultimate non-dimensional bending moment is dependent on the reinforcement ratio, when the reinforcement ratio is small, and independent for larger reinforcement ratios and that the rotational capacity is dependent on the reinforcement ratio, especially increasing at low reinforcement ratios. For geometrically similar beams in different size scales the experiments show that the non-dimensional moment is decreasing with size andthat the rotational capacity both increases and decreases with the size scale

Rotational Capacity of Reinforced Concrete Beams

http://vbn.aau.dk/files/204442939/Rotational_Capacity_of_Reinforced_Concrete_Beams.pdf

Rotational Capacity of Reinforced Concrete Beams

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