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.
|Title of host publication||Proc. Int. Conf. HPHSC|
|Place of Publication||Perth|
|Publication status||Published - 1998|
|Event||International Conference on High Performance High Strength Concrete (HPHSC) - Perth, Australia|
Duration: 10 Aug 1998 → 12 Aug 1998
|Conference||International Conference on High Performance High Strength Concrete (HPHSC)|
|Period||10/08/1998 → 12/08/1998|