Applications of Theory to Practice in Scandinavia


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Title: Applications of Theory to Practice in Scandinavia

Author(s): R. Lenschow, S. 0. Olesen, and S. Sahlin

Publication: Special Publication

Volume: 72


Appears on pages(s): 17-48

Keywords: concrete construction; concrete shells; fatigue (materials); impact streng -- marine atmospheres; offshore structures; s forms); slipform construction; slabs th; lo hells ; cylindri ads (force structural cal s);

Date: 12/1/1981

The use of concrete structures in off shore installations offers a challenge to structural engi-neers. Due to lack of direct experience from comparab-le, earlier concrete structures, it has often been necessary to rely more heavily on knowledge of the basic properties of concrete under extreme conditions. The paper describes a few examples. Inclined slipforming of large concrete tower structures requires creep and shrinkage deformations within the first few days to be accurately estimated taking into account the effect of heat generation and age on the strength and stiffness properties of the concrete. Off shore structures are generally exposed to fatigue loading from waves. Wave load histograms from the North Sea are presented and the problems in estimating the fatigue damage to the concrete is described. The effect of concentrated impact loads on slabs and cylindrical shells is treated. FEM analysis as well as laboratory tests have been performed. Finally, the strength of concrete under high water pressure is discussed.