Page 314 - 2018_IRC

WALL CONSTRUCTION

R608.6.3 Continuity of wall reinforcement between sto- splicing it with the bar in the other wall in accordance with
ries. Vertical reinforcement required by this section shall Section R608.5.4.3 and Figure R608.5.4(1).
be continuous between elements providing lateral support In required solid wall segments where the reduction
for the wall. Reinforcement in the wall of the story above factor for design strength, R , is based on the wall having
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shall be continuous with the reinforcement in the wall of horizontal and vertical shear reinforcement in accordance
the story below, or the foundation wall, if applicable. Lap with Section R608.7.2.2.1, horizontal wall reinforcement
splices, where required, shall comply with Section shall be terminated with a standard hook complying with
R608.5.4.3 and Figure R608.5.4(1). Where the above- Section R608.5.4.5 and Figure R608.5.4(3) or in a lap-
grade wall is supported by a monolithic slab-on-ground splice, except at corners where the reinforcement shall be
and footing, dowel bars with a size and spacing to match continuous as required.
the vertical above-grade concrete wall reinforcement shall
be embedded in the monolithic slab-on-ground and footing Exception: In lieu of bending horizontal reinforcement
the distance required to develop the dowel bar in tension at corners, separate bent reinforcing bars shall be per-
in accordance with Section R608.5.4.4 and Figure mitted provided that the bent bar is lap-spliced with the
R608.5.4(2) and lap-spliced with the above-grade wall horizontal reinforcement in both walls in accordance
reinforcement in accordance with Section R608.5.4.3 and with Section R608.5.4.3 and Figure R608.5.4(1).
Figure R608.5.4(1). R608.6.5 Location of reinforcement in wall. Except for
Where a construction joint in the wall is located below vertical reinforcement at the ends of required solid wall seg-
the level of the floor and less than the distance required to ments, which shall be located as required by Section
develop the bar in tension, the distance required to develop R608.7.2.2.2, the location of the vertical reinforcement
the bar in tension shall be measured from the top of the shall not vary from the center of the wall by more than the
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concrete below the joint. See Section R608.5.5. greater of 10 percent of the wall thickness and / -inch (10
8
mm). Horizontal and vertical reinforcement shall be located
Exception: Where reinforcement in the wall above to provide not less than the minimum cover required by Sec-
cannot be made continuous with the reinforcement in tion R608.5.4.1.
the wall below, the bottom of the reinforcement in the
wall above shall be terminated in accordance with one R608.7 Solid walls for resistance to lateral forces.
of the following: R608.7.1 Length of solid wall. Each exterior wall line in
1. Extend below the top of the floor the distance each story shall have a total length of solid wall required by
required to develop the bar in tension in accor- Section R608.7.1.1. A solid wall is a section of flat, waffle-
dance with Section R608.5.4.4 and Figure grid or screen-grid wall, extending the full story height with-
R608.5.4(2). out openings or penetrations, except those permitted by Sec-
tion R608.7.2. Solid wall segments that contribute to the
2. Lap-spliced accordance with Section total length of solid wall shall comply with Section
R608.5.4.3 and Figure R608.5.4(1) with a dowel R608.7.2.
bar that extends into the wall below the distance
required to develop the bar in tension in accor- R608.7.1.1 Length of solid wall for wind. Buildings
dance with Section R608.5.4.4 and Figure shall have solid walls in each exterior endwall line (the
R608.5.4(2). side of a building that is parallel to the span of the roof or
R608.6.4 Termination of reinforcement. Where indi- floor framing) and sidewall line (the side of a building
that is perpendicular to the span of the roof or floor fram-
cated in Items 1 through 3, vertical wall reinforcement in ing) to resist lateral in-plane wind forces. The site-appro-
the top-most story with concrete walls shall be terminated priate basic wind speed and exposure category shall be
with a 90-degree (1.57 rad) standard hook complying with used in Tables R608.7(1A) through (1C) to determine
Section R608.5.4.5 and Figure R608.5.4(3). the unreduced total length, UR, of solid wall required in
1. Vertical bars adjacent to door and window openings each exterior endwall line and sidewall line. For build-
required by Section R608.8.1.2. ings with a mean roof height of less than 35 feet (10 668
2. Vertical bars at the ends of required solid wall seg- mm), the unreduced values determined from Tables
ments (see Section R608.7.2.2.2). R608.7(1A) though (1C) are permitted to be reduced by
multiplying by the applicable factor, R , from Table
1
3. Vertical bars (other than end bars, see Item 2) used as R608.7(2); however, reduced values shall be not less
shear reinforcement in required solid wall segments than the minimum values in Tables R608.7(1A) through
where the reduction factor for design strength, R , (1C). Where the floor-to-ceiling height of a story is less
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used is based on the wall having horizontal and ver- than 10 feet (3048 mm), the unreduced values deter-
tical shear reinforcement (see Section R608.7.2.2.3). mined from Tables R608.7(1A) through (1C), including
The bar extension of the hook shall be oriented parallel minimum values, are permitted to be reduced by multi-
to the horizontal wall reinforcement and be within 4 inches plying by the applicable factor, R , from Table
2
(102 mm) of the top of the wall. R608.7(3). To account for different design strengths than
assumed in determining the values in Tables R608.7(1A)
Horizontal reinforcement shall be continuous around
the building corners by bending one of the bars and lap- through (1C), the unreduced lengths determined from
Tables R608.7(1A) through (1C), including minimum

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