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| Nonlinear stability bearing capacity analysis for a suspended dome based on the initial curvature elements |
| Received:October 16, 2008 |
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| DOI：10.7511/jslx20104026 |
| KeyWord:suspended dome initial curvature prestressed space grid structures nonlinear stability limit load |
| Author | Institution |
| 周臻 |
东南大学 混凝土及预应力混凝土结构教育部重点实验室,南京 ;东南大学 城市工程科学国际研究中心,南京 |
| 吴京 |
东南大学 混凝土及预应力混凝土结构教育部重点实验室,南京 ;东南大学 城市工程科学国际研究中心,南京 |
| 孟少平 |
东南大学 混凝土及预应力混凝土结构教育部重点实验室,南京 ;东南大学 城市工程科学国际研究中心,南京 |
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| Abstract: |
| In the element follow-up coordinate system, the computation formulation considering the influence of initial curvature on the link element is established, and the element stiffness matrix including the effect of initial curvature is derived. Then the tangent stiffness matrix of initial curvature beam element is deduced base on classical beam-column theory. Finally, the nonlinear stability bearing capacity analysis is carried out for the suspended dome structure by using the initial curvature link and beam element, and the influence of the member initial curvature on the structural nonlinear stability performance is investigated. The results show that the structural stiffness and limited bearing capacity are reduced since the member initial curvature exists. In different initial prestressing states, the limit load is linearly reduced with the increase of initial curvature and the relation curves between them are parallel. The proposed initial curvature element in this paper can be generally applied into the nonlinear analysis of various kinds of space grid structures, which provides more scientific accordance for the structural design. |
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