| The steel tubular truss is a typical spatial structure system, which is widely used in the actual projects since it has specific mechanics characteristic, and the research of its load performance becomes more important. A roof structure with steel tubular truss in one stadium is taken as a research object in this article, and some aspects of static and dynamic performance are covered. The main contents including:Firstly, load behaviors of this roof structure under different load combinations are calculated by ANSYS software, therefore, inner force distribution and point displacement are obtained, and then static performance is known.Secondly, in view of the fact that the rigidity of spatial truss with square steel tube has major characteristic, in order to make the structure more reasonable and economical, ANSYS parameter design language (APDL) has been used to carry out the optimized design. The minimum total mass of truss structure is considered as objective function, and strength, rigidity, stability of members and overall deformation of spatial truss are considered as restrain conditions, then load properties of spatial truss adopting original and optimal cross-sectional dimensions separately are compared. Based on the stability theory of compressive members, a direct calculation method for cross-section design of circular steel tubular members under axially compressive force is proposed.Thirdly, based on static analysis, stability and ultimate load-bearing capacity are analyzed by ANSYS software. Linear buckling, geometric nonlinear stability and elastic-plastic nonlinear stability have been investigated by allowing for the perfect and imperfect structures. The relation curves of load-displacement and ultimate load-bearing capacity of arch-truss are obtained, the influence of initial imperfection and arch-truss support rigidity are considered. The ultimate load-bearing capacity of spatial truss is also obtained, and the relation curves of nodal displacement-load are analyzed.Fourthly, the connections between arch-truss and spatial truss have been set to hinged support and fixed support separately, modal analysis for this roof structure is carried out, natural vibration frequency and modes are obtained, the principle of superposition is also used to analyze the seismic performance of this roof structure. The results indicated that, the frequency distribution is close, the participation of the higher-order vibration modes should be considered in seismic design course. The influence of the horizontal earthquake action (6 degrees) is relatively small, which does not play control role.Finally, all researches in this article are concluded, some favorable conclusions are obtained and some questions need to be solved in future are pointed out. |
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