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Abstract

A finite element computer program is used to determine the temperature-deflection curve of a loadbearing steel beam throughout the entire heating-cooling duration. From this analysis, the residual deformation of the steel beam is determined. A simple method to calculate this residual deformation is then proposed. Results from this simple method are shown to be in broad agreement with predictions from the more rigorous finite element computer program.

The residual deformation of a steel beam may then be used to assess the potential damage caused by fire and to help establish an approach to calculate the structural fire protection for minimum post-fire repair. In this approach, an appropriate deflection limit is selected at which the steel beam is regarded as serviceable, thus requires no major repair. Fire protection is provided to the steel beam so that its residual deflection after a fire does not exceed this limit. An example is given to show how this simple method is applied.

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A Theoretical Investigation Into the Residual Deformation of Steel Beams After a Fire

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