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（1 浙江大學(xué)建筑設(shè)計(jì)研究院，杭州 310027； 2 浙江方遠(yuǎn)建設(shè)集團(tuán)有限公司，杭州 318000； 3 浙江大學(xué)建筑工程學(xué)院，杭州 310027）

［摘要］采用混合型三層空腹鋼桁架作為某連體的主要承力結(jié)構(gòu)，整體建模分析了其靜力、動(dòng)力特性，指出支座節(jié)間加設(shè)斜腹桿可以大大提高空腹桁架的豎向剛度。三層空腹桁架的整體彎矩轉(zhuǎn)化成為上下弦桿的軸向力，而中間層弦桿處于中和軸位置，僅承受本層的局部彎矩作用。動(dòng)力特性分析表明，混合型三層空腹桁架豎向振動(dòng)頻率大于3Hz，滿足舒適度的要求。工程處于6度抗震設(shè)防地區(qū)，地震作用對(duì)桁架構(gòu)件截面不起控制作用。

［關(guān)鍵詞］空腹桁架；連體結(jié)構(gòu)；豎向剛度；振動(dòng)頻率

Application of three-layer vierendeel trusses with partial diagonals in portal structure

Zhao Guoxing¹，Guan Haifeng²，Xiao Nan³，Gan Gang¹(1 Architectural Design and Research Institute of Zhejiang Univ.，Hangzhou 310027，China；2 Zhejiang Fangyuan Construction

Group Co.，Ltd.，Hangzhou 318000，China； 3 College of Civil Eng. and Arch.，Zhejiang Univ.，Hangzhou 310027，China)

Abstract:A three-layer vierendeel truss with partial diagonals, which were utilized as portal structure, had great vertical stiffness from the analysis results of global model. The global moment of vierendeel truss was transferred to the axial forces of upper and lower chords while the midlayer chord took on null axial force as neutral position. The results from dynamic analysis show that the flutter frequency of the vierendeel truss is bigger than 3Hz, which satisfies the requirements of relevant codes. Furthermore, the seismic impacts on the vierendeel structure utilized for portal structure are not mainly important for determining section of the members in 6 degree earthquake areas with results from response-spectrum method.

Keywords:vierendeel truss； portal structure； vertical stiffness； flutter frequency

作者簡(jiǎn)介：趙國(guó)興，高級(jí)工程師，Email:zhaogx65@163.com。

參考文獻(xiàn)

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