马  福，  秦奇峰，  闫  园
   （太原理工大学建筑与土木工程学院，太原 030024）

[摘要] 桁架是一种常见的结构形式，其受力特征也为工程师们所熟知。但是，把它应用于转换结构当中时，它的受力特征与单纯的桁架是有区别的。在工程中常用的转换桁架有三种形式，即空腹桁架、斜腹杆桁架和混合桁架。三种转换桁架的区别主要是腹杆布置形式的不同，所以，就有必要对腹杆在转换桁架中的作用进行研究。利用有限元软件ANSYS对三种不同形式的转换桁架结构在弹性阶段的受力状态进行分析，通过三种转换桁架形式的对比分析得出了这样的结论：斜腹杆的增设使得桁架各杆件的内力分布更加的均匀合理，刚度和整体性提高，有效地改善转换桁架的变形性能。为转换桁架在工程实际中的应用提供参考或者建议。
[关键词] 钢筋混凝土；转换桁架；有限元；受力性能
中图分类号：TU375.3    文献标识码：A    文章编号：1002-848X(2012) Sl-0770-06

Analysis on the mechanical behaviors of reinforced concrete conversions trusses in different forms
Ma Fu, Qin Qifeng, Yan Yuan
( College of Architecture and Civil Engineering of Taiyuan University of Technology, Taiyuan 030024, China)

Abstract: The truss is a common structure, whose mecharucal characteristics are known for the engineers. However, its mechanical characteristics are different from a simple truss when it applied to convert the structure. Conversion truss commonly used in engineering has three forms:open-web truss, inclined abdomen bar truss and nuxed truss. The main differences between them are the different forms of abdominallever arrangement, so it is necessary to study the role of the ventral pole in conversion truss. Three forms of conversion truss structure were analyszed in the elastic stage by ANSYS, a finite element software. Some concludes are summarized through the comparative analysis: Add inclined braces make the distribution of intemal force in each member of the truss more uniform and reasonable, improve the stiffness and integrity of conversion truss, effectively improve the deformation performance of conversion truss, aiming to provide some references and suggestions for the application of conversion truss in projects.
Keywords: reinforced concrete; conversion truss; finite element; mechanical characteristics