西安建筑科技大学学报(自然科学版)

大跨度双曲屋盖结构形状复杂,目前国内外规范尚未对此类结构的风压系数给出明确规定.为此,本文针对四种典型形状大跨度双曲屋盖,研究其分区风压系数,为工程实践提供有利参考.首先研究分析流场参数、屋盖自身的几何参数等对其表面风压分布的作用,分析得到最不利参数.然后针对各大跨度双曲屋盖的特点,分析并总结出在常用工程高度范围,各典型形状的大跨度双曲屋盖的分区风压系数建议值,并与现行规范中的类似情况比较,为类似结构的实际工程抗风设计提供有益的理论支持和实际参考.

The structure of long-span hyperbolic roofs is complex. At present, domestic and foreign codes have not provided explicit rules for the wind pressure coefficients of such structures. For this reason, this paper focuses on the wind pressure coefficients of four types of long-span hyperbolic roofs and provides a favorable reference for construction practice. Firstly, the effects of flow field parameters and geometric parameters of the roof itself on the surface wind pressure distribution characteristics are analyzed as well, and the most unfavorable parameters are analyzed as well. Then, based on the characteristics of the long-span hyperbolic roofs, the recommended values of the partitioned wind pressure coefficients for the long-span hyperbolic roofs of typical shapes within the common height range were summed up and compared with the similar conditions in the current specifications. And it also provides theoretical support and practical reference for wind resistance design of similar structures.

引言
1 CFD数值模拟
2 流场参数对屋盖表面风压分布的影响
3 几何模型参数对屋盖表面风压分布的影响
4 平均风压系数的合理建议值
5 结论

图1 双曲屋盖的几何模型及各相关参数的定义图<br/>Fig.1 The geometry models of large-span hyperbolic roofs and parameter definition

图1 双曲屋盖的几何模型及各相关参数的定义图
Fig.1 The geometry models of large-span hyperbolic roofs and parameter definition

图2 风向及测量方向示意图<br/>Fig.2 Wind direction and measurement direction

图2 风向及测量方向示意图
Fig.2 Wind direction and measurement direction

表1 计算模型尺寸表<br/>Tab.1 Computing model size table

表1 计算模型尺寸表
Tab.1 Computing model size table

图3 计算模型网格划分图<br/>Fig.3 Computational model meshing

图3 计算模型网格划分图
Fig.3 Computational model meshing

图4 平均风压系数分布示意图<br/>Fig.4 Schematic diagram of average wind pressure coefficient distribution

图4 平均风压系数分布示意图
Fig.4 Schematic diagram of average wind pressure coefficient distribution

表2 数值试验工况的试验参数<br/>Tab.2 Test parameters of numerical test condition

表2 数值试验工况的试验参数
Tab.2 Test parameters of numerical test condition

图5 0°风向角下平均风压系数分布示意图<br/>Fig.5 Distribution of average Cp at 0° wind direction angle

图5 0°风向角下平均风压系数分布示意图
Fig.5 Distribution of average Cp at 0° wind direction angle

图6 90°风向角下平均风压系数分布示意图<br/>Fig.6 Distribution of average Cp at 90° wind direction angle

图6 90°风向角下平均风压系数分布示意图
Fig.6 Distribution of average Cp at 90° wind direction angle

表3 计算模型尺寸表<br/>Tab.3 Computing model size table

表3 计算模型尺寸表
Tab.3 Computing model size table

图7 屋盖表面平均风压系数对比曲线<br/>Fig.7 Average wind pressure coefficient comparison curve

图7 屋盖表面平均风压系数对比曲线
Fig.7 Average wind pressure coefficient comparison curve

表4 计算模型尺寸表<br/>Tab.4 Computing model size table

表4 计算模型尺寸表
Tab.4 Computing model size table

图8 屋盖表面平均风压系数对比曲线<br/>Fig.8 Comparison curve of average Cp on roof surface

图8 屋盖表面平均风压系数对比曲线
Fig.8 Comparison curve of average Cp on roof surface

表5 计算模型尺寸表<br/>Tab.5 Computing model size table

表5 计算模型尺寸表
Tab.5 Computing model size table

图9 屋盖表面平均风压系数对比曲线<br/>Fig.9 Comparison curve of average Cp on roof surface

图9 屋盖表面平均风压系数对比曲线
Fig.9 Comparison curve of average Cp on roof surface

表6 计算模型尺寸表<br/>Tab.6 Computing model size table

表6 计算模型尺寸表
Tab.6 Computing model size table

图10 方形双曲屋盖表面压力测点分布图<br/>Fig.10 Square hyperbolic roof surface pressure measuring point distribution map

图10 方形双曲屋盖表面压力测点分布图
Fig.10 Square hyperbolic roof surface pressure measuring point distribution map

图11 平屋盖分区图<br/>Fig.11 The zoning maps of flat roof

图11 平屋盖分区图
Fig.11 The zoning maps of flat roof

表7 平屋盖分区风压系数<br/>Tab.7 Partition wind pressure coefficient of flat roof

表7 平屋盖分区风压系数
Tab.7 Partition wind pressure coefficient of flat roof

图12 平均风压系数曲线图<br/>Fig.12 Average wind pressure coefficient curve

图12 平均风压系数曲线图
Fig.12 Average wind pressure coefficient curve

图13 平均风压系数的分区对比图<br/>Fig.13 Partition comparison chart of average wind pressure coefficient

图13 平均风压系数的分区对比图
Fig.13 Partition comparison chart of average wind pressure coefficient

表8 计算模型尺寸表<br/>Tab.8 Computing model size table

表8 计算模型尺寸表
Tab.8 Computing model size table

图14 圆弧形双曲屋盖表面压力测点分布图<br/>Fig.14 Curved point distribution map of arc-shaped hyperbolic roof

图14 圆弧形双曲屋盖表面压力测点分布图
Fig.14 Curved point distribution map of arc-shaped hyperbolic roof

图15 平均风压系数曲线图<br/>Fig.15 Average wind pressure coefficient curve

图15 平均风压系数曲线图
Fig.15 Average wind pressure coefficient curve

图16 平均风压系数分区图<br/>Fig.16 The partition figure of Cp on the roof surface

图16 平均风压系数分区图
Fig.16 The partition figure of Cp on the roof surface

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备注

引言

1 CFD数值模拟

2 流场参数对屋盖表面风压分布的影响

3 几何模型参数对屋盖表面风压分布的影响

4 平均风压系数的合理建议值

5 结论

期刊信息