Hi,
I am working on a Steel Structural Design Project in which I am using Chinese Sections like - RHS, Channel & Beam sections.
I have noticed that there are ambiguities in the the Section Properties of most of the Chinese profiles in Section Database of STAAD PRO. These section property doesn't match with the respective CHINESE STANDARDS.
For Example:
--In Channel Sections:
CH6.3 is a channel section as per Chinese Standard GB/T - 707-88. In Staad section database, the properties like B, D, tw, tf, Ix, Iy, Ct are matching with standard but Zx & Zy (Section Modulus) doesn't match i.e
by calculations it should be Zx = Ix / (D/2) = 50.8 cm^4 / (63/2) = 16.1 cm^3. However in Section Database, it is written as 19.6 cm^3.
My question is:
1. Should I change the values of required profiles from Section Database by myself OR these values are calculated in some other way for some software reasons. Please give clarity on this.
2. In RHS Sections - Almost all the Hollow section profiles are NOT as per Chinese Standards. So I create all required Sectional Properties by myself. Now here comes the problem, While creating a section, most of the time I do not have ALL THE REQUIRED parameters for the section database, like Ix (torsional Constant). As a result the design check will not proceed UNTIL all required parameters are inserted. So Please advise on this.
Thanks & Regards
Subodh