蔺建中  孙守荣  王  刚
(中国建筑西北设计研究院 西安 710003)

[提要]  运用有限元程序，对某大学活动中心结构的整体和局部构件受力性能、薄弱部位及影响因素、大跨度屋盖对主体结构受力性能影响等问题进行了模拟分析。结果表明，结构具有扭转不规则和承载力突变特性，薄弱部位出现在错层部位、转角部位和弱连接部位；空旷框架部分存在着相对变形大和两向内力差异大现象，P-△效应明显; 大跨度钢屋盖在水平力作用下对主体结构有不可忽视的影响。阐述了有关设计方法。
[关键词]  大开洞不规则结构 结构分析 受力性能 设计方法

Abstract:  For a thorough understanding of the overall and local structural behaviors of a university student sorts center, including weak parts and influence of large- span roof on the main structure, a finite element software are used to analyze the structure. The analysis result shows that the structure has torsion effect and the mutation of resistance ability. Weak parts appear in slit levels, corners and weak links. Opening part of the frameuork has relatively large deformation and big difference of the forces in two orthogonal directions. The P-△effect is obvious. Influence of large-span on the main structure under horizontal seismic effect is not negligible. The specifc design method is represented.
Keywords:  irregular structure with big openings; structural analysis; force behavior; design method