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- Title
Bearing Strength of Confined Concrete.
- Authors
Bonetti, Rodolfo; Roberts-Wollmann, Carin L.; Santos, Juan T.
- Abstract
An investigation has been performed on the influence of confining reinforcement on the bearing strength of concrete blocks. Square prisms 8 in. (203 mm) wide and 16 in. (406 mm) tall were reinforced with ties, spirals, and a combination of spirals and ties. The volumetric reinforcing ratio ρv varied from 0 to approximately 10%. Concrete strengths ranged between 2700 and 6230 psi (18.6 and 42.9 MPa). Specimens were loaded with steel plates and the ratio of supporting area to bearing area was kept constant at 4. Strain measurements were made of the reinforcement to confirm steel yielding and at the surface of the concrete blocks to record first cracking load. Analysis of the test data shows that the first cracking load is independent of the reinforcing ratio and is accurately predicted by an equation based on the Mohr failure criterion. Data also indicate that ultimate strength increases linearly with the confining pressure up to a volumetric reinforcement ratio of 10%. Test results from previous investigations were also compared to proposed equations.
- Subjects
CONCRETE blocks; STRENGTH of building materials; IRON &; steel plates; CONCRETE construction; CONCRETE research
- Publication
ACI Structural Journal, 2014, Vol 111, Issue 6, p1317
- ISSN
0889-3241
- Publication type
Article
- DOI
10.14359/51687163