- 摘 要
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蔣利學(xué)
(上海市建筑科學(xué)研究院，上海200032)[摘要] 本文研究豎向荷載作用下現(xiàn)澆梁板協(xié)同工作性能對主次梁樓蓋中主框架梁內(nèi)力的影響。分析結(jié)果表明，完全彈性分析且梁翼緣寬度取全寬（即梁間距）時，主框架梁支座與跨中截面基本處于純彎曲狀態(tài)，而其截面彎矩可近似用僅考慮單向受力的桿系單元模型計算；當(dāng)翼緣寬度減小時，梁支座截面和跨中截面分別處于偏心受壓和偏心受拉狀態(tài)。翼緣有效寬度內(nèi)主框架梁的彎矩可用傳統(tǒng)桿系單元模型估算。
[關(guān)鍵詞] 豎向荷載；現(xiàn)澆主次梁樓蓋；協(xié)同工作；有限元分析；有效翼緣寬度Effect of Cast-in-situ Floors with Beam and Girder on Main Frame Beams
Jiang Lixue
( Shanghai Research Institute of Building Sciences, Shanghai 200032)Abstract: The influences of the interaction between cast-in-situ beam and slab on the internal force of main frame beams in the floors with beam and girder under vertical load are studied. The analysis results reveal that, if full-elastic analysis is used and the full width, which is equal to the distance between adjacent beams, is taken to be the flange width, both of the supported section and the midspan section of main frame beams are in pure bending and the bending moments can be approximately calculated with beam element model in which slabs are loaded only in single direction; when the flange width is reduced, the supported section and midspan section of the beams are in eccentric compression and eccentric tension separately. The bending moments of main frame beams within effective flange width can be evaluated with traditional beam element model.
Keywords: vertical load; cast-in-situ floor with beam and girder; interaction, FEM analysis; effective flange width
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