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(中國(guó)建筑科學(xué)研究院建筑結(jié)構(gòu)研究所，北京 100013)

［摘要］在一些受較大向上風(fēng)載的屋架或連接不同單體建筑步行橋的兩側(cè)桁架等結(jié)構(gòu)中，由于受到使用條件限制而無(wú)法為受壓弦桿設(shè)置平面外的支撐系統(tǒng)，因此這些結(jié)構(gòu)中受壓弦桿在平面外的穩(wěn)定問(wèn)題就顯得格外突出。闡述了這類穩(wěn)定問(wèn)題的力學(xué)機(jī)制，歸納和討論了在桁架結(jié)構(gòu)中無(wú)支撐受壓弦桿出平面穩(wěn)定問(wèn)題的理論分析方法及結(jié)果，通過(guò)算例驗(yàn)證了數(shù)值方法的有效性，并通過(guò)數(shù)值方法分析了弦桿的軸力變化對(duì)面外計(jì)算長(zhǎng)度的影響，隨后對(duì)北京當(dāng)代MOMA工程連接周邊建筑與電影院屋頂之間步行橋桁架中的相關(guān)問(wèn)題進(jìn)行了分析，最后給出了對(duì)于實(shí)際工程問(wèn)題的分析方法和設(shè)計(jì)建議。

［關(guān)鍵詞］彈性支撐；受壓弦桿；面外計(jì)算長(zhǎng)度

Discuss on outplane effective length of compressive chord members in truss without lateral supports

Shang Xiaojiang, Xiao Congzhen, Zhang Liruo

(Institute of Building Structures, China Academy of Building Research, Beijing 100013, China)

Abstract:In some truss structures, such as the roof truss undergoing heavy upward wind load, or the truss on both sides of a footbridge connecting different buildings, the service conditions do not allow us to place lateral support for the compressive chord members. In these structures, the out-plane stability problem of the compressive chord members becomes very significant. The mechanism of such stability problem is explained, the related theoretical method is summarized and discussed, the validity of numerical analysis is verified, and the effect of varied axial force on the effective length is analyzed through numerical examples. Then the relevant problem in the footbridge to the cinema roof of Beijing Grand MOMA is analyzed, and at last the design methods and suggestions are provided.

Keywords:flexural lateral support; compressive chord member; out-plane effective length

作者簡(jiǎn)介：尚曉江，博士研究生。Email:shj-cas@sina.com。