ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Load-Deformation Relationship of High-Strength Reinforced Concrete Beams

Author(s): S. Otani S. Nagai, and H. Aoyama

Publication: Symposium Paper

Volume: 162

Issue:

Appears on pages(s): 35-52

Keywords: beams (supports); cracking (fracturing); deformation; high-strength concretes; modulus of elasticity; reinforced concrete; yield strength; Structural Research

DOI: 10.14359/1422

Date: 8/1/1996

Abstract:
Force-deformation relationship of high-strength reinforced concrete beam members observed in the laboratory test was idealized by a trilinear relation for use in a nonlinear earthquake response analysis. Methods to evaluate the relationship were examined and the reliability of the methods were discussed with respect to the observed relations. Calculated initial stiffness is shown to significantly underestimate the observed value; a large coefficient of variation was attributed to accidental and shrinkage cracking in the specimen prior to the test. A similar large coefficient of variation was observed in the evaluation of cracking moment. Yield and ultimate moments could be favorably estimated by the theory. An empirical formula was proposed to evaluate yield deformation. An importance of controlling the elastic modulus of concrete in construction is emphasized if a structure is expected to behave as designed during an earthquake.