Why is the effect of the 1st load step with spectrum 1 being lost in the Multi-Point Response Spectrum (MPRS) input below?
/solu
antyp,spectrum
spopt,mprs
PSDFRQ
PSDUNIT,1,ACCG,386.4
PSDFRQ,1,,1,3,4,100,1000
PSDVAL,1,2,2,2,2,2
DMPRAT,0.02 ! 2% konstant dämpning
D,2,Uy,1,,
ALLSEL,aLL,aLL
PFACT,1,BASE,
PSDFRQ
PSDUNIT,2,ACCG,386.4
PSDFRQ,2,,1,3,4,100,1000
PSDVAL,2,2,2,2,2,2
DMPRAT,0.02 ! 2% konstant dämpning
d,2,uy,0
d,1,uy,1
PFACT,2,BASE,
SRSS
SOLVE
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The effect of the first load step with spectrum 1 is lost because a blank PSDFRQ command is being issued before the second spectrum is input. Reinitializing the frequency list is only necessary when specifying new values for the same table and not for specifying a table with a new number as is being done here. |
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