OBC 2006 › Division B
4.1.8.9.
Version 0 — in force 31 December 2006
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- Edition
- OBC_2006
- Division
- B
- Provision
- 4.1.8.9.
- Version
- v0
(1) This Regulation comes into force on December 31, 2006.
Read directly from the regulation's own commencement section.
O. Reg. 350/06 · commencement 2.2.1.1(1)
This version stayed in force until the next edition replaced it. What follows is that edition’s base regulation’s commencement — the takeover that ended this one.
(1) Subject to Sentences (2) and (3), this Regulation comes into force on January 1, 2014.
Read directly from the regulation's own commencement section.
O. Reg. 332/12 · commencement 4.4.1.1(1)
This looks wrong
Tell us what is wrong and we will verify & correct our mapping.
- Edition
- OBC_2006
- Division
- B
- Provision
- 4.1.8.9.
- Version
- v0
(1) This Regulation comes into force on December 31, 2006.
Read directly from the regulation's own commencement section.
O. Reg. 350/06 · commencement 2.2.1.1(1)
This version stayed in force until the next edition replaced it. What follows is that edition’s base regulation’s commencement — the takeover that ended this one.
(1) Subject to Sentences (2) and (3), this Regulation comes into force on January 1, 2014.
Read directly from the regulation's own commencement section.
O. Reg. 332/12 · commencement 4.4.1.1(1)
Provenance
New in this edition — no OBC 1997 predecessor
Base · O. Reg. 350/06 · ext← current
Original — base regulation
OBC 2012 · continues as 4.1.8.9. — Pro
4.1.8.9. — SFRS Force Reduction Factors, System Overstrength Factors, and General Restrictions
(1) The values of Rd and Ro and the corresponding system restrictions shall conform to Table 4.1.8.9. and the requirements of this Subsection.
(2) When a particular va1ue of Rd is required by this Article, the corresponding Ro shall be used.
(3) For combinations of different types of SFRS acting in the same direction in the same storey, RdRo shall be taken as the lowest value of RdRo corresponding to these systems.
(4) For vertical variations of RdRo, excluding penthouses whose weight is less than 10% of the level below, the value of RdRo used in the design of any storey shall be less than or equal to the lowest value of RdRo used in the given direction for the storeys above, and the requirements of Sentence 4.1.8.15.(3) must be satisfied.
(5) If it can be demonstrated through testing, research and analysis that the seismic performance of a structural system is at least equivalent to one of the types of SFRS mentioned in Table 4.1.8.9., then such a structural system will qualify for values of Rd and Ro corresponding to the equivalent type in that Table.
Editor's note
As filed in O. Reg. 350/06, the notes to Table 4.1.8.9. show the headnote in bold and each footnote marker as a superscript followed by an en space; the e-Laws consolidation removes the headnote bold and removes the space after each marker, gluing it to the following text. The footnote text is identical, and this map preserves the as-filed rendering.
