Abstract
Some methods regarding stress calculation etc. of a caisson have to be updated because they follow the former conventional ones. In this study, improvement of the structural design method to a caisson was examined on the following two points.(1) Reduction in the span length of wall and slab.(2) Effect of filling sand in a caisson chamber on bending moment induced in a wall.As a result, essential data to rationalize of structural design methods were obtained. The main findings were summarized as follows:(1) The span length of wall and slab could be reduced, because fixed supporting points existed in the haunch region.(2) Due to resistance of filling sand, bending moment of a side wall became smaller than that without filling sand when loads were applied to the wall.Moreover, diagonal pull-off tests were carried out on hooks for suspension of a caisson. The equation of design shear capacity of concrete around the hooks for suspension was reviewed, and a modified equation was proposed based on the test results.
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