大跨度屋面风压分布的插值计算方法  

Interpolation method for the calculation of wind pressure distributions on long-span roofs

作　　者：李本悦[1] 楼文娟[1] 邓华[1] 

机构地区：[1]浙江大学土木系,浙江杭州310027

出　　处：《空间结构》2003年第4期17-21,共5页Spatial Structures

基　　金：国家自然科学基金资助项目(50108014).

摘　　要：大跨度结构由于跨度大、体型复杂等特点,风流经过时会产生复杂的气流分离和再附着,因而其表面上的风压分布较为复杂.刚性模型试验是测量大跨度屋面结构风压分布较有效的方法,但是刚性模型试验只能布置有限的测点,得出有限测点的风压系数.本文利用二元函数和多元函数的分段低次插值方法,求出风压系数分布的插值函数,进而反映整个屋面的风压分布情况,此方法能避免高阶插值方法带来的"龙格"现象;利用外插技术可以处理边缘部位和不规则的平面形状;并且通过坐标变换或投影平面代替曲面等方法可以处理球壳及曲面屋盖的风压分布插值计算.Due to long span and diverse shape of long-span roofs, airflow will separate and re-attach and then wind pressure distribution will be complicated. Rigid model wind tunnel test is a useful method to obtain wind pressure coefficients on the limited measuring point. In this paper, piecewise low-order interpolation method of two-dimensional and multi-dimensional function is used to determine wind pressure distributions on the whole roof surface. This method can avoid 'Runge' phenomenon of high-order interpolation. Edge region and irregular plane shape can be dealt with by extrapolation. Wind pressure distributions on spherical shell or curving roofs can be obtained by the method of coordinate transform or projected plane of curved surface.

关 键 词：大跨度屋面 风压系数 二元插值 多元插值 分段低次插值 

分 类 号：TU312.1[建筑科学—结构工程]