M.To apply a dynamic wind load per SP 20.13330.2016
To apply a SP 20.13330.2016 wind definition as a dynamic load to your structure, use the following procedure.
In order to perform dynamic wind load generation in STAAD.Pro you must previously define a static load case. The static load case could be any primary static load case which is defined before the Russian dynamic load case, including a static wind loading per the same code. This static load case will provide static load vector to the dynamic wind load module.
As the Russian dynamic wind
load component requires modal masses and eigen vectors to calculate the dynamic
wind load component at nodes, modal analysis must be performed before the
dynamic wind load definition. Therefore, you must also include a separate load
case for modal analysis with reference mass defined before the load case. See
G.17.3.2 Mass Modeling for details. Alternatively, if the mass loads are not
needed for use with other load cases (that is, a reference load case is not
needed for other loads), then you may define the mass loads within the dynamic
load case prior to the
WIND LOAD
command.