Analysis of interactions among tank elements of multi-function concrete platform under prestresses

In order to exploit oil resources in the Bo Sea and other shallow seas of China, a platform made of steel and light weight high strength concrete with a tank and five steel\|columns is designed. At the present time, the concrete platform has never been constructed in China. This kind of platform has some advantages, such as multi\|function (extraction, storage), mobility, shallow draft and low manufacturing cost; it can also be reused. Because of its complex structure, interactions among platform elements will occur when prestresses are exerted on them and these actions can′t be analyzed distinctly by using ordinary methods. In this paper prestresses are exerted on the structure step by step. Through separating the elements of the platform, and combining several of them, then analyzing them individually, the interactions are clarified. This paper provides guiding suggestions for the arrangement of the prestressed reinforcement and the construction of the concrete platform.