What is it about?
Buckled reinforcing bars exhibit bending strains across the bar section after strong earthquakes. The bending strain threshold that triggers brittle bar fracture in tension, referred to as the critical bending strain, can be obtained with the buckled bar tension (BBT) test. However, the BBT test requires three-dimensional (3-D) position measurement systems that are not widely available. To make the BBT test more accessible a set of empirical equations for curvature, neutral axis depth, and bending strains in buckled reinforcement are proposed.
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Why is it important?
The calculation of bending strains in buckled steel reinforcement permits to evaluate the onset of a type of structural collapse due to strong earthquakes.
Perspectives
The equations proposed in this paper are a complement to the BBT test developed at NC State University. These empirical equations permit to estimate the bending strains in buckled reinforcing bars to evaluate the critical bending strain that produces brittle bar fracture. The critical bending strain is a material chacarteristic which may indicate the onset of tension control failure of reinforced concrete structural members during strong earthquakes.
DIEGO SOSA
Escuela Politecnica Nacional
Read the Original
This page is a summary of: Simplification of Buckled Bar Tension Test through Fiber Modeling, ACI Materials Journal, May 2022, American Concrete Institute,
DOI: 10.14359/51734616.
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