根据地基及基础的变形将导致柱底发生转动，柱底转动约束刚度的大小直接影响上部结构内力，阐述了4种计算柱底转动约束刚度的方法，并通过分析单层单跨门式刚架在肩部集中水平力作用下，柱底不同约束条件时的肩部弯矩变化规律，提出按柱底弹性转动约束和刚性约束的条件计算上部结构内力存在显著差异，工程设计中应予重视。%On the basis of that deformation of ground base and foundation will result in column bottom rotation and the sizes of column bottom rotational restraint stiffness directly impact the upper structural internal forces , four methods of calculating column bottom restraint stiffness were presented .Through analyzing the change rules for shoulder bending moment of monolayer single span gantry frame under the action of horizontal force in the shoulder and the different restraint conditions of column bottom , it is put forward that there were significant difference in calculating upper structural internal force according to the conditions of column bottom elastic rota -tional restraints and rigid constraints , and in engineering design more attention should be paid to .
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