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The Structural Response of Beam String Structure in Case of Fire in Different Areas of a Large Space Building |
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Abstract: In this paper, the structural response of the Beam String Structure (BSS) in case of fire in a large space building is investigated by using the finite element method. The fires at the side segment, the middle segment and the full span of the BSS are considered separately in order to reveal the impact of fire areas on the structural response. The horizontal displacement of the right support block and the vertical displacement of the beam are obtained, together with the axial forces of the string and strut. The results indicate that the right support block of the BSS exposed to fire would move toward right with the increase of the fire temperature gradually in a notable extent. It is recommended that some measures should be taken to limit the maximum horizontal displacement of the right support block for improving the safety of the structure. The non-uniform temperature caused by different fire exposures may greatly influence the displacement, bending moment and axial force of the structure. This should be considered in the fire resistant design for this structure. A fire protection design for the BSS based on the assumption of its full span being exposed to fire is relatively conservative. The real fire condition should be considered during the fire resistant design and extra protecting measures should be taken for the weaker members and segments based on the analysis on the structure response of the BSS under some local fire condition.
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Received: 21 December 2010
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Corresponding Authors:
Chang-Kun CHEN
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