大型空泡水洞试验设施是目前中国规模最大的水洞系统，为评估其整体结构强度和抗震设计安全性，对空泡水洞结构进行三维有限元数值分析，考虑正常工作工况和地震载荷作用极限工况下的结构刚强度，基于振型分解反应谱法计算了地震惯性加速度载荷，并对结构地震位移响应进行校核。结果表明：空泡水洞的结构变形在正常工作工况主要表现为水洞内壁的膨胀变形，在极限工况下主要表现为由地震载荷引起的水洞顶部水平位移；空泡水洞高应力区域主要位于结构角隅处的筒壁和加强筋。这对中国自主研发大型空泡水洞具有重要的借鉴意义。

The large-scale cavitation water tunnel testing facility is currently the largest water tunnel system in China. To evaluate the structural strength and seismic design safety of the large cavitation water tunnel test facility, a three-dimensional numerical analysis of the water tunnel structure was carried out. The finite element model of the complete structure of the cavitation water tunnel was established, and the structural strength under the normal working condition and the extreme working condition considering the seismic load was calculated and analyzed. The seismic inertial acceleration load was calculated based on the mode-superposition response spectrum method, and the seismic displacement response of the structure was checked. The results show that the structural deformation of the cavitation water tunnel is mainly reflected in the expansion deformation of the inner wall of the water tunnel under the normal working condition, and mainly reflected in the horizontal displacement of the top of the water tunnel caused by the seismic load under the extreme working condition. The high stress regions of the water tunnel are mainly located on the inner wall and the stiffener at the corner of the structure, which can pay the way for building the large cavitation water tunnel of our country in the future.