Date

2017

Document Type

Thesis

Degree

Master of Science

Department

Structural Engineering

First Adviser

Stephen Pessiki

Abstract

This report examines different fire protection measures to increase the fire resistance of circular hollow structural steel column sections while maintaining their appealing architectural appearance. The question of whether increasing size of the cross section can provide enough fire resistance to these members is asked. Also, the efficiency of adding intumescent paint, or filling the column with concrete on the fire resistance of the steel members is examined. Eighteen unprotected and fire protected circular structural hollow steel section models are analyzed with Abaqus software for heat transfer and strength calculations. Intumescent paint and concrete-filled column sections are studied among the fire protection methods that does not harm surface appearance of the structural steel members. These fire protection measures are then compared with the SFRM applied column models to evaluate their fire resistance efficiency. It was found that increasing size of the cross section in unprotected columns helps reduce the temperature of steel and delay the reduction in its strength during a fire. This can be used to increase fire resistance of unprotected steel columns when the required fire rating is below 30 minutes. Intumescent paint provided a good amount of fire resistance to the column when the fire exposure was not severe, because intumescent paint degrades at temperatures above 800 oC. For the concrete filled section, however, if the concrete is used only as heat sink, it was shown that it cannot provide considerable fire resistance. Lastly, of the fire protection methods studied, SFRM proved to be the most efficient fire protection method when the surface appearance of steel member is of no importance.

Share

COinS