Using SAP2000 you can model water loads as hydrostatic pressure acting on a area element using joint patterns to determine the variable pressure values according to the joint coordinate.
Also, you can generate autowave loads applied to frame elements with previous knowledge of all the wave parameters.
If you are designing a concrete water containing structure under dynamic loads, you can use the specified procedure in the ACI 350.3-06, Seismic Design of Liquid-Containing Concrete Structures. Using this code you can determinate the impulsive and convective components of water pressure inside a concrete tank, and you can use these values and introduce them in a SAP2000 model with an adecuate use of joint patterns.
i was trying to analyse a water tank which is made of steel and placed inside that building is this method sufficient to model that fluid structure interaction