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Spectrum according to local annex with EC 8‐1
red line is EC 8., blue is local annex horizontal, grey is vertical (z direction)
Made text file with points from spectrum and applied these in ROBOT:
Mass check:
sum of mass g = 9,81kN coef kG
DL1 688,43 1 70176,4DL2 80,37 1 8192,7DL3 100,5 1 10244,6LL1 398,74 0,8 32517,0
Sum mass 121130,7delta = ‐41,3 kg
from robot, modal Sum mass 121171,9
Results modal, 200 modes:
Cur. Mass UX, UY and UZ < 90% even <70,%, there are a lot of local vibration modes. My first conclusion is, this construction is not sensitive for seismic loads whit ag = 0,09g ( 0,88 m/s²) In order to get M<90% I should apply more modes. Is there a way to get rid of these local vibration modes? Or can I use these main modes (X mode 35, Y mode 2, Z mode 97) and assign them to the spectral cases: