Static And Dynamic Finite Element Analysis Of Benxi Stadium Steel Pipe Truss Structural Roof

Light steel structure is a structural form, which has a broad prospect for development. It has the merits of light weight, short construction period, big structural span and good economy and so on. ranging from residential to commercial, from a single plant to high-rise buildings, from a few meters cross to hundreds of meters across in application fields. In the light steel roof of girder structure, steel truss structure is increasingly recognized by the insiders and outsiders, and was widely popularized. Steel pipe truss structures have the features of beautiful shape, good stiffness, good stability and good economy. This structure is composed of steel pipes, whose section are triangular or diamond shape. Compared with the grid structure, steel pipe truss structure don't have the longitudinal bottom chord and welded spherical joints of grid structure, steel consumption is small and the overall flexural capacity increases. In the form of building structures, steel pipe truss structures have more advantages than grid structures.The research of this article related to the project of Benxi City Stadium roof, the roof structure is in the form of space steel pipe truss structure, which is composed of two vertical space truss curved beams and ten horizontal steel pipe trusses. The vertical and horizontal truss sections are rhombus and triangles respectively. Using the APDL language of FEA software ANSYS, modeling of the structure was established, and spectrum analysis, seismic response spectrum analysis and time history analysis were completed respectively. Since the earthquake occurred frequently, how to realize the seismic design of large span steel structure is particularly important, which also makes the analysis in this article important to practice and the conclusions can be used in engineering. Main works are as follows:(1) Finite element model was established, natural vibration frequency of steel pipe truss structure analysis algorithms and ANSYS modal analysis process were expounded. Through the natural vibration frequency analysis, the research found universal law of natural vibration frequency, and determined the factors affecting natural vibration frequency.(2) This paper described the step of finite element software ANSYS spectral analysis, and conducted seismic studies of the steel pipe truss roof using mode-superposition response spectrum method, and was in combination with its own weight to obtain roof force distribution.(3) This paper used two natural wave and an artificial wave to analysis nonlinear dynamic response of the structure by the time-history analysis method and at the same time, analyzed displacement-time response of the special parts, providing a reference for seismic design of large-span steel pipe truss structures.