论文部分内容阅读
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 the actual structure, the structure of spherical shell coal storage reticulated shell is connected with the coal trestle, the existence of the trestle hole will make the surface wind load more complicated. In our current code, No clear design rules. Based on this, using FLUENT software and computational fluid dynamics (CFD), the SST? -? Turbulence model is used to calculate the wind load distribution of the open reticular shells. The wind pressure coefficient distribution on the surface of the shell was analyzed when the ratio of sag to span, the velocity of incoming flow, the height of reticulated shell, the wind direction angle, the radius of spherical surface and the size of the entrance of the bridge were changed. The analysis results show that the ratio of crosswise span, wind direction angle and spherical radius have a great influence on the wind pressure distribution on the shell surface. The size of the trestle hole has a significant influence on the local wind pressure coefficient on the surface of the shell. Based on this special structure, the fitting formula for calculating the wind pressure coefficient is deduced and applied to the existing wind tunnel test results. Distribution of changes in the same rule, fitting better.