核电常规岛围护结构在龙卷风作用下破坏过程的研究

Study on tornado-induced destruction progress of envelope of conventional island in nuclear power plant

为研究龙卷风荷载作用下核电站常规岛主厂房围护结构的连续破坏情况,首先利用流体计算软件Fluent,获得了常规岛主厂房在龙卷风作用下的风荷载参数。对主厂房位于龙卷风核心半径处时围护结构的连续破坏情况进行了分析。研究表明:在龙卷风作用下,三种不同径向位置计算模型的屋面风荷载均为吸力。当常规岛主厂房位于核心半径时,屋面吸力最大,最先发生掀翻破坏,然后迎风面、背风面和靠近龙卷风中心侧面由于内外压联合作用依次连续破坏。其中迎风面破坏面积比率最大,达到22.2%,远离龙卷风中心侧面未发生破坏。

In order to study the continuous damage of the building envelope of main powerhouse of conventional island in nuclear power plant under the effect of tornado load, the fluid calculation software Fluent was firstly used to obtain the wind loading parameters of the main powerhouse of conventional island under tornado effect. Then, the continuous destruction of the envelope was analyzed when the main powerhouse was located at the core radius of the tornado. The research shows that the roof wind loads of calculation models at three different radial position are all suction under the action of tornado. When the main powerhouse of conventional island is located at the core radius, the roof suction is maximum and is the first damaged by overturning behavior, and then windward side, leeward side and the side close to the tornado center were successively destroyed due to the joint action of internal and external pressure. Among them, the ratio of destruction area of the windward is the largest, reaching 22. 2%, and no damage occurred on the side away from the tornado center.