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为了获得安全、经济、可靠的桁架模型,避免重复设计,提高设计质量和效率,以青海油田分公司跨越桁架标准化设计项目为背景,研究小型跨越桁架结构的受力状态,主要针对构件选型、截面选型、节点相贯线、结构内力、变形、刚度等方面进行对比分析,并采用MIDAS/CIVIL大型有限元软件建立有限元模型,研究影响桁架结构内力的因素。研究表明:综合考虑桁架结构的应力、挠度、刚度变化趋势,可以得到“理想桁架”;对于以恒载为主控荷载的桁架结构,当不断加大桁架的宽度和高度时,结构自重不断增加,导致结构杆件应力、变形均增大,对结构受力不利,也不经济,因此,建议桁架设计时选择合理的外形尺寸,兼顾桁架结构的受力及经济性。
In order to obtain a safe, economical and reliable truss model, to avoid duplication of design, to improve the design quality and efficiency, with the Qinghai Oilfield Branch across the truss standardized design project as the background, the research on the stress state of the small-span truss structure mainly focuses on component selection, Section selection, intersection of nodes, internal forces of structure, deformation, stiffness and so on. The finite element model of MIDAS / CIVIL software was used to study the factors affecting the internal force of truss structure. The results show that: considering truss structure stress, deflection and stiffness change trend, “ideal truss” can be obtained; for truss structure with dead load as the main control load, when the width and height of truss are increased, Resulting in the structure of the bar stress, deformation are increased, the structure of the adverse and uneconomical, it is proposed to choose a reasonable truss design dimensions, taking into account the truss structure of the force and economy.