（1 上海建桥学院，201319；2 同济大学建筑设计研究院 上海 200092）

［提要］在考虑地下室基础承台刚域及抗拔桩布置的情况下，对基础梁的弯矩计算进行分析推导，得出了跨中弯矩的折减系数计算公式。通过实际工程的算例分析，采用简化计算得出四桩至六桩承台不同跨度、不同桩径的折减系数，从中可以看出，考虑承台和桩的作用能够降低基础梁高度及减少配筋，做到设计上的经济合理，从而节约了工程造价。

［关键词］基础梁；承台；刚域；承载力

Analysis on Foundation Beams Considering Rigid Zone of Pile Caps/Zou Xuan1, Jiang Wenhui2, Chao Si2(1 Jianqiao College, Shanghai 201319, China; 2 Arch. Design & Research Institute of Tongji University, Shanghai 200092, China)

Abstract:Moments on basement foundation beams considering rigid zone of pile caps and pulling resistance of piles are analyzed. Reduction factor of midspan moment is gained. A practical project is cited and a reduction factor table about various beam spans and pile diameters of 4 pile to 6 pile caps is listed to show that considering the action of pile caps can reduce beam depth and reinforcement, thereby saving construction cost.

Keywords:foundation beam； pile cap； rigid zone； bearing capacity