Stress-Strain Curves for Unconfined and Confined Concrete Masonry


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Title: Stress-Strain Curves for Unconfined and Confined Concrete Masonry

Author(s): M. J. N. Priestley and D. M. Elder

Publication: Journal Proceedings

Volume: 80

Issue: 3

Appears on pages(s): 192-201

Keywords: compressive strength; concrete blocks; confined concrete; deformation;dynamic tests; earthquakes; masonry; reinforced masonry, stress-strain relationships;structural analysis.

Date: 5/1/1983

An experimental investigation of the compression stress-strain characteristics of grouted concrete masonry prisms is described. Variables included block width, longitudinal reinforcement within the grout flues, and presence of thin stainless steel confining plates within the mortar bed in an attempt to improve falling branch characteristics and ultimate compression strain. Testing was carried out at low strain rates, representative of conventional testing practice, and at high strain rates approximating those expected under seismic conditions. It is shown that confining plates were effective in modifying the failure mechanism and improving ductility of the stress-strain relationship and that high strain rates resulted in a small but significant increase in prism strength. Average curves obtained from the test program agreed well with a modified form of the Kent-Park curve for confined reinforced concrete prisms.