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UBC seismic connection

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   UBC 97 section 2213.8.3.1 states that bracing connections must be
designed for the least of three (3) different cases.  One of the cases is
"The maximum force that can be transferred to the brace by the system".  It
has been suggested that the only way to obtain this value is thru a static
push-over analysis or a non-linear time history analysis.
   Could someone explain (to a person not experienced in high-seismic design
requirements) the definition of "maximum system force transferred to the
brace" and how this value is normally obtained?
   The building is Seismic Zone 3, Soil Profile SD, Importance 1.0, Ca 0.36,
Cv 0.54, concentrically braced steel frame.

Thank you in advance for your input.
William Pulyer P.E.