プレストレスを導入した合成構造の乾燥収縮・クリープによる応力変化の研究

抄録

In response to the demands for the speed-up construction of marine structures, a new type of composite structure has been introduced by consisting of cylindrical precast concrete blocks, filled-in concrete and steel pipe pile. Since this composite structure is made of concrete and steel, the internal concrete stress by prestressing is anticipated to decrease where the drying shrinkage and creep of concrete are constrained by the steel. Therefore, the authors conducted the serial tests in order to clarify the stress changes of introduced prestress due to the drying shrinkage and creep by means of monitoring strains and carried out the mechanical tests for comparing the theoretical values. The results of this study show that the stress losses due to the drying shrinkage and creep could be taken by a certain empirical formula and that the stress state is this composite structure could be obtained by creep factor and strain of drying shrinkage stated in the Standard Specification for Design and Construction of Concrete Structures by JSCE.