Text · e-Laws consolidated snapshot
Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 | Column 7 | Column 8 |
Restrictions(2) | |||||||
Type of SFRS | Rd | Ro | Cases Where IEFaSa(0.2) | Cases Where IEFvSa(1.0) | |||
<0.2 | ≥0.2 to <0.35 | ≥0.35 to ≤0.75 | >0.75 | >0.3 | |||
Steel Structures Designed and Detailed According to CAN/CSA-S16 | |||||||
Ductile moment-resisting frames | 5.0 | 1.5 | NL | NL | NL | NL | NL |
Moderately ductile moment-resisting frames | 3.5 | 1.5 | NL | NL | NL | NL | NL |
Limited ductility moment-resisting frames | 2.0 | 1.3 | NL | NL | 60 | 30 | 30 |
Moderately ductile concentrically braced frames | |||||||
Non-chevron braces | 3.0 | 1.3 | NL | NL | 40 | 40 | 40 |
Chevron braces | 3.0 | 1.3 | NL | NL | 40 | 40 | 40 |
Tension only braces | 3.0 | 1.3 | NL | NL | 20 | 20 | 20 |
Limited ductility concentrically braced frames | |||||||
Non-chevron braces | 2.0 | 1.3 | NL | NL | 60 | 60 | 60 |
Chevron braces | 2.0 | 1.3 | NL | NL | 60 | 60 | 60 |
Tension only braces | 2.0 | 1.3 | NL | NL | 40 | 40 | 40 |
Ductile eccentrically braced frames | 4.0 | 1.5 | NL | NL | NL | NL | NL |
Ductile frame plate shear walls | 5.0 | 1.6 | NL | NL | NL | NL | NL |
Moderately ductile plate shear walls | 2 | 1.5 | NL | NL | 60 | 60 | 60 |
Conventional construction of moment frames, braced frames or shear walls | 1.5 | 1.3 | NL | NL | 15 | 15 | 15 |
Other steel SFRS(s) not defined above | 1.0 | 1.0 | 15 | 15 | NP | NP | NP |
Concrete Structures Designed and Detailed According to CSA A23.3 | |||||||
Ductile moment-resisting frames | 4.0 | 1.7 | NL | NL | NL | NL | NL |
Moderately ductile moment-resisting frames | 2.5 | 1.4 | NL | NL | 60 | 40 | 40 |
Ductile coupled walls | 4.0 | 1.7 | NL | NL | NL | NL | NL |
Ductile partially coupled walls | 3.5 | 1.7 | NL | NL | NL | NL | NL |
Ductile shear walls | 3.5 | 1.6 | NL | NL | NL | NL | NL |
Moderately ductile shear walls | 2.0 | 1.4 | NL | NL | NL | 60 | 60 |
Conventional construction Moment-resisting frames | 1.5 | 1.3 | NL | NL | 15 | NP | NP |
Shear walls | 1.5 | 1.3 | NL | NL | 40 | 30 | 30 |
Other concrete SFRS(s) not listed above | 1.0 | 1.0 | 15 | 15 | NP | NP | NP |
Timber Structures Designed and Detailed According to CAN/CSA-O86 | |||||||
Shear walls | |||||||
Nailed shear walls: wood-based panel | 3.0 | 1.7 | NL | NL | 30 | 20 | 20 |
Shear walls: wood-based and gypsum panels in combination | 2.0 | 1.7 | NL | NL | 20 | 20 | 20 |
Braced or moment-resisting frames with ductile connections | |||||||
Moderately ductile | 2.0 | 1.5 | NL | NL | 20 | 20 | 20 |
Limited ductility | 1.5 | 1.5 | NL | NL | 15 | 15 | 15 |
Other wood-or gypsum-based SFRS(s) not listed above | 1.0 | 1.0 | 15 | 15 | NP | NP | NP |
Masonry Structures Designed and Detailed According to CSA S304.1 | |||||||
Moderately ductile shear walls | 2.0 | 1.5 | NL | NL | 60 | 40 | 40 |
Limited ductility shear walls | 1.5 | 1.5 | NL | NL | 40 | 30 | 30 |
Conventional construction | |||||||
Shear walls | 1.5 | 1.5 | NL | 60 | 30 | 15 | 15 |
Moment-resisting frames | 1.5 | 1.5 | NL | 30 | NP | NP | NP |
Unreinforced masonry | 1.0 | 1.0 | 30 | 15 | NP | NP | NP |
Other masonry SFRS(s) not listed above | 1.0 | 1.0 | 15 | NP | NP | NP | NP |
Notes to Table 4.1.8.9.:
(1)See Article 4.1.8.10.
(2) NP = system is not permitted.
NL = system is permitted and not limited in height as an SFRS; height may be limited in other Parts of the Code.
Numbers in Columns 4 to 8 are maximum height limits in m.
The most stringent requirement governs.
Provenance
New in this edition — no OBC 1997 predecessor
Base · O. Reg. 350/06 · ext← current
Original — base regulation
OBC 2012 · continues as 4.1.8.9. — Pro