Development of Thermal Crack Width Control Methods of Massive Concrete and its Code Draft

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In this study, the development of code draft for controlling thermal crack width has been tried. To attain the aforementioned purposes, various representative estimation method proposed in the past have been investigated in terms of its accuracy by comparison with the field observed data as well as finite element analysis results as supplemental data though FEM results is not always equal to the field observation.At the same time, fracture energy of early age concrete has been obtained experimentally and used in FEM analysis. The examined method include (a) statistical method proposed by Ono or Urugi, (b)uni-axial approximation method proposed by Satoh or Yoshikawa, (c)extended compensation plane method, (d)simplified finite element method.From the comparison, the extended compensation plane method and the simplified finite element method were found to give good estimation to quite large range of structural forms. Hence, basing on those result, the practical calculation method which could be considered as the bases of code draft is proposed. In case of the extended compensation plane method, it consists of the definition of stress relief area and calculation method using compensation plane and in case of the simplified finite element method, it consists of desirable mesh size and proposal of double node crack development analysis.