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Experimental study on biaxial mechanical behavior of concrete suffered high temperature and constitutive model

Journal of Harbin Institute of Technology(New Series) 2008年第5期15卷 679-685页

作者：张众宋玉普覃丽坤 School of Architecture Engineering Shandong University of Technology State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology School of Architecture and Civil Engineering Dalian Nationalities University

Biaxial compression tests on plain concrete suffered high temperature ranging from 200 ℃ to 600 ℃ were carried out using the large-scale dynamic-static tri-axial concrete test system at the State Key Laboratory of Coastal and Offshore Engineering with designated stress ratios of 0, 0.25, 0.5, 0.75 and 1, respectively. The measured strength and strain were reported and the changes in both biaxial compressive failure envelopes and strains at peak stresses were analyzed. The regressive equation of initial elastic modulus in the biggest principal compressive stress direction was derived from test results. With the published results from previous biaxial tension-compression experiments, a three-parameter failure criterion has been proposed. A biaxial nonlinear elastic incremental constitutive model was developed for the compressive stress directions by using the equivalent uniaxial strain values deduced from test results. Analytical results obtained from the proposed biaxial constitutive model achieve good agreement with the experimental results.

关键词： high temperature biaxial compression initial elastic modulus failure envelope constitutive model

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