Mechanical Properties Under High Temperature On Chinese Marine University Gymnasium

With the continuous improvement of the level of social economy, morerequirements have been put forward for the large-span spatial structure, requiringarchitectural model to be more and more diversified and multi-functional, this hasprovided rich development space for the large-span spatial structure. Compared with theplane structure, the spatial structure has advantages such as large structural rigidity,reasonable force, light weight and low steel quantity, and the performances of spacestructure are various, the appearances are beautiful, so it has abstract artistic expression.All of this provide an abstract artistic expression. Now, for the large-span spatialstructure whose modeling is complex, the hot issue of current research has been how toreduce the damage of fire and earthquake.In this paper, according to the roof structure of Chinese Marine Universitycomprehensive gymnasium, we has made analysis of the mechanical performance underhigh temperature through ANSYS called finite element software, the research work areas follows:(1)Summarize the characteristic of traditional fire protection of steel structuredesign method and design method of performance-based fire resistance, combining withthe mechanical properties of grid structure and grid under high temperature analysisresults，puts forward a new idea of engineering design method of performance-basedfire resistance to establish more tailored design scheme, more economical andreasonable of the grid.(2)This paper has analyzed the mechanical performance of grid structure afterincreasing local temperature by using ANSYS software and material non-linear finiteelement theory, The result has shown the next three points. First, the high temperaturestiffness softening can not make the bar of the structure reach yield and produceunrecoverable plastic deformation, show that the network frame stiffness is very big.Second, to grid, different regions can produce different influence in high temperature.To large, complex grid structure, it’s necessary to analyze the performance according todifferent regions. Last, in high temperature, the upper area, the upper left area and themiddle area of the grid structure can produce more negative influence, so it’s necessary to strengthen the measures of fire protection.