开敞式拱形波纹钢屋盖的风压分布及体型系数研究  

Study on wind pressure distribution and shape coefficients of open-style arched corrugated steel arch roof

作　　者：贾永新[1] 张勇[1] 李斌 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]山东新兴建筑规划设计研究院,山东潍坊261011

出　　处：《建筑结构学报》2010年第S2期159-164,共6页Journal of Building Structures

摘　　要：利用CFD数值模拟技术,结合实际工程对建筑和结构各个方面的要求和限定,首先对开敞式拱形波纹钢屋盖下部支承结构的柱高和柱距两因素进行了变参数分析,从中可确认这两个参数对屋盖结构的风压分布影响不大。然后选定影响屋盖风压分布的3个主要参数:跨度、矢跨比和纵跨比,进行了三参数三水平正交试验分析。对大量的计算结果进行分析整理,得出此类结构上风压的分布规律,即风压在上表面分布比较均匀,具体表现为在迎风面为压力,在拱顶处和背风面为吸力,风压等值线在四周边缘出现集中;而在下表面两端由于旋涡脱落出现两个负压区,整体上表现为正压力。进一步了明确对此类结构风压分布影响显著的参数为矢跨比。最后参照我国现行《建筑结构荷载规范》的形式,给出了开敞式拱形波纹钢屋盖结构的风荷载体型系数,供设计施工人员参考使用。Considering all the engineering aspects of architectural and structural requirements and restrictions,firstly,two variable parameters,the column height and the column spacing of lower supporting structure of open-style arched corrugated steel roofs,are analyzed with CFD numerical simulation technique.It is confirmed that the two parameters have little effects on the distribution of the wind pressure on roof.Then three other parameters,span,rise-to-span ratio and length-to-span ratio,are selected.The orthogonal test method is adopted to study the effects of the three parameters and the regularities of the distribution of wind pressure are obtained: The pressure distribution is uniform on the outer surface,which is pressure in the windward side and suction in other sides of the roof.The wind pressure contour appears concentrated around the edges;For the inner surface,the wind pressure contour at both ends appears two negative pressure zones due to vortex shedding,while at other parts shows positive pressure.Further study suggests that rise-to-span ratio has significant effects on the wind pressure distribution.Finally,the shape coefficients of such structure are derived by reference to the current Chinese 'Building Structural Load Code',which can be used in the wind-resistant design for this kind of structures.

关 键 词：拱型波纹钢屋盖结构 开敞式 正交分析 风压分布 体型系数 

分 类 号：TU392.5[建筑科学—结构工程]