FIRE DESIGN OF STEEL MEMBERS - Civil and Natural Resources ...

8 CONCLUSIONS AND RECOMMENDATIONS:
8.1 UNPROTECTED STEEL MEMBERS:
The temperature of unprotected steel members with time can be estimated using a
variety of methods as shown in Section 4. The results of this section show that:
1. The equations recommended by ECCS (1985) provide a better timetemperature
relationship that the equations found presently in NZS 3404;
2. The temperature limitations of the equations recommended by ECCS (1985)
can be extended to 800 °C, and linear interpolation applied for temperatures
below 400 °C to increase the use of these equations;
3. The lumped mass time step methods give accurate results when the calculated
temperatures are compared to finite element computer models;
4. When evaluating the behaviour of a member exposed to fire on three sides, the
maximum temperature in the web and lower flange is the same as with four
sided protection
8.2 PROTECTED STEEL MEMBERS:
The results of analyses of protected steel members in Section 5 show that:
1. The ECCS (1985) equations give a good estimation of the time temperature
relationship for protected steel when compared to the spreadsheet method and
SAFIR.
2. The temperature limitations of the equations recommended by ECCS (1985)
can be extended to 800 °C, and linear interpolation used for temperatures
below 400 °C.
3. The lumped mass time step method gives temperatures that are close to those
found from SAFIR simulations.
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