Fire Resisting Performance Analysis Of Single Layer Spherical Reticulated Shells

Latticed dome with its characteristics of beautiful shape and clear force are widely usedin the building of the structure. But latticed dome structure is construct by steel, due to steelperformance of fire resistance is poor, the latticed dome structure in the fire is very easy to bedestroyed, so on the latticed dome structure fire resistance research is indispensable. Latticeddome structure belongs to the span space structure, so it need to consider the role of non-uniform unsteady temperature field in the calculation of the fire resistance. The most effectiveway to calculate the temperature field is a calculated field model at the present stage, themodel convection field balance equation is solved, resulting in the method of calculation ofthe temperature distribution in the fire, this paper calculated as fire building roof at thelatticed dome structure temperature field inside the building fire simulation, based on the non-premixed combustion of field model changes. The calculated inhomogeneous the giventemperature field, combined with specific K8latticed dome and the use of non-linear finiteelement calculation the transient response of structural under fire, and plastic limit bearingcapacity of latticed dome analysis.Validated the Non-premixed combustion model can effectively calculation large spacebuilding internal fire; Analysis the latticed dome structure in the fire on temperature field andthe hot flue gas flow has a certain regularity, and along with the fire power and fire indifferent position are rule has very big difference, Through the transient response of thestructure analysis shows that the latticed dome structure in the fire process thermal expansionplayed a leading role; That latticed dome structure of elastic-plastic stability limit bearingcapacity with the fire temperature increase rapidly reduce conclusion.When the calculatedrespectively two kinds of steel constitutive model, the paper puts forward the whole elastic-plastic stability limit bearing capacity analysis of constitutive model for the results will alsohave a significant impact.