落地式拱形体育场看台挑篷结构CFD分析

CFD numerical simulation research on palaestra stand arch roof linked with ground

以某后端开口的落地式拱形体育场看台挑篷为背景,采用计算流体力学(CFD)软件Fluent得到该结构的风压力、风压系数分布以及结构附近的流场分布。对风压和流场分布进行了详细的描述和讨论,发现这种挑篷形式与一般悬挑式体育场看台挑篷类似,最不利工况为风从前缘正面吹来对屋盖造成的强大上吸力。在实际设计中挑篷体型系数可分别取为-2.5,1.0进行风吸和风压工况的验算。当风从看台屋盖后侧吹来时会在临近看台的跑道和比赛场地上形成湍流,可能会对竞技活动的进行造成不良影响,应该格外引起注意。

The distribution of wind pressure and wind-pressure coefficient on an arch roof covering the stand of a palaestra was studied by applying the CFD software Fluent.The fluid field condition around the roof was also studied.The arch roof has a gap at its back and links with ground.It shows that the most unfavorable load case is the arch roof suffering wind load in its front face under which the roof suffers a powerful upward load,and the phenomenon is similar with the traditional cantilever roof.Shape coefficient of the roof structure can be-2.5 and 1.0 respectively in order to simulate the upward and downward wind loads.Turbulence happens in the raceway and the field,which may make harmful effect to the gymkhana when wind load applies on the roof in the backward direction.