巢  斯¹，  白强强²
    （1 同济大学建筑设计研究院，上海200092；2 同济大学，上海200092）

[摘要] 通常水塔、球罐等建筑结构的基础刚度一般都很大，基础底部各处地基变形差别很小，因此本文假定环形基础以及地基模型均为弹性体，且认为地基反力沿基础梁环向均匀分布。继而简化并建立了力学模型，并根据虚功原理对环形基础进行内力分析，给出了环形基础弯矩、扭矩以及剪力的一般表达式，作为一般工程的环形基础梁的初步设计及校核使用，具有足够的精度。
[关键词] 环形基础；地基反力；虚功原理；微分方程
中图分类号：TU322    文献标识码：A  文章编号：1002-848X(2011) S2-0392-03

    Internal forces analysis of ring foundation based on the virtual work principle
    Chao Si¹, Bai Qiangqiang²
    (1 Architectural Design & Research Institute of Tongji University, Shanghai 200092, China; 2 Tongji University, Shanghai 200092, China)

Abstract: Usually the structure foundation stiffness is generally large, such as towers, spherical buildings, so the ground deformation difference around the bottom of foundation is very small. It is assumed that both the ring foundation and ground model are elasticity, and the ground reaction force is uniformly distributed along the foundation beam. Then a mechanical model was simplified and established, and the force of the ring foundation was analyzed based on the vutual work principle. So the general expressions of ring foundation bending moment, shear and torque were given. It is sufficiently accurate to design preliminarily and check the ring foundation of the general project.
Keywords: ring foundation; ground reaction force; virtual work principle; differential equations