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Loading and Load Cases
The load cases which normally dictate the results are:-
1.Long Term
Designing for the effect of all long term loads (all loads which will be present throughout the life of the building) i.e.:
2.Medium Term

Taking into account loads which will be present for a period of weeks or months on the building i.e: - All the long term loads Plus - snow loads
3.Short Term

For loads which may occur for minutes or hours during the buildings life i.e:
-All the long term loads Plus - Snow loads Plus - The man load on the bottom chord
It will be seen that this load case will, in fact, be a multiple load case as the man load must be checked at every bottom chord bay and node position. Note the man load on top and bottom chords are in separate load cases.