FraMCoS 7 2010 Jeju, South Korea

Coupled damage and creep behavior of concrete under sustained loading

The coupled damage and creep behavior of concrete under sustained loading is investigated in this paper. Based on existed experimental results, a model explaining the relationship of nonlinear creep strains and damage of concrete is presented, together with the physical…

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Year 2010
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Abstract

The coupled damage and creep behavior of concrete under sustained loading is investigated in this paper. Based on existed experimental results, a model explaining the relationship of nonlinear creep strains and damage of concrete is presented, together with the physical mechanism and failure criterion of concrete creep failure under sustained loading. The model assumes that total strain of concrete under sus- tained loading consists of linear creep strain, nonlinear creep strain and damage strain, which is mainly caused by microcrack evolution. By comparing behavior of concrete under fatigue and sustained loading, the crack growth rate under sustained loading is assumed in proportion to the normalized strength intensity factor. Concrete damage and creep under sustained loading is analyzed with the proposed model. The comparison between the results by the model and those by experiments indicates a good agreement.