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LRFD Seismic Provisions

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Happy New Year!

Can any body provide some reference on using the following two load
combinations in steel (LRFD) Design:

1.2D + 0.5L +/-  0.4RE
0.9D +/- 0.4RE

where R is the Structural Response Coeffiecient, and E is the seismic service
load. The LRFD Seismic Design Provisions for Steel Building state that the
above two equations shall be used "as necessary". Can you provide some
guidance as to when these are necessary.  They are not mentioned with the
load combinations in ASCE 7.

Thank You.