OBC 2006 › Division B

4.1.3.2.

Version 1 — in force 2 April 2007

In force · amended

Verified · covered Verified against the 2007-04-02–2007-06-30 consolidation, whose range covers the query date. How to read this

In force · amended

Verified · covered Verified against the 2007-04-02–2007-06-30 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · merged from 4.1.1.7. — Pro

OBC 1997 · continues from 4.1.3.2. — Pro

Base · O. Reg. 350/06 · ext v0 →

O. Reg. 137/07, cl. 29 · ext ← current

In force 2007-04-02

OBC 2012 · continues as 4.1.3.2. — Pro

4.1.3.2. — Strength and Stability

(1) A building and its structural components shall be designed to have sufficient strength and stability so that the factored resistance, ΦR, is greater than or equal to the effect of factored loads, which shall be determined in accordance with Sentence (2).

(2) The effect of factored loads for a building or structural component shall be determined in accordance with the load combination cases listed in Table 4.1.3.2. and the requirements of this Article, the applicable combination being that which results in the most critical effect.

(3) Where the effects due to lateral earth pressure, H, restraint effects from pre-stress, P, and imposed deformation, T, affect the structural safety, they shall be taken into account in the calculations, with load factors of 1.5, 1.0 and 1.25 assigned to H, P and T respectively.

(4) Except as provided in Sentence 4.1.8.16.(1), the counteracting factored dead load, 0.9D in load combination cases 2, 3 and 4 and 1.0D in load combination case 5, shall be used when the dead load acts to resist overturning, uplift, sliding, failure due to stress reversal, and to determine anchorage requirements and the factored resistance of members.

(5) The principal-load factor 1.5 for live load, L, in Table 4.1.3.2. may be reduced to 1.25 for liquids in tanks.

(6) The companion-load factor 0.5 for live load, L, in Table 4.1.3.2. shall be increased to 1.0 for storage areas and for equipment areas and service rooms referred to in Table 4.1.5.3.v1

(7) The load factor 1.25 for dead load, D, in Table 4.1.3.2. for soil, superimposed earth, plants and trees shall be increased to 1.5, except that when the soil depth exceeds 1.2 m, the factor may be reduced to 1 + 0.6/h_s but not less than 1.25, where h_s is the depth of soil in metres supported by the structure.

(8) Earthquake load, E, in load combination case 5 of Table 4.1.3.2. includes horizontal earth pressure due to earthquake determined in accordance with Sentence 4.1.8.16.(4).

(9) Provision shall be made to ensure adequate stability of the structure as a whole and adequate lateral, torsional and local stability of all structural parts.

(10) Sway effects produced by vertical loads acting on the structure in its displaced configuration shall be taken into account in the design of buildings and their structural members.

Text · e-Laws consolidated snapshot

Table 4.1.3.2. Load Combinations for Ultimate Limit States Forming Part of Sentence 4.1.3.2.(2)


Column 1	Column 2	Column 3
Case	Load Combination⁽¹⁾
Case	Principal Loads	Companion Loads
1	1.4D
2	(1.25D⁽²⁾ or 0.9D⁽³⁾) +1.5L⁽⁴⁾	0.5S⁽⁵⁾ or 0.4W
3	(1.25D⁽²⁾ or 0.9D⁽³⁾) +1.5S	0.5L⁽⁵⁾⁽⁶⁾ or 0.4W
4	(1.25D⁽²⁾ or 0.9D⁽³⁾) +1.4W	0.5L⁽⁶⁾ or 0.5S
5	1.0D⁽³⁾ + 1.0E⁽⁷⁾	0.5L⁽⁵⁾⁽⁶⁾ + 0.25S⁽⁵⁾

Notes to Table 4.1.3.2.:

⁽¹⁾See Sentences 4.1.3.2.(2) and (3).

⁽²⁾See Sentence 4.1.3.2.(7).

⁽³⁾See Sentence 4.1.3.2.(4).

⁽⁴⁾See Sentence 4.1.3.2.(5).

⁽⁵⁾See Article 4.1.5.5.

⁽⁶⁾See Sentence 4.1.3.2.(6).

⁽⁷⁾See Sentence 4.1.3.2.(8).