Morison方程在进水塔动水压力计算中的应用

Application of Morison Equation in Calculation of Hydrodynamic Pressure of Intake Tower

地震时水体会对水工结构产生动水压力,如何简便高效地考虑动水压力作用是进水塔动力响应分析的基础。引入计算深水桥墩波浪力时广泛采用的Morison方程,对其进行扩展,使其可以用于矩形截面的进水塔。推导过程表明,塔内外动水压力均转化为附加质量,附加质量分布与塔体截面形状有直接关系,与水深无关。通过实例将本文方法与水工抗震标准中进水塔附加质量法进行比较,并通过计算动水压力证明了提出方法的适用性。

Hydrodynamic pressure on hydraulic structure is produced by water during earthquake.How to consider hydrodynamic pressure conveniently and efficiently is the basis of dynamic response analysis of intake tower.Morison equation,which is widely used to calculate wave forces on piers in deep water,was introduced into intake tower structure,and Morison equation was extended to make it applicable to tower intake with rectangular section.The results show that the hydrodynamic pressure inside and outside the tower is transformed into addi⁃tional mass,and its distribution is directly related to the cross⁃section shape of the tower body,and has nothing to do with the height of the water body.The extended Morison equation was compared with the added mass formula of intake tower,and the applicability of the proposed method was evaluated by the obtained hydrodynamic pressure.It proves that the extended Morison equation can provide a new way to solve the hydrodynamic pressure of intake tower.