拱形屋面风致积雪分析

Analysis of Wind-induced Snow Cover on Arched Roof

为掌握拱形屋面积雪分布情况,降低其风雪灾害,通过对积雪现场进行调查,根据积雪实际分布与灾害情况,利用Fluent软件,建立拱形屋面的风致积雪分析模型,考虑空气相相对速度、空气相速度、空气相相对角速度、雪密度等影响因素,模拟拱形屋面风致积雪分布。通过分析,找出影响屋面积雪沉积的主要因素,建立风雪效用湍流模型,进而对拱形屋面积雪产生的压强统计数据开展详细分析,提出拱形屋面积雪不均匀分布系数取值的建议,以弥补我国现行规范对积雪均匀分布系数取值考虑较充分,对不均匀分布系数取值考虑不足的情况。

In order to determine snow cover distribution exactly,reduce the snow and wind disasters,the field survey of snow cover distribution of building was carried out.By using the software Fluent,the numerical models of wind-induced snow cover on arched roof were set up considering air-phase relative velocity,air-phase velocity,air-phase relative angular velocity,snow density and other factors to simulate the distribution of wind-induced snow cover on arched roof.By analyzing the data,the main factors affecting the snow cover distribution on the roof were found out,the turbulence model of wind and snow effect was established,and the statistical data of the pressure generated by the snow cover on the arched roof was analyzed in detail,and suggestion of the value of the uneven distribution coefficient of the snow cover on the arched roof was proposed,in order to make up for the situation that the current norms in China have more adequate consideration for the value of the uniform distribution coefficient of snow cover,but inadequate consideration for the value of the uneven distribution coefficient.