Fire Engineering Design of the New "Reichsbrucke" in Vienna


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Title: Fire Engineering Design of the New "Reichsbrucke" in Vienna

Author(s): Ataman Haksever and Karl Kordina

Publication: Special Publication

Volume: 80


Appears on pages(s): 177-200

Keywords: box beams; bridge decks; bridges (structures); cracking (fracturing);fire resistance; fire tests; girder bridges; high temperatures; restraints; insulation; prestressed concrete; research; stiffness; subways; tunnels.

Date: 7/1/1983

This paper describes the evalution of the necessary fireprecaution measures for the inner surface of a box girder bridge used for subway traffic, where a considerable fire risk can occur. The study shows in a concise form the evaluation of the relevant amount of fire load caused by the train and gives a summarizing view of a heat balance calculation, which leads to non-steady tem-perature conditions inside the box girder bridge, depending on the fire load and ventilation conditions. Taking into account the decrease in stiffness caused by temperature and cracking, and their combination with the load effects under service conditions in transverse as well as in longitudinal direction, the thermal restraining effects are evaluated. In consequence of this study it was shown that the bridge girder can not resist a fire attack without severe damage, if no inside insulation to the box girder is applied.