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(中南林業(yè)科技大學(xué)土木工程與力學(xué)學(xué)院， 長沙 410004)

［摘要］鋼框架梁柱弱軸連接節(jié)點(diǎn)的力學(xué)性能具有明顯的半剛性連接特性。基于小變形疊加原理，將梁柱弱軸連接節(jié)點(diǎn)的轉(zhuǎn)角變形分解為彎矩作用引起的節(jié)點(diǎn)轉(zhuǎn)角和節(jié)點(diǎn)域剪切變形引起的轉(zhuǎn)角。采用虛功原理推導(dǎo)了梁柱弱軸連接節(jié)點(diǎn)在彎矩作用下的節(jié)點(diǎn)轉(zhuǎn)角計算公式。同時，采用彈性力學(xué)方法推導(dǎo)了該類節(jié)點(diǎn)的節(jié)點(diǎn)域剪切變形引起的轉(zhuǎn)角計算公式。通過節(jié)點(diǎn)的彎矩-轉(zhuǎn)角關(guān)系，求得該類節(jié)點(diǎn)的轉(zhuǎn)動剛度，并提出適合于結(jié)構(gòu)分析的節(jié)點(diǎn)力學(xué)分析模型。算例結(jié)果表明，梁柱弱軸連接節(jié)點(diǎn)的半剛性大大降低了結(jié)構(gòu)的抗側(cè)剛度，在實(shí)際工程設(shè)計中不容忽視。

［關(guān)鍵詞］鋼框架； 梁柱弱軸連接； 半剛性； 力學(xué)模型

中圖分類號：TU391文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2015)11-0009-04

Mechanical model study of beam-to-column minor axis connection of steel frame

Hu Xibing, Chen Da

(College of Civil Engineering and Mechanics, Central South University of Forestry

and Technology, Changsha 410004, China)

Abstract:The beam-to-column minor axis connection of steel frame structure has obvious performance of semi-rigid connection. Based on the small deformation superposition principle, the rotation deformation of beam-to-column minor axis connection can be divided into rotation caused by moment and rotation caused by shear deformation of node domain. The formula of rotation of the connection under moment action was deduced based on principle of virtual work. Meanwhile, the formula of rotation of the connection under shear deformation action of node domain was deduced based on the method of elastic mechanics. By the relation of moment-rotation, the rotational stiffness of the connection was obtained, and the connection mechanics analysis model suitable for the structure analysis was presented. The results of calculations show that the semi-rigid connection greatly reduces the lateral stiffness of the structure, which can not be ignored in design of practical engineering.

Keywords:steel frame; beam-to-column minor axis connection; semi-rigid; mechanical model

*湖南省住房和城鄉(xiāng)建設(shè)廳科技項目（200919）。

作者簡介：胡習(xí)兵，博士，副教授，Email: hxb_is_me@126.com。

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