蒋利学
(上海市建筑科学研究院，上海200032)

[摘要] 本文研究竖向荷载作用下现浇梁板协同工作性能对主次梁楼盖中主框架梁内力的影响。分析结果表明，完全弹性分析且梁翼缘宽度取全宽（即梁间距）时，主框架梁支座与跨中截面基本处于纯弯曲状态，而其截面弯矩可近似用仅考虑单向受力的杆系单元模型计算；当翼缘宽度减小时，梁支座截面和跨中截面分别处于偏心受压和偏心受拉状态。翼缘有效宽度内主框架梁的弯矩可用传统杆系单元模型估算。
[关键词] 竖向荷载；现浇主次梁楼盖；协同工作；有限元分析；有效翼缘宽度

    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