摘要
提出了一种球面组合肋壳截面形式,基于非线性有限元理论,采用空间梁单元和等厚曲边壳单元,考虑空间结构的几何非线性影响,推导了T.L坐标系下组合肋壳非线性单元刚度矩阵。分别讨论了在不同矢跨比、不同荷载作用、不同边界条件下组合肋壳的极限承载力和失稳形态。由大量算例得到了非线性极限承载力与线性极限承载力的比值为0.66及不同情况下结构承载力变化趋势,组合肋壳的极限承载力比混凝土壳承载力提高20%。
A composite ribbed shell structure form is presented. Considering the nonlinear finite theory, the geometrical nonlinear element stiffness matrix is derived by using space beam element and bended shell element. Study on the buckling mode and ultimate beating capacity is made under different conditions such as height - span - ration, loading and boundary condition. From a mount of samples, the ratio of nonlinear ultimate load to the linear one is 0.66, and the affection of different condition to the structure is found. The ultimate bearing capacity of spherical composite shell is 20 percent more than that of the concrete shell.
出处
《四川建筑科学研究》
北大核心
2006年第5期26-29,共4页
Sichuan Building Science
基金
陕西省教育专项基金(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
