Research Progress on Fire Resistance Performance of Buckling Restrained Braces
DOI:
https://doi.org/10.54691/gek0jf68Keywords:
Buckling Constraint Support; Fire and High Temperature; Seismic Performance; Fireproof Coating; Thermo-mechanical Coupling.Abstract
Starting from the key influencing factors such as core material, size effect, thickness of fireproof coating, filler and filling gap, the research progress of Buckling-restrained Brace (BRB) fire resistance is systematically reviewed, and it is pointed out that optimizing the thermal expansion matching between the restraining member and the core material and using the coating with low thermal conductivity can significantly improve its high-temperature bearing capacity. Secondly, the failure mechanism of three types of BRB under fire is analyzed, and the applicability of the existing fire resistance limit calculation methods is compared and evaluated. Then, starting from the fire prevention measures, the advantages and disadvantages of intumescent fire retardant coatings, cladding composite fire retardants, aerogel composite coatings and other protection schemes were analyzed, and it was proposed that multi-functional composite coatings with both lightweight, high efficiency and durability were an important development direction for BRB fire protection in the future.
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