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http://dx.doi.org/10.12652/Ksce.2014.34.2.0403

Effective Strength of 3-Dimensional Concrete Strut  

Yun, Young Mook (Kyungpook National University)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.34, no.2, 2014 , pp. 403-413 More about this Journal
Abstract
For the reliable design of the structural concrete by the strut-tie model approaches of current design codes, the effective strengths of concrete struts must be determined with sufficient accuracy. Many values and equations for the effective strengths have been suggested until now. As those are for the two-dimensional concrete struts, however, it is inappropriate to employ them in the strut-tie model designs of three-dimensional structural concretes. In this study, an approach, that determines the effective strengths of three-dimensional concrete struts consistently and accurately by reflecting the state of 3-dimensional stresses, the 3-dimensional failure criteria of concrete, the degree of cracks (or tensile strains of reinforcing bars crossing the struts), the strut's longitudinal length, the deviation angle between strut orientation and compressive principal stress flow, compressive strength of concrete, and the degree of concrete confinement by reinforcing bars, is proposed. To examine the validity of the proposed approach, the ultimate strength analyses of 115 reinforced concrete pile caps tested to failure by previous investigators were conducted by the ACI 318-11's strut-tie model approach with the existing and proposed effective strengths of concrete struts.
Keywords
Structural concrete; Strut-tie model; 3-Dimensional concrete strut; Effective strength; Pile cap;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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