导　　师： 闫月梅

学科专业： 081402

授予学位： 硕士

作　　者： ;

机构地区： 西安科技大学

摘　　要： 目前国内外对钢框架稳定性的研究大都通过框架柱的稳定性来间接保证钢框架的稳定性,对钢框架的空间整体稳定性能研究较少。然而实际的框架结构都是空间结构,本文从结构的整体稳定性能出发,考虑结构各组成构件的相互作用,研究空间钢框架在梁、板、柱三者相对刚度变化下的稳定性能,以更好地协调结构的稳定承载力,对于指导设计工作具有十分重要的现实意义。 本文考虑材料非线性和几何非线性,用ANSYS有限元软件对多层空间钢框架的稳定性能进行了模拟。通过对4个系列12个试件的计算与分析,主要研究了钢框架在荷载作用下的稳定承载力变化,框架梁、板、柱三者相对刚度以及楼板开洞对钢框架整体稳定性能的影响。分析结果表明:楼板厚度、楼板洞口布置、柱截面尺寸对钢框架结构的稳定承载力具有较大的影响;结构的稳定承载力是由柱截面大小决定的,梁和板的作用在于为柱提供可靠而强有力的约束,使柱的稳定承载力充分发挥;存在混凝土楼板开洞时,洞口对不规则平面布置钢框架的稳定承载力影响较大;在楼板开洞情况下可提高楼板厚度来克服由于楼板开洞造成的稳定承载力下降,并且应尽量避免在结构的角部开洞,降低定义平面不规则布置结构的开洞标准,各层楼板同时开洞时,开孔率限值应改为30/%。为保证结构的整体稳定性,本文提出了:多层钢框架结构中,采用规则平面布置形式时楼板厚度应保持在150mm以上,采用不规则平面布置时,如L形平面布置,混凝土楼板厚度应保持在200mm左右。 本文所建立的有限元模型考虑问题较为全面,精度较高。本文深入地分析了多层空间钢框架在不同构件刚度下的稳定性能,研究工作和得出的结论对于指导工程设计具有一定的参考价值,为进一步研究多层空间钢框架的整体稳定性能打下了良好� At present, both at home and abroad, the stability of steel frame is studied mostly by studying the stability of frame column to indirectly guarantee the stability of the steel frame, while the studies of overall stability of space steel frame are rare. Yet the practical structure of framework is space structure. This article begins with the overall stable performance of the structure, considering the interaction of components, a deep research on the stable performance of space steel frame in relative stiffness changes of beams, slabs, and column is done to better coordinate the stable bearing capacity of structure, which has very important practical significance to guiding the design work. Considering material nonlinearity and geometric nonlinearity, using ANSYS finite element method of nonlinear the stable performance of special steel frame is studied, and the real stress state of it in various circumstances is simulated. Through four series of 12 specimens of calculation and analysis, the article mainly studies the changes of stable bearing capacity of steel frame in plus load, and the effect of relative stiffness of beams, slabs, and column, and floorslab hole to overall stable performance. Analysis results show that the thickness of floorslab, the decoration of floorslab hole and column sectional dimension have a great influence on the stable bearing capacity of steel frame structures. Columns stiffness determines the maximum stable capacity of the framework, and the stiffness of the floorslab determines whether the structure can reach stable of bearing capacity. When the concrete floorslab hole exists, the hole has great influence on stable bearing capacity of irregular plane layout of framework. To guarantee the overall stability of structure, this paper puts forward that within the multi-storey steel frame, when regular plane layout is used, the thickness of floorslab shall remain above 150mm; when irregular plane layout is adopted, such as L layout, the thickness of concrete floor should keep aroun

关 键 词： 空间钢框架 非线性有限元 相对刚度 楼板开洞 稳定承载力

领　　域： [建筑科学]