| At present,the research of liquid sloshing dynamic analysis mainly focuses on the field of mechanics and ship engineering,but the theoretical research of liquid sloshing dynamic analysis for civil and water conservancy engineering is less.At present,there are two main ways to analyze liquid sloshing: one is the potential flow theory of ideal fluid in hydrodynamics,the other is the liquid sloshing analysis considering the interaction of liquid and solid in structural dynamics.The former is the theoretical basis of the latter,but at present,most of the literature is lack of the basic theory and equation of liquid sloshing analysis considering the liquid-solid coupling based on the potential flow theory of liquid sloshing.Lack of relevant theoretical basis may make it difficult to apply the theory to practical problems in the process of liquid-solid coupling research.Therefore,based on the seismic analysis of the structure,it is of great significance to sort out the theoretical equations of two kinds of liquid-solid coupling analysis.Based on the potential flow theory of ideal fluid and the derivation of the equations,the impulsive component and convection component of liquid sloshing are distinguished.On the basis of formula derivation,the dynamic analysis of the liquid-solid coupling system is realized by combining the large-scale commercial finite element software ABAQUS.In addition,in order to solve the problem that the classical Housner model uses the lumped mass element,which is not conducive to the local stress analysis of the shell wall,a distributed hydrodynamic pressure model formula is proposed to carry out the dynamic analysis of liquid sloshing.Finally,the influence characteristics of the range of the water area of liquid-solid coupling are studied.The specific research contents are as follows:(1)Combined with the governing equation of liquid motion in hydrodynamics,which takes the potential function ? as the basic unknown quantity,the governing equation of liquidsolid coupling in structural dynamics is derived in detail,and the distinction between the liquid sloshing impulsive component and the convection component is derived by the boundary condition equation.(2)Combined with ABAQUS finite element software,the acoustic element is used to simulate the liquid and the interaction between the liquid and solid coupling of the liquid tank.The dynamic characteristics of a rectangular rigid liquid tank with fixed bottom under oneway seismic excitation are studied.(3)The sloshing displacement,impulsive and convective hydrodynamic pressure,base shear force and overturning moment response of the free surface of the liquid storage tank under one-way ground motion are studied by comparing CAS and cel methods.The performance of the two methods in dynamic analysis of ground motion of liquid storage tank is compared.(4)Based on the centralized analysis of Housner model,a study on the hydrodynamic pressure distribution model of the liquid storage structure is proposed.By programming,the impulsive and convective hydrodynamic pressure along the height of the tank wall and the sloshing displacement of the free liquid surface are emphatically analyzed.(5)Based on the hydrodynamic pressure distribution model formula of the liquid storage tank,the finite water area dynamic analysis and comparison with different aspect ratio are carried out.Then extended to the dynamic analysis of semi infinite water area,based on Westergaard hydrodynamic pressure distribution formula,the applicability of Housner hydrodynamic pressure distribution model formula in the water area is studied,and the influence characteristics of liquid-solid coupling water area are studied. |
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