I would like to open a discussion about seismic analysis based on the Canadian National building code section 4.1.8.18.

I am curious how others look at the following:

1) Par 4.1.8.5 Value of IE in regard to fluid categories D, N, M. I would use (1, 1.3, 1.5)

2) Par. 4.1.8.18 - 7a) The code specifies using no friction; if some use a reduced friction factor, I am interested in code justification.

3) Par. 4.1.8.18 - 6) The code appears to request only horizontal loading. If some are using a combination of vertical and horizontal, with this method, I am interested to know where this is coming from.