Development of wind-resistant suspended membrane roof for rainproof dam construction

防雨坝建设用抗风悬膜屋面的研制

• 批准号: 08555111
• 负责人: KIMURA Kichiro
• 金额: $ 8.19万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555111/
• 关键词: suspended membrane roof; divergence; computational fluid dynamics; coupled analysis; wind tunnel experiment; rainproof construction; wind engineering; 対風大変形挙動; 幾何学的非線形

The suspended membrane roof for rainproof dam construction consists of a membrane that is supported by two parallel cables spanned between the banks. This roof is advantageous because it can be located according to the construction stage and it will not prevent the construction procedure. However, the divergence phenomenon is observed under wind speed of about 20 m/s due to its extremely light and flexible structure. Divergence occurs even under lower wind speed when the wind blows up. The objective of this study is to develop the suspended membrane roof system that withstands even the blow up wind.For the development of the wind-resistant membrane roof, it is essential to understand the divergence occurrence mechanism. Therefore we tried to develop an analytical procedure so that the coupled phenomenon of membrane motion and the wind forces can be solved using 2 dimensional computational fluid dynamics. Because the phenomenon is complicated where the wind force changes the membrane shape that results in the different wind forces, the analysis that couples large amplitude dynamical membrane motion and wind forces have not produced stable computational results yet. Then the static response that affects divergence which is dominant for the membrane stability is tried to be analyzed. By carefully considering the procedure how to couple the membrane motion and the wind forces, we developed the analytical procedure with which the equilibrium membrane shape with the wind force can be obtained. The obtained results qualitatively agreed with the previous experimental results.

用于防雨坝施工的悬挂式薄膜屋面由两条横跨在堤岸之间的平行拉索支撑的薄膜组成。这种屋顶是有利的，因为它可以根据施工阶段进行定位，并且不会阻碍施工程序。而在风速约为20m/S的情况下，由于其结构极其轻巧灵活，出现了发散现象。即使在风速较低的情况下，当风吹大时，也会出现辐散。本研究的目的是开发一种甚至能承受吹起风的悬挂式薄膜屋面系统，对于开发抗风薄膜屋面来说，了解发散的发生机理是必不可少的。因此，我们试图发展一种分析程序，以便可以用二维计算流体力学来解决薄膜运动和风力的耦合现象。由于风力改变薄膜形状从而产生不同风力的现象比较复杂，将薄膜的大振幅动力运动与风力耦合进行分析还没有得到稳定的计算结果。然后对影响发散的静态响应进行了分析，发散对膜的稳定性起主导作用。通过仔细考虑薄膜运动与风力的耦合过程，我们建立了薄膜形状与风力平衡的分析方法。所得结果与前人的实验结果定性一致。