3.1.4.6.(3)ATTRIBUTION:
Most technical provisions of the BC Fire Code describe how the code’s objectives and functional statements are achieved. However, some provisions, like this one, do not relate directly to a code objective. The following analysis is provided to assist in understanding of the provision.
APPLICATION:
Minimum thickness of splice plates used for splicing
roof arches supported on the tops of walls or abutments, roof trusses, roof
beams and roof girders in heavy timber construction, in buildings described in Sentence
1.3.3.2.(1) of Division A, where:
- this type of construction is specifically mentioned in this Part, or
- combustible construction is permitted and is not required to have a fire-resistance rating more than 45 min, as stated in Sentence 3.1.4.5.(1).
This also applies to buildings to which Part 9 applies [see Sentence
1.3.3.3.(1) of Division A for application
of Part 9] where heavy timber construction is considered to have a 45 min fire-resistance rating, as stated in Sentence
9.10.6.2.(1).
INTENT:
To exempt splice plates for roof arches from the application
of Sentence
3.1.4.6.(2), which would otherwise require larger dimensions,
if certain conditions are met that limit the probability of premature structural
failure of the heavy timber construction during a fire.