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Study on Ultimate Strength of Single-Layer Latticed Domes

单层格子穹顶极限强度研究

基本信息

批准号：
09650618
负责人：
OGAWA Toshiyuki
金额：
$ 1.73万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

The purpose of this study is to investigate the ultimate strength of single-layer latticed domes under the influence of the geometrical imperfections and loading conditions. To examine the fundamental elasto-plastic buckling behavior of the dome without geometrical initial imperfections, the elasto-plastic analysis is carried out. Next, the buckling behavior of the domes with geometrical initial imperfections is examined. Then we carried out the model experiment of span 4.6m. Loading types are concentrated load, one-side uniform load and uniform load with additional concentrated load. As a result, the buckling load of the domes reduced considerably by the existence of the additional load and the initial imperfections. Summaries of the results obtained may be as follows.The elasto-plastic buckling behavior of the rigidly jointed single-layer latticed dome is estimated by the slenderness ratio of the dome lambdas. For the domes without geometrical initial imperfections, for the domes with is <0.80, the elasto-plastic buckling load is smaller than the elastic buckling load, And these domes are collapsed by general buckling. For the domes with 0.80 < ls < 1.0, the domes are collapsed by node buckling. For the domes with geometrical initial imperfections, as the value of ls increases, the elasto-plastic buckling load decreases. Especially, the elasto-plastic buckling load of the dome which is collapsed by node buckling is greatly influenced by geometrical initial imperfections. The elasto-plastic buckling load is estimated by using Modified Dunkerley Formulation as the function of lambdas as well as the function of LAMBDA.

本文研究了几何缺陷和荷载条件对单层网架穹顶极限强度的影响。为了研究无几何初始缺陷的穹顶的基本弹塑性屈曲行为，进行了弹塑性分析。其次，研究了具有几何初始缺陷的穹顶的屈曲行为。然后进行了跨度4.6m的模型试验。荷载型式有集中荷载、单边均布荷载和均布附加集中荷载。结果表明，附加荷载和初始缺陷的存在大大降低了穹顶的屈曲载荷。所得结果摘要如下。利用单层网壳的长细比估算了刚连接网壳的弹塑性屈曲行为。对于没有几何初始缺陷的圆顶，对于<0.80的圆顶，弹塑性屈曲载荷小于弹性屈曲载荷，这些圆顶是由一般屈曲破坏的。对于0.80 < ls < 1.0的穹顶，穹顶是通过节点屈曲破坏的。对于具有几何初始缺陷的穹顶，随着ls值的增大，弹塑性屈曲载荷减小。特别是节点屈曲破坏的穹顶弹塑性屈曲载荷受几何初始缺陷的影响较大。采用修正Dunkerley公式作为LAMBDA函数和LAMBDA函数对弹塑性屈曲载荷进行估计。