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Modelling of tension stiffening for normal and high strength concrete

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Authors:
  • Christiansen, Morten Bo ;
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    Department of Structural Engineering and Materials, Technical University of Denmark
  • Nielsen, Mogens Peter
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    Department of Structural Engineering and Materials, Technical University of Denmark
Abstract:
Accurate calculations of the stiffness of concrete members are rare. Only in the uncracked state and the fully cracked state, where the reinforcement is near yielding, the stiffness calculations are relatively easy. The difficulties are due to the fact that concrete between cracks may give a substantial contribution to the stiffness, a phenomenon which is generally referred to as tension stiffening. The present paper describes a new theory of tension stiffening. It is based on a simple physical model for pure tension, which works with three different stages of crack generation. In a simplified form the model is extended to apply to biaxial stress fields as well. To determine the biaxial stress field, the theorem of minimum complementary elastic energy is used. The theory has been compared with tests on rods, disks, and beams of both normal and high strength concrete, and very good results are obtained.Keywords: Reinforced concrete, tension stiffening, cracked state stiffness, energy methods, rods, beams, disks.
Type:
Conference paper
Language:
English
Published in:
Proc. Int. Conf. Hphsc, 1998, p. 325-340
Main Research Area:
Science/technology
Conference:
International Conference on High Performance High Strength Concrete (HPHSC), 1998
Publisher:
CURTIN University
Submission year:
1998
ID:
2389429162
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