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Title: Minimum reinforcement for bending: theory, experiments and comparison with recommendations

Author(s): Ruiz López, G.; Planas Rosselló, J.; Elices Calafat, M.

Publication: ACHE

Volume: 48

Issue: 206

Appears on pages(s): 25-Sep



Date: 1/8/1997

Minimum reinforcement in building codes in usually calculated in agreement with limit state theories (plasticity), whose results are not size dependent. Nevertheless, lightly reinforced beams show size effect: maximum load grows slower than beam depth in proportional beams, reinforcement ratio and steel characteristics remaining constant. Concrete fracture mechanics catches this size effect: this paper presents a new reinforcement ratio formula, based on fracture mechanics, obtained through a model and an experimental program. This expression is also compared with building codes and another authors formulae. This comparison shows the convenience of revising Spanish EH-91 in this subject, because its minimum reinforcement recommendations do not depend on the beam size and seem to be too conservative.

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