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How to set crane loads across cross-section of the building in PC LIRA?

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How to set crane loads across cross-section of the building in PC LIRA?
 
Tell me please, how properly set crane load cases for three-span frame? Each span has overhead traveling crane. That's how I propose to set crane load cases:
1.     First span –Dmax on the left support, Dmin on the right one.
2.     First span –Dmin on the left support, Dmax on the right one.
3.     First span – brake (alternating) on the left support.
4.     First span – brake (alternating) on the right support.
5.     6. Duplicate 3 and 4 load case, because brake load case could be set as accompanying just once.
A total of 6 load cases for one span, therefore it will be 3 for 18, will not it?
By the way, what is the difference between a crane, brake and short-term types of load cases in PC LIRA? Is the difference in duration of action? Indeed, in accordance to ŃĎ crane and brake loads relate to short-term loads, is not it? If, for example, set crane and brake load as short-term load-case, then it is possible not to set 5 and 6 load case, because short-term load case can be set several times as accompanying.

Is it correct to apply PRB (perfectly ridged body) for ledges modelling of two-member column, trusses relay with eccentricity and application of crane load? Alternatively, should it be done using offsets for bars?
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