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（1 中建鋼構(gòu)有限公司， 深圳 518000； 2 清華大學(xué)土木工程系， 北京 100084）

［摘要］平面桁架拱是桁架拱的一種特殊形式，其平面內(nèi)具有桁架結(jié)構(gòu)的特點(diǎn)，而平面外則與實(shí)腹式拱相近。在實(shí)腹式拱穩(wěn)定研究的基礎(chǔ)上，對(duì)平面桁架拱的平面外穩(wěn)定性能進(jìn)行了研究。首先得到了平面桁架拱的彈性屈曲公式，其次采用有限元算例研究了壓彎平面桁架拱的受力機(jī)理，并提出的壓彎桁架拱彈性設(shè)計(jì)方法。研究成果將作為平面桁架拱的平面外穩(wěn)定設(shè)計(jì)的理論基礎(chǔ)。

［關(guān)鍵詞］平面桁架拱； 平面外穩(wěn)定； 彈性； 設(shè)計(jì)方法

中圖分類號(hào)： TU318 文獻(xiàn)標(biāo)識(shí)碼： A文章編號(hào)：  1002-848X(2016)S1-0523-05

Out-of-plane elastic stability and design method of planar truss arch

Zhao Siyuan1, Wang Hong1, Guo Yanlin2

（1 China Construction Steel Structure Corp., Ltd., Shenzhen 518000, China; 

2 Department of Civil Engineering, Tsinghua University, Beijing 100084, China）

Abstract: Planar truss arch is a special form of tubular truss arch which has been widely used in structure engineering. It has the same in plane mechanical characteristic as truss structures, while its out of plane characteristic is similar to solid-web arch. Based on the stability study of solid-web arch, the out of plane stability of plane truss arch was discussed. Firstly, the elastic buckling load was achieved, and then the mechanism of plane truss arch under compression-bending load was studied based on FEM examples, and the compression-bending related equation was proposed. The results may be used as the theoretical base of the out-of-plane inelastic design of planar truss arches

Keywords: planar truss arch; out of plane stability; elastic; design method

作者簡(jiǎn)介：趙思遠(yuǎn)，博士研究生，工程師，Email：zhaosy005@163.com。

*中國(guó)博士后科學(xué)基金項(xiàng)目（2015M582449）。