Further Insights into Postbuckling of Web Panels. I: Review of Flange Anchoring Mechanism
Further Insights into Postbuckling of Web Panels. I: Review of Flange Anchoring Mechanism
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对腹板后屈曲的进一步见解。
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
C. H. Yoo
中科院分区：
文献类型：
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作者：
S. C. Lee;Doo;C. H. Yoo
本研究重新探讨锚定机制被认为是来源的后屈曲强度的板梁腹板。在经典的张力场理论中，已经隐含地假设，如果不求助于翼缘和/或相邻板的锚固机构，则张力场不能在腹板中形成。翼缘锚固机理在实际板梁中的作用因理论而异。在本研究中发现，无论翼缘有多重，如果没有横向加劲肋，锚固机制几乎不会发展，横向加劲肋具有足够的轴向刚度，以防止翼缘在锚固作用期间向内移动腹板。在实际板梁中，翼缘锚固机构对屈曲后强度的贡献小得可以忽略不计，这不是因为翼缘太柔而不能起到锚固作用，而是因为横向加劲肋轴向太柔而不能支撑翼缘。在实际设计中利用翼缘锚固机构是不可能的，因为它需要横向加劲肋具有难以想象的高轴向刚度。
This study revisits the anchoring mechanism believed to be the source of the postbuckling strength of plate girder web panels. In classical tension field theories, it has been implicitly assumed that a tension field cannot develop in the web panel without recourse to the anchoring mechanism of the flanges and/or adjacent panels. The contribution of the flange anchoring mechanism in practical plate girders differs from theory to theory. It has been found during this study that the anchoring mechanism hardly develops, no matter how heavy the flanges are, without transverse stiffeners that have sufficient axial stiffness necessary to keep the flanges from moving the web panel inwards during the anchoring action. In practical plate girders, the contribution of the flange anchoring mechanism to the postbuckling strength is negligibly small not because the flanges are too flexible to function as anchors but because the transverse stiffeners are axially too flexible to support the flanges. Taking advantage of the flange anchoring mechanism in practical designs is beyond the realm of possibility because it requires an inconceivably high axial stiffness of the transverse stiffeners.