考虑龙卷风袭击角变化的核电站常规岛围护结构破损研究

Research on tornado-induced envelope damage of conventional island in nuclear power plant under different tornado attack angles

我国规范中,仅给出了围护结构完整的核电站常规岛主厂房龙卷风荷载的计算方法,并未对厂房围护结构的破损进行讨论。利用单向流固耦合方法,模拟了不同龙卷风袭击角下的厂房围护结构破坏过程,计算了厂房各面的破损率,在此基础上研究了龙卷风袭击角对核电常规岛主厂房围护结构破坏的影响,总结了厂房围护结构在龙卷风作用下的一般破坏规律。研究表明,当龙卷风袭击角变化时,厂房围护结构总是屋面迎风处首先破坏,之后迎、背风面及侧面相继破坏;且当袭击角为0°、90°时,厂房迎、背风面破损率较大,侧面破损率较小;当袭击角为45°时,厂房各面破损率均较大。

In Chinese standard,there are no discussions around the damage of factory building envelope structure but only the calculation method for tornado load on main building of conventional island in nuclear power plant.The damage processes of the building envelope structure under different tornado attack angles are simulated using the one-way fluid-structure interaction method,besides,the damage rate of all sides of the building are calculated.Based on this,the influence of tornado attack angle on the damage of the main building envelope structure of conventional island in nuclear power plant is studied,and the general failure law of the plant envelope in the tornado is summarized.The results show that when the tornado attack angle changes,the building envelope structure is often first destroyed on the windward side of the roof,then comes the windward,leeward and lateral side.When the attack angle is 0°or 90°,the damage rate of the windward and leeward side of the building is higher,while the damage rate of lateral side is lower.When the attack angle is 45°,the damage rate on all sides of the building is comparatively high.