摘要
提出了一种组合肋壳结构，基于非线性有限元理论。利用空间梁单元和曲边壳单元，考虑空间结构的几何非线性影响，推导了T．L坐标系下组合肋壳单元刚度矩阵，采用增量迭代法和弧长法，求得40m跨球面组合肋壳的极限承载力，并讨论了在不同矢跨比，不同边界条件下结构的极限承载力。得到了不同工况下极限承载力的变化趋势及非线性极限承载力与线性极限承载力的比值为0．66结论对工程设计有一定的参考价值。
A composite ribbed shell structure is presented, Based on the nonlinear finite theory, the geometrical nonlinear element stiffness matrix is derived by using space beam element and bended shell element. Modified Newton- Raphson and arc-length are used to find the ultimate bearing capacity of the 40m composite shell; the study on the buckling mode and ultimate bearing capacity is made under different conditions. The affection of different condition to the structure is found and the ratio of nonlinear ultimate load to the linear one is 0.66. This solution is valuable to the engineering design.
出处
《建筑技术开发》
2006年第11期14-16,23,共4页
Building Technology Development
基金
陕西省教育厅专项基金（03JK194）
关键词
组合肋壳
几何非线性
极限承载力
Composite ribbed shell
Geometrical nonlinear
Ultimate bearing capacity
