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    巢  斯¹，  白強(qiáng)強(qiáng)²
    （1 同濟(jì)大學(xué)建筑設(shè)計(jì)研究院，上海200092；2 同濟(jì)大學(xué)，上海200092）

[摘要] 通常水塔、球罐等建筑結(jié)構(gòu)的基礎(chǔ)剛度一般都很大，基礎(chǔ)底部各處地基變形差別很小，因此本文假定環(huán)形基礎(chǔ)以及地基模型均為彈性體，且認(rèn)為地基反力沿基礎(chǔ)梁環(huán)向均勻分布。繼而簡(jiǎn)化并建立了力學(xué)模型，并根據(jù)虛功原理對(duì)環(huán)形基礎(chǔ)進(jìn)行內(nèi)力分析，給出了環(huán)形基礎(chǔ)彎矩、扭矩以及剪力的一般表達(dá)式，作為一般工程的環(huán)形基礎(chǔ)梁的初步設(shè)計(jì)及校核使用，具有足夠的精度。
[關(guān)鍵詞] 環(huán)形基礎(chǔ)；地基反力；虛功原理；微分方程
中圖分類號(hào)：TU322    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：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