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ABSTRACI' Composite sandwich walls of steel plates and concrete are considered to have possible applicability to main structures of nuclear power plants. This structure is fabricated by placing concrete between two steel plates with steel-studs, shear reinforcing bars and web plates in the wall in order to fasten the steel plates on both sides of the wall together and to connect the plates to concrete. It is considered that heat transfers from fue-exposed surface of the wall to unexposed surface through steel members which form heat-bridges in case of fire. To examine the heat transfer and temperature distribution in the walls with heat bridges, a heat transfer analysis was performed. Then, heating tests by using smallscale models were carried out. The results obtained showed that after two hours of heating up to close to 1 0 ° C (specified heating the temperature) on the fire-exposed wall surfaces, the maximum temperatures on the other side of the wall surfaces of 20cm thick specimens were about 100"C, which were much lower than the ignition temperature of wood, 2 6 0 c . The temperature within 75 % of the total cross sectional area of the walls did not exceed 400 c.

Heat Bridge Effect Of Composite Sandwich Walls Of Steel Plates And Concrete