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http://dx.doi.org/10.12652/Ksce.2015.35.4.0769

Rheological Models for Simulations of Concrete Under High-Speed Load  

Hwang, Young Kwang (Yonsei University)
Lim, Yun Mook (Yonsei University)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.35, no.4, 2015 , pp. 769-777 More about this Journal
Abstract
In this study, the rheological models were introduced and developed to reflect rate dependent tensile behaviour of concrete. In general, mechanical properties(e.g. strength, elasticity, and fracture energy) of concrete are increased under high loading rates. The strength of concrete shows high rate dependency among its mechanical properties, and the tensile strength has higher rate dependency than the compressional strength. To simulate the rate dependency of concrete, original spring set of RBSN(Rigid-Body- Spring-Network) model was adjusted with viscous and friction units(e.g. dashpot and Coulomb friction component). Three types of models( 1) visco-elastic, 2) visco-plastic, and 3) visco-elasto- plastic damage models) are considered, and the constitutive relationships for the models are derived. For validation purpose, direct tensile test were simulated, and characteristics of the three different rheological models were compared with experimental stress-strain responses. Simulation result of the developed visco-elasto-plastic damage(VEPD) model demonstrated well describing and fitting with experimental results.
Keywords
Rheological model; Rate dependency; Direct tension test; Strain rate;
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