You can make a calculation to convert to an equivalent wind velocity using ASC 7; however, as far as converting all of the rest of the standard, I know of no easy way to do that. Every standard puts their own spin on the way wind loads are applied to a structure, and having some simple conversion is well beyond my capabilities. To convert to an equivalent wind speed you do the following:
NBCC gives a reference wind pressure, rather than a velocity. The tables in NBCC Appendix give values for 1 in 10 year and 1 in 50 year. NBCC Appendix C Defines a relationship between q and V:
q = 0.5 * (Air Density) * V^2 à V = (2*q / Air Density)^0.5
Air density = 1.2929 kg/m^3 (Average value)
The V in NBCC is defined as the mean hourly at a 10 m reference elevation, and ASCE 7 uses the 3 second gust at a 10 m reference elevation. In ASCE 7 the recurrence varies based upon Category for the structure, and NBCC gives only 10 yr and 50 yr recurrence. We offer a free tool to convert from one basis to another. For example, if we take Quebec City NBCC gives a 1 in 50 year pressure as 0.41 kPa.
V = (2*0.41*1000 / 1.2929)^0.5 = 25.2 m/s (Which is also provided in a lookup table in Table C-1)
Using our conversion tool, we can convert this to an ASCE 7-16 Category III wind speed as follows:
The equivalent wind speed is 51.51 m/s in ASCE 7-16 Category III.
Here is a link to download the free wind conversion tool shown above: http://www.mecaenterprises.com/downloads/software/mecawindconversioninstall.exe