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Wind-induced response and resultant load estimation of long-span spherical domes

大跨度球形穹顶的风致响应及合成荷载估算

基本信息

批准号：
07650653
负责人：
UEMATSU Yasushi
金额：
$ 1.28万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650653/
关键词：
single-layr latticed dome wind-induced response wind load wind tunnel dynamic response analysis vibration characteristics wind resistant design

项目摘要

Time-space correlation of wind pressures and wind-induced response of spherical domes with long spans have been investigated based on a simultaneous pressure measurements in a wind tunnel as well as on a dynamic response analysis of the dome in the time domain. The subjects of this research are a circular flat roof and a rigidly-jointed single-layr latticed dome with triangular net work.(1)Dynamic response and resultant load estimation of a flat roofThe span/height ratio of the model was changed from 1 to8. The dynamic response of the roof was analyzed in the time domain as well as in the frequency domain, using the experimental data of the wind pressures. In the analysis, both the deflection and the bending moment were considered as the most important responses. The results indicate that the equivalent static pressure, which reproduces the maximum response, can be evaluated by using a gust loading apporoach. The effects of various parameters on the gust loading factor were investigated. Based on the results, an empirical formula for estimating the gust loading factor was provided.(2)Wind loads and dynamic response of rigidly-jointed single-layr latticed domeNine models with different rise/span and wall-height/span ratios were tested. First, the structure of the pressure field on the dome was investigated using a proper orthogonal decomposition technique. It is found that the characteristics of the fluctuating pressure field can be represented by a quasi-steady theory. Then, the dynamic response of model domes was analyzed in the time domain. The results indicate that the dynamic response is dominated by several specific modes ; that is, the first three of four axisymmetric modes and a few lower asymmetric modes with small wave numbers both in the circumferential and radial directions. A simple approach for evaluating the dynamic response was proposed.

通过风洞测压试验和时域动力响应分析，研究了大跨球面网壳的风压时空相关性和风振响应。本文研究的对象是圆形平屋盖和三角形网壳刚接单层网壳。（1）平屋盖的动力响应及荷载估算模型的跨高比从1变为8。利用实测的风压数据，在时域和频域分析了屋盖的动力响应。在分析中，挠度和弯矩都被认为是最重要的响应。结果表明，再现最大响应的等效静压可以用阵风加载法来计算。研究了各种参数对阵风载荷因子的影响。在此基础上，提出了估算阵风载荷因子的经验公式。（2）对9个不同矢跨比和墙高跨比的单层刚接网壳模型进行了风荷载和动力响应试验。首先，利用正交分解技术研究了导流罩上压力场的结构。结果表明，脉动压力场的特性可用准定常理论来描述。在此基础上，对模型穹顶进行了时域动力响应分析。结果表明，结构的动力响应主要由几种特定的模态所控制，即前三种轴对称模态和少数几种周向和径向波数较小的低阶非对称模态。提出了一种简单的动态响应计算方法。