I recommend you (and not only you) the Sam Manik’s "Load Cases" document in the "Temperature Inputting" topic just bellow this one...by a strange coincidence has been "reactivated" by a people not speaking English…in the same note you can say "Terima kasih\ ‘makasih\ - or better- Thank you, Sam Manik"…

About your concern...both "static earthquake" and "static wind" are approximations of dynamic phenomena. For earthquake it’s a little bit more evident this fact (especially for people that have experienced a strong earthquake). About the wind...Tacoma Narrows Bridge has collapsed because aerodynamic flutter at a wind of 42mph; after the collapse, new mathematical theories of vibration, aerodynamics, wave phenomena, and harmonics have been applied to bridge design.