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（浙江大學建筑工程學院， 杭州 310058）

［摘要］關于風吸力作用下C形和Z形簡支檁條穩(wěn)定承載力的計算，歐洲規(guī)范（Eurocode 3）和我國《門式剛架輕型房屋鋼結構技術規(guī)程》（CECS 102∶2002）都取其受壓下翼緣作為彈性地基上的壓桿來求解臨界荷載。然而，該方法的計算值與已有試驗值相比過于保守。由檁條繞固定軸扭轉屈曲的總勢能可求得風吸力作用下C形和Z形檁條的彈性臨界彎矩，計算其正則化長細比，然后采用修正的歐洲鋼結構協(xié)會（ECCS）鋼梁整體屈曲的穩(wěn)定系數(shù)公式，計算檁條的彈塑性穩(wěn)定系數(shù)，從而求得檁條的穩(wěn)定承載力。對比結果表明，此方法的計算值與試驗值更吻合。

［關鍵詞］風吸力； 檁條； 臨界荷載

中圖分類號：TU392.5     文獻標識碼：A     文章編號：1002-848X(2015)06-0080-06

Capacity of purlins for torsional buckling about fixed axis under wind uplift

load and comparison with tests

Feng Yixiao， Tong Genshu， Zhang Lei

 (School of Architecture and Civil Engineering, Zhejiang University, Hangzhou 310058, China)

Abstract:To calculate critical loads of Cshaped and Zshaped purlins under wind uplift load,  their lower flanges are simplified as  struts on elastic foundation  in both Eurocode 3 and Technical specification for steed structure of lightweight building with gabled frames（CECS 102∶2002）. But this method is  proved to be overconservative compared with test results in previous studies. The elastic critical moments of Cshaped and Zshaped purlins under wind uplift load, derived from total potential energy of torsional instability about fixed axis, were used to compute the normalized slenderness. The elastic\|plastic stability factor  of the purlin was determined by using a modified European Convention for Constructional Steelwork (ECCS) formula of global buckling stability factor of steel beam, thus critical loads of purlins can be obtained. The predicted results are compared well with available test results, showing a better agreement.

Keywords:wind uplift load; purlin; critical load

*國家自然科學基金項目(51478421)。

作者簡介：馮一笑，博士研究生，Email：fengyx91@gmail.com。

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