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   馬  福，  秦奇峰，  閆  園
   （太原理工大學(xué)建筑與土木工程學(xué)院，太原 030024）

[摘要] 桁架是一種常見(jiàn)的結(jié)構(gòu)形式，其受力特征也為工程師們所熟知。但是，把它應(yīng)用于轉(zhuǎn)換結(jié)構(gòu)當(dāng)中時(shí)，它的受力特征與單純的桁架是有區(qū)別的。在工程中常用的轉(zhuǎn)換桁架有三種形式，即空腹桁架、斜腹桿桁架和混合桁架。三種轉(zhuǎn)換桁架的區(qū)別主要是腹桿布置形式的不同，所以，就有必要對(duì)腹桿在轉(zhuǎn)換桁架中的作用進(jìn)行研究。利用有限元軟件ANSYS對(duì)三種不同形式的轉(zhuǎn)換桁架結(jié)構(gòu)在彈性階段的受力狀態(tài)進(jìn)行分析，通過(guò)三種轉(zhuǎn)換桁架形式的對(duì)比分析得出了這樣的結(jié)論：斜腹桿的增設(shè)使得桁架各桿件的內(nèi)力分布更加的均勻合理，剛度和整體性提高，有效地改善轉(zhuǎn)換桁架的變形性能。為轉(zhuǎn)換桁架在工程實(shí)際中的應(yīng)用提供參考或者建議。
[關(guān)鍵詞] 鋼筋混凝土；轉(zhuǎn)換桁架；有限元；受力性能
中圖分類號(hào)：TU375.3    文獻(xiàn)標(biāo)識(shí)碼：A    文章編號(hào)：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