Clarification on NBC 2005 - Rd Ro
Clarification on NBC 2005 - Rd Ro
(OP)
In the NBC it is unclear to me what to increase the seismic loads by....do you multiply the seismic loads by Rd (Ductility-Related Force Modification Factors) or by Ro (Overstrength-Related Force Modification Factors, or do you multiply Ro and Rd together and use that??
The wording in the NBC is confusing!
The wording in the NBC is confusing!






RE: Clarification on NBC 2005 - Rd Ro
Then when you are designing critical items (connections and such), you would multiple by Ro. That sounds equivalent to the Omega overstrength factor in the US codes.
RE: Clarification on NBC 2005 - Rd Ro
In the NBC section 4.1.8.15(5) reads, "the design forces need not exceed the forces determined in accordance with Sentence 4.1.8.7(1), multiplied by RdRo."
Where sentence 4.1.8.7(1) just describes whether to use the static equivalent method or a dynamic anaylsis for seismic forces.
RE: Clarification on NBC 2005 - Rd Ro
RE: Clarification on NBC 2005 - Rd Ro