Abstract
Models for the restrained expansion strains under two-way restraint conditions both with their advantages and disadvantages are presented. An implementation of the modified strains development model (MSDM) for the assessment of the two-way restrained expansion strains is proposed. The reliability of the proposed model for the two-way restraint conditions is confirmed by the experimental results based on the tests of the expansive concrete plane specimens with the mesh reinforcement in the mid-depth of the cross section. DOI: http://dx.doi.org/10.5755/j01.sace.20.3.19082
Highlights
The shrinkage strains become less apparent for the self-stressed elements under two-way restraint conditions
Design model for the numerical determination of the restrained strains and self-stresses at the expansive stage of the concrete should be done in favour of that which could adequately reproduce chemical, physical and mechanical processes during the self-stressing concrete expansion under various design and technological factors
ΔPx.mt – cumulative force induced by the restraint in the x-direction; Δlx.s – increment of restraint length in the x-direction caused by the concrete expansion; Δlx.mt – increment of restraint length in the x-direction caused by the cumulative force; Ac, Ec – parameters of concrete section; As, Es – parameters of restraint
Summary
Estimation of the Restrained Strains and Self-stresses under Two-way Restraint Conditions. As was shown in Semianiuk et al 2017, models for the estimation of the restrained strains and self-stresses in expansive concrete at early age are based on one of two basic concepts: conservation law of chemical energy or initial strain calculation. To design self-stressed concrete structures it’s necessary to take into account the initial stressstrain state caused by the concrete expansion under restraint conditions. The dependence of restrained strains from the reinforcement arrangement (uniaxial, biaxial, triaxial), stiffness characteristics of restraint, curing conditions is confirmed by numerous investigations of self-stressed elements (Litver and Petukhov 1984, Litver and Sabajeva 1984, Marchuk 2002, Mikhailov and Gershvald 1984, Mikhailov and Litver 1974,). It should be noticed that because of the features of the expansive concrete process under two-way restraint conditions the self-stressed concrete ob-
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