American Society of Civil Engineers

Empirical Stress-Strain Model for Unconfined High-Strength Concrete under Uniaxial Compression

by Zhao-Hui Lu, (Associate Professor, School of Civil Engineering and Architecture, Central South Univ., 22 Shaoshannan Rd., Changsha 410075, China; formerly, JSPS Postdoctoral Research Fellow, Dept. of Architecture, Kanagawa Univ., 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan. E-mail: and Yan-Gang Zhao, (corresponding author), M.ASCE, (Professor, Dept. of Architecture and Building Engineering, Kanagawa Univ., 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan E-mail:

Journal of Materials in Civil Engineering, Vol. 22, No. 11, November 2010, pp. 1181-1186, (doi:

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Document type: Technical Note
Abstract: In this note, a number of empirical models available in the literature of the complete stress-strain curve for unconfined high-strength concrete under uniaxial compression are reviewed and investigated using the published experimental data. Based on the investigations, a new empirical model with emphasis on the softening branch is proposed to generate the complete stress-strain relationship for high-strength concrete. An application of the new empirical model to published experimental data on normal weight concretes over a wide strength range demonstrates that the present model gives a good representation of the mean behavior of the actual stress-strain response.

ASCE Subject Headings:
Stress strain relations
High-strength concrete

Author Keywords:
Stress-strain relations
High-strength concrete