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Size effects in concrete and RC structures - diagonal shear and bending
Based on the crack propagation criteria, it has been discussed that the size effect in concrete and reinforced concrete structures depends on the structure geometry. Generally, from the linear elastic fracture mechanics (LEFM) point of view there are two typs of geometries: geometries which exhibit stable crack growth before the ultimate load is reached and geometries for which the ultimate load coincide with crack initiation. The first type of geometries indicates a strong size effect in a broad size range. Contrary to that the second type exhibite the size effect on the nominal strength only in the limited size range. Consequently, there is no general size effect law, however, with respect to the size effect, it may be useful to classify concrete and reinforced concrete RC structures in the two above mentioned classes. It has been shown that the size effect is one of the most important phenomena in concrete in RC structures. Namely, variation of material and geometrical properties has different meaning at different structural sizes. Therefore, all parameters relevant for the structural behaviour such as ductility (rotational capacity), minimum reinforcement, distributed reinforcement etc., have only a relative meaning i.e. they are all size dependent.
Size effects in concrete and RC structures - diagonal shear and bending
Based on the crack propagation criteria, it has been discussed that the size effect in concrete and reinforced concrete structures depends on the structure geometry. Generally, from the linear elastic fracture mechanics (LEFM) point of view there are two typs of geometries: geometries which exhibit stable crack growth before the ultimate load is reached and geometries for which the ultimate load coincide with crack initiation. The first type of geometries indicates a strong size effect in a broad size range. Contrary to that the second type exhibite the size effect on the nominal strength only in the limited size range. Consequently, there is no general size effect law, however, with respect to the size effect, it may be useful to classify concrete and reinforced concrete RC structures in the two above mentioned classes. It has been shown that the size effect is one of the most important phenomena in concrete in RC structures. Namely, variation of material and geometrical properties has different meaning at different structural sizes. Therefore, all parameters relevant for the structural behaviour such as ductility (rotational capacity), minimum reinforcement, distributed reinforcement etc., have only a relative meaning i.e. they are all size dependent.
Size effects in concrete and RC structures - diagonal shear and bending
Ozbolt, J. (author) / Eligehausen, R. (author)
1997
43 Seiten, 34 Bilder, 44 Quellen
Report
English
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