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首页> 外文会议>Third International Conference on Coupled Instabilities in Metal Structures CIMS'2000, 3rd, Sep 21-23, 2000, Lisbon-Portugal >COUPLED GLOBAL INSTABILITIES IN PITCHED-ROOF FRAMES
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COUPLED GLOBAL INSTABILITIES IN PITCHED-ROOF FRAMES

机译：斜屋顶框架上的全球不稳定性

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摘要

The objective of this paper is to present the results of a study concerning coupled global instabilities in pitched-roof frames. The nature (stability and symmetry) of the post-critical equilibrium paths associated to the anti-symmetric (ASM), symmetric (SM) and coupled (CM) modes is investigated and the corresponding frame imperfection-sensitivities are established. The behaviour of 2 d.o.f. mechanical model is first (analytically) studied, after which both analytical and numerical (FEM) results are obtained for real pitched-roof frames. The analytical results presented deal with the post-buckling behaviour of perfect frames associated to bifurcation in the ASM, SM and CM. The imperfect frames are analysed by means of the FEM and the results used to establish and discuss the frame imperfection-sensitivity under mode interaction. In particular, the most detrimental imperfection configuration is identified.
机译：本文的目的是介绍有关斜屋顶框架中整体耦合不稳定性的研究结果。研究了与反对称（ASM），对称（SM）和耦合（CM）模式相关的临界后平衡路径的性质（稳定性和对称性），并建立了相应的帧缺陷敏感性。 2 d.o.f.的行为首先（解析地）研究了力学模型，然后获得了真实的斜屋顶框架的解析和数值（FEM）结果。提出的分析结果处理了与ASM，SM和CM中的分叉相关的完美框架的后屈曲行为。通过有限元分析不完美的框架，并将结果用于建立和讨论模式交互作用下的框架不完美敏感性。特别地，识别出最有害的缺陷配置。

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