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In SAP2000, when adding joint mass loads converted from the structure dead
loads (gravity loads), do you add them as negative mass loads (downward
direction)? I was not sure if mass loads have a positive or negative value.
As dead weight, the loads are acting in the downward direction (gravity).
But when you convert them to a mass, do you still use the negative sign to
indicate a downward direction?

Gina T. Gobo, E.I.T.
Structural Engineering
DLR Group
Ph. 206.461.6000
Fax 206.461.6049