| 矢跨比对弦支穹顶整体稳定性的影响 |
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| 引用本文： | 朱慈勉,刘明辉.矢跨比对弦支穹顶整体稳定性的影响[J].结构工程师,2009,25(2). |
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| 作者姓名： | 朱慈勉 刘明辉 |
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| 作者单位： | 同济大学建筑工程系,上海,200092 |
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| 摘 要： | 随着弦支穹顶在我国的逐步应用,其整体稳定问题日益突出.以两种矢跨比弦支穹顶为例,得出不同矢跨比弦支穹顶的缺陷敏感性规律.研究表明:进行特征值分析时,应不断调整外部荷载使结构的第一阶特征值为1.0,否则将产生虚假的特征值和屈曲模态,以及对结构的极限承载力的过高估计;矢跨比为1/10的弦支穹顶为缺陷敏感性结构,预应力的引入不足以改变其初始后屈曲性状,应严格执行网壳规范对其进行分析;矢跨比为1/15的弦支穹顶为缺陷不敏感结构,但在计算时结构不会自动进入分支路径,应以其特征值为参照,判断其失稳类型,并加入初始扰动使其进入分支路径.
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| 关 键 词： | 弦支穹顶 缺陷敏感性 一致缺陷模态 分支屈曲 极值屈曲 |
Influence of Rise-to-Span Ratio on Global Stability of Suspen-Dome Structures |
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| ZHU Cimian,LIU Minghui.Influence of Rise-to-Span Ratio on Global Stability of Suspen-Dome Structures[J].Structural Engineers,2009,25(2). |
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| Authors: | ZHU Cimian LIU Minghui |
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| Affiliation: | Department of Building Engineering;Tongji University;Shanghai 200092;China |
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| Abstract: | Along with the gradual application of suspend-dome structures,the global stability of this kind of structure is becoming increasingly pronounced.In this paper,taking two different rise-to-span ratio suspen-dome structures as examples,imperfection sensitivity of different rise-to-span ratio suspen-dome structures was obtained.Design guidelines were also given to refer for practical projects.The calculation results show that the load should be adjusted continuously so that the first eigenvalue becomes 1.0,oth... |
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| Keywords: | suspen-dome structure imperfection sensitivity consistent imperfection mode bifurcation buckling limit buckling |
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