This method uses different load items within the load case to define the weights for use with that specific response spectrum. Combinations of selfweight, joint weights, member weights, element weights, and floor weights can defined prior to the response spectrum parameters.

seismic-weights =
SELFWEIGHT (f1)
JOINT WEIGHT
joint-list WEIGHT w
MEMBER WEIGHT
member-list { UNI v1 v2 v3 | CON v4 v5 }
ELEMENT WEIGHT
plate-list PRESS p1
FLOOR WEIGHT
floor-weight-spec
ONEWAY WEIGHT
oneway-weight-spec
REFERENCE LOAD { X | Y | Z }
Ri1 f2

SELFWEIGHT { X | Y | Z } f1
JOINT LOADS
joint-loads
MEMBER LOADS
member-loads