Hello everyone,

I’m doin an analysis on a wind modal analysis. I have this problem that when I define the spectrum myself, the CRIT values does’t affect the result. Even when I don’t define them, still there will be the same result. However, in manuel it’s mentioned that without these values no spectrum will be calculated. So the problem is that I don’t know SOFiSTiK multiby the frequency values by which number to find the response on the spectrum.

You can find a part of the Teddy below, which is modified from the Teddy examples.

prog sofiload

lc 150 titl ‘Basic wind with Davenport coherences’

wind atmo 65 dy 1.0 ; WROU R1 0.005[m]

wpro #ZREF #UI TLON #TLON #TLAT #TVER LLON #LLON #LLAT #LVER

WSPE KARM LON 57 VER 58 CTYP DAV2 KUU 3 12 12 10 10 10 10 10 10

END

prog sofiload

LC 157 TYPE NONE CRIT #f CRI2 #f*5 TITL “Explicit modal factors longitudinal” $CRIT 1.0 CRI1 #f

WGEN 150 TLON

RESP WIND $SA 4 0 0 TB 70.7 TC 2 TD 5/6

FUNC T 2.83505E-05 0.000636082

5.6701E-05 0.001272157

8.50515E-05 0.001908222

0.000113402 0.002544269

0.000141753 0.003180294

0.000170103 0.00381629

…

EVAL WCOU 150 LEIG 11 1

The same way for the other two spectra.

Also when I want to use MODB the load case after that must be the load case of the first eigenvalue, because in that way it reduces the results but I don’t know how exactly it works?

Thank you in advance,