doi:10.3850/978-981-08-9247-0_rp065-icsas11

ABSTRACT

Analysis of thermo-mechanical coupling effect is moving from single member towards global structures. Based on non-linear finite element analysis method, a series of global grid structure models (i.e. regular pyramidal grid structures, two-way orthogonal space trusses, diagonal square pyramidal space trusses and orthogonal extracted pyramidal space trusses) typically used in space grid systems were developed for analysis of the global structural response exposed to localized fires, and the non-linear finite element program, ANSYS, has been used throughout. Grid structural behaviors at elevated temperature take into account the temperature distribution, support location and loading ratio. The research shows that in localized fire the cooler parts can provide restraints for thermal elongation within heated area, and produce thermal stress among members of grid structure. The critical temperature, at which the grid structure collapsed, decreases with the more non-uniform temperature distribution in localized fire, and increases while the loading ratios decrease. Release the restraints along the main force transmission route for grid structures, which are induced by supports, can improve the structure fire-resistant performance significantly. Based on the above behaviors of grid structures under variety boundary conditions, the key coefficients method will be developed to obtain the design rules of space grid structures for the fire limit state.

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