CRACKING DUE TO DRYING SHRINKAGE AND DRYING SHRINKAGE ANALYSIS BASED ON DIFFUSION THEORY

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  • 乾燥収縮ひずみにより変状が生じた構造物と拡散理論に基づく乾燥収縮解析

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 There are a few cases that cracks occurred on PC structures at their young ages. It is judged that cracks were caused by large drying shrinkage of concrete. Drying shrinkage strain develops with the loss of moisture. When drying shrinkage is assumed to be constant at any position of cross section, it is impossible to simulate the crack due to drying shrinkage strain. The reason is that internal stress in concrete is developed by the difference of drying shrinkage between inside and outside of concrete. In order to examine the influence of the internal stress, the moisture distribution in concrete is calculated according to the diffusion equation. The analysis in this study targets to the PC bridge in site. As a result, it will be shown that internal stress of the PC bridge can be simulated and that the effect of drying shrinkage on the crack of the PC bridge can be presumed.

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