多参数影响下开洞口煤仓表面风压系数拟合研究  

Study on fitting of wind pressure coefficients on opening round coal bunker surface under effects of different parameters

作　　者：殷志祥[1] 姜昕彤[1] 崔翰博[1] 

机构地区：[1]辽宁工程技术大学力学与工程学院,阜新123000

出　　处：《应用力学学报》2017年第3期546-552,共7页Chinese Journal of Applied Mechanics

摘　　要：在实际结构中球形储煤仓的网壳结构都与输煤栈桥相连,栈桥洞口的存在会使网壳表面风荷载变化更为复杂,我国现行规范中对网壳上开洞口的特殊建筑风压没有明确的设计规定。基于此,运用FLUENT软件和计算流体力学(CFD),采用SST?-?湍流模型,对开洞煤仓球面网壳的风荷载分布规律进行了数值风洞计算。分析了当矢跨比、来流风速、网壳高度、风向角、球面半径、栈桥洞口尺寸改变的情况下网壳表面的风压系数分布规律。分析结果表明,矢跨比、风向角、球面半径对网壳表面风压分布有较大影响。栈桥洞口尺寸对网壳表面局部的风压系数有较大影响,针对此种特殊结构推导出了计算风压系数的拟合公式,并将公式应用到已有的风洞实验结果,发现风压分布变化规律大致相同,拟合情况较好。In a spherical storage bunker where the net shell structure is connected with the coal-conveyer-gallery,the existence of interface with the gallery makes distribution of wind load on the net shell surface complicated.Moreover,there is no clear guiding rule in the design specification for the design of special structure with an open hole in the net shell.To study such problem,the FLUENT software is adopted to simulate the wind pressure based on the SST?-?turbulence model in computational fluid dynamics(CFD).The effects of the rise-span ratio,the wind speed,the height of the net shell,the wind direction angle,the radius of sphere and size of the hole connected with the gallery,on the distribution of wind pressure are analyzed.The factors of rise-span ratio,wind direction angle and radius of sphere are found to have global influence on the distribution of the wind load on the net shell surface and size of the hole connected with the gallery is proved to have influence in local areas.Based on above analysis,we propose a fitting formula to calculate the coefficients of wind pressure and it works well when applied to existing experimental data.

关 键 词：球形煤仓网壳 数值模拟 风压系数 拟合公式 

分 类 号：TU311.3[建筑科学—结构工程]