New Approach to Strain Rate Sensitivity of Concrete in Compression
Publication: Journal of Engineering Mechanics
Volume 125, Issue 12
Abstract
A constitutive law to model the strain-rate-dependent compression behavior of concrete is proposed. It is derived from a mechanical model, where inertia effects influence damage formation. To verify this model an experimental method based on the split Hopkinson bar (SHB) technique is described, one that considers the special properties of concrete specimens. Compressive stress waves with varying peak values and durations were realized using an extended SHB device. Dynamic stress-strain relations—which differ considerably from the corresponding static relations—are derived for the investigated load histories and are modeled with the proposed dynamic constitutive law. While a number of compression load histories are sustained by the specimens, others result in failure. So a dynamic failure criterion is established, connecting failure occurrence, peak stress, and the time to reach the peak stress.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 125 • Issue 12 • December 1999
Pages: 1403 - 1410
History
Received: Jan 14, 1998
Published online: Dec 1, 1999
Published in print: Dec 1999
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