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Normally, in a structural model, we only model elements of a structure that contribute to gravity/ vertical or lateral stiffness of a structure. Concrete insulated panels, unless load bearing should be modeled. If it is load bearing, then most likely you are not working on a frame structure. Cheers.

It tells you about frequency of different modes in different units(Units as in Hz and radians). Frequency can be used to get time period. Time period is an important parameter and you can use it for a lot of things. Since people do computer analysis & design together, like you are doing now, so the software does everything for you. Mostly, time period in useful in knowing the stiffness of memeber and is related to forces it will attract under seismic and wind in case of non-static analysis.

General Basement Wall Design. take a unit strip, if your basement wall has a slab on top, you can treat it as a propped cantilever with Ko (Coefficient of Static earth pressure: as wall cant move to Ka state for failure).. If cantilever, design for lateral loading with Ka(Coefficient of active earth pressure). Significant Vertical Load If you have significant vertical load design it as a beam column and use ACI wall provision for min/ max reinforcement.