單層房屋鋼支撐體系的內(nèi)力和桿件計算
陳紹蕃
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(西安建筑科技大學(xué)土木工程學(xué)院710055)［提要］單層房屋鋼支撐體系的設(shè)計，長期以來只考慮風(fēng)力和吊車制動力。實際上支撐桿件因被撐構(gòu)件的幾何缺陷而承受支撐力，十字交叉斜撐又因被撐構(gòu)件的壓縮變形而產(chǎn)生附加壓力。指出這兩種內(nèi)力不應(yīng)被忽視，并給出了有關(guān)計算公式。對設(shè)計中如何計算屋架上弦橫向支撐和柱間支撐提出了建議，指出吊車梁下的交叉支撐不應(yīng)作為拉桿看待。［關(guān)鍵詞］單層房屋 鋼支撐體系 支撐力 附加壓力 十字交叉斜撐Internal Forces and Member Calculation in Steel Bracing System of Single Storey Buildings/Chen Shaofan (School of Civil Engineering,Xi"an University of Architecture & Technology,Xi"an 710055,China)Abstract:Since a long period,only wind load and longitudinal braking force are taken into account in the design of steel bracing system of single storey buildings. Actually,bracing members are subject to bracing force owing to the geometric imperfection of braced members. Furthermore,subordinate compression occurs in cross diagonal braces owing to the compressive deformation of braced members. It reveals that these two kinds of internal force must not be neglected and gives relevant calculation formulas. Suggestions are made regarding the calculation of truss upper-chord transverse bracings and inter-column bracing,indicating that cross bracings underneath crane girders should not be treated as tension members.Keywords:single storey building; steel bracing system; bracing force; subordinate compression; cross diagonal bracing
