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賀虎成，周  霞，王洪西，張湘冀
(總裝備部工程設(shè)計(jì)研究總院，北京100028)

[摘要] 上海佘山森林劇場(chǎng)網(wǎng)殼是跨度為92m.高27.8m的雙層橢球體網(wǎng)殼?；谟邢拊狝NSYS結(jié)構(gòu)分析程序，建立了網(wǎng)殼結(jié)構(gòu)的空間有限元模型，計(jì)算了網(wǎng)殼的靜力性能。系統(tǒng)分析了不對(duì)稱分布荷載作用下，網(wǎng)殼的特征值屈曲荷載和考慮初始缺陷、幾何非線性、幾何材料雙重非線性時(shí)網(wǎng)殼結(jié)構(gòu)的極限荷載。結(jié)果表明，幾何、材料雙重非線性、荷載的不對(duì)稱分布對(duì)該網(wǎng)殼結(jié)構(gòu)的極限承載力影響很大。為類似結(jié)構(gòu)的工程設(shè)計(jì)、計(jì)算提供參考。
[關(guān)鍵詞] 網(wǎng)殼；穩(wěn)定性分析；幾何非線性；材料非線性；初始缺陷；不對(duì)稱荷載

    Stability Analysis of Net Shell Structure for Shanghai Sheshan Forest Theater
    He Hucheng, Zhou Xia, Wang Hongxi, Zhang Xiangji
    (Center for Eng. Design and Research under the General Equipment Department, Beijing 100028, China)

Abstract: Net Shell of Shanghai Sheshan Forest theater is a doublelayer spheroidal steel tube structure with a span of 92m, height 27.8m. The net shell's 3D finite element model was created by structrual analysis program ANSYS, and it's static performance was calculated. The ultimate load and eigenvalue buckle load for the net shell were systematically analysed under unsymmetrical loading. The nonlinear stability calculation of the shell was performed based on considering its initial geometrical imperfection, geometric nonlinearity, double nonlinearity of geometric and material. The results show that the ultimate bearing capacity of the shell is determinated by unsymmetrical loading and the double nonlinearity of geometric and material. It has provided a reference for the design and calculation of similar engineerings.
Keywords: net shell;  stability analysis;  geometrical non-linearity;  material non-linearity;  initial geometrical imperfection;  unsymmetrical loading