18. Ultimate Strength of Composite Steel-Concrete Structure of Sandwich System

概要

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Recently, various kinds of Arctic offshore structures have been constructed. In designing such structures, designers have to pay particular attention to how to overcome ice loads acting on the structures. The use of the composite steel-concrete structure of sandwich system appears to be viable solution for offshore structures in the Arctic. In this paper, theoretical and experimental studies were carried out to study elastic-plastic behavior and ultimate strength of composite steel-concrete structure of sandwich system where concrete was placed in between steel plates. The theoretical analysis was performed using the finite element method which was newly developed to incorporate nonlinear characteristics of concrete and interaction between steel and concrete. Experiments were carried out to study reserved ultimate strength of the composite structure which had been exposed to thermal cycles, i.e. recurrence of freezing and thawing of concrete. The following information was obtained through the investigation: 1) Newly developed computer program can accutsyr1y predict the elastic plastic behavior and ultimate strength of the composite structure, 2) Simplified method of analysis based upon the truss theory could predict the ultimate strength of the composite structure. 3) The freezing and thawing cycles did not give an appreciable adverse effect on the strength of the composite structure.
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