Guangzhou Steel News: damped steel structure than the selected seismic calculation is how much?

1, multi-case calculation of earthquake under a height of not more than 50m when desirable 0.04; height greater than 50m and less than 200m, preferable 0.03; the height of not less than 200m, should take 0.02.
2, when the eccentric portion of the support frame bear seismic overturning moment more than 50% of the total seismic overturning moment of the structure, its damping ratio (1) of this section corresponding increase in comparable 0.005.
3, under rare earthquake elastoplastic analysis, damping ratio 0.05 preferable. Guangzhou Steel