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。
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.
研究结果表明：相干效应对主梁纵向弯矩影响比较大，尤其是中跨部位；而局部场地效应相对影响较小。
The results indicate that the vertical bending moment of girders, especially the girders of middle span, are influenced more obviously by coherence effect than by local site effect.
剪力键主要承受弯矩和剪力，从支座到跨中，其弯矩和剪力逐渐减小。
The shear keys bear moment and shear and decrease from support to mid-span.
剪力键主要承受弯矩和剪力，从支座到跨中，其弯矩和剪力逐渐减小。
The shear keys bear moment and shear and decrease from support to mid-span.
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