基于声学单元动水压力作用下的进水塔损伤特性分析

Damage Characteristics Analysis of Water Intake Tower under HydrodynamicPressure of Acoustic Unit

针对附加质量法不能充分考虑库水—结构的耦合震动的影响,通过ABAQUS建立的库水-进水塔系统有限元模型,探讨基于声学介质理论的进水塔与库水的耦合作用。结果表明:与附加质量法相比,基于声学单元建立的塔-水模型的自振频率变大,动水压力减小,进水塔塔顶总位移减小66.77%,加速度减小10.67%,进水塔最大拉应力减小19.92%,压应力减小21.11%,进水塔的损伤面积和损伤程度变小,进水塔的安全性有所提高。因此,声学单元模型在实际工程设计中具有一定的精准性和适用性,为研究进水塔-库水耦联振动问题提供新思路。

In view of the fact that the additional mass method cannot truly reflect the influence of hydrodynamic pressure in the complex struc⁃ture of water surrounded by four sides of the intake tower,this paper discusses the coupling effect between the intake tower and the reservoir water based on the acoustic medium theory through the finite element model of the reservoir water-intake tower system established by ABAQUS.The results show that compared with the additional mass method,the natural vibration frequency of the tower-water model based on acoustic element increases,the hydrodynamic pressure decreases,the total displacement of the top of the water intake tower decreases by 66.77%,the acceleration decreases by 10.67%,the maximum tensile stress of the water intake tower decreases by 19.92%,the compressive stress decreases by 21.11%,and the damage area and degree of the water intake tower decrease.The safety of the water intake tower has im⁃proved.Therefore,the acoustic unit model has certain accuracy and applicability in the actual engineering design,and provides a new idea for the study of the dynamic water pressure of the water intake tower.