基于流固耦合的高耸进水塔动水压力分布研究

Study on Hydrodynamic Pressure Distribution of High Intake Tower Based on Fluid-structure Interaction

根据水体的不可压缩假定,计入重力波和水体自由表面影响,采用流固耦合理论结合时程分析法对高耸进水塔结构动响应进行研究,结果表明,在地震荷载作用下,水体对水中结构的影响具有明显的非线性。水体不仅产生一定的附加质量作用,同时还存在一定的惯性耦合作用;进水塔动水压力沿高程呈非线性分布,且塔体内外同高程动水压力值不同,但沿高程分布曲线的包络线都呈近似半双曲线形式,动水压力最大值出现在水体自由表面以下一定距离处。所得结论对正确认识结构在地震荷载的反应、指导结构设计有重要意义。

The distribution of hydrodynamic pressure of high intake tower is analyzed by using fluid-structure interaction theory and time-history method after assuming the water body can not be compressed and considering the effects of gravity waves and water free surface. The results indicate that the interaction between water and structure is nonlinear under the action of seismic loads. The water not only acts in the form of the added mass, but also the inertial coupling effect. The distribution of hydrodynamic pressure is nonlinear along the elevation of intake tower, and the hydrodynamic pressure is different at the outside and inside of tower with same elevation. The envelope curve of hydrodynamic distribution is closed to half-hyperbola, and the maximum hydrodynamic pressure has a certain meters below the free surface of water body. The study is significant to correctly understand the responses of structure to seismic loading and guides the structural design.