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
Keywords:
DOI:
Date:
1/8/1997
Abstract:
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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