When reviewing the maximum displacement of a mode shape, expect that the normalized maximum displacement will equal 1.0. Instead, it equals some random number less than 0.5. Why?
AutoPIPE outputs mass-normalized modal shape amplitudes. I.e. the mode shape PHI is divided by
PHIT*M*PHI = modal mass
where:
PHI = mode shape vector
M = mass matrix
"Mode Shape" sub report
Bentley AutoPIPE