| The truss structure is composed of many bars connecting with each other by nodes following some certain rules. This structure which has a homogeneous stress distribution is three dimension forced. And characteristics are occupied by this structure, such as reasonable-loaded, light-weighted, etc. This structure is not only economical but also have high integral rigidity and excellent seismic behavior. What's more, as the most spread structure of long-span roof, it is applied broadly all over the world.In this paper a nonlinear finite element analysis is made on an engineering example of truss structure. And tracking the whole process of the deformation that produced by the truss structure in order to find out the function and characteristics of the truss structure.Using ANSYS which is a common software, makes a double nonlinear analysis of material and geometry on this structure. Building the model based on different influencing factors which involve the member material, the wire table shaping, the restraint form as well as these three factors different combination. Analysis is made on the member stress, the model deformation and the P—Δcurves of node as well in order to find out the effects caused by different factors to the ultimate supporting capacity more exactly.This paper concludes some common problems existing in truss structure through summarizing the detecting conditions of around 400 awning of Petro-China gas stations in Hunan province and studys the disaster-causing mechanism of truss structure under the condition of ice-snow disaster, putting forward emergence measures to process truss structure in ice-snow disaster. |
