Francis Vineyard
Registered User
In 2009 the concrete tables R404.1.2(2) through (7) now says Maximum Unsupported Wall Height; how is it unsupported?
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Unsupported Wall?
- Thread starter Francis Vineyard
- Start date
steveray
SAWHORSE
Without looking....Aren't they talking about the difference between interior and exterior grade heights?
Sifu
SAWHORSE
- Joined
- Sep 3, 2011
- Messages
- 2,809
A wall is typically supported at the bottom by a slab and at the top by construction of a floor system.
The 2006 commentary:
"Lateral support at the top and bottom of the foundation
wall must be provided to resist the lateral loads imposed
on the foundation wall.
The prescriptive bottom support is provided by a
basement floor.
The top support is provided by connections and anchor
bolts as prescribed in Tables R404.1 (1) and (2)."
The 2006 commentary:
"Lateral support at the top and bottom of the foundation
wall must be provided to resist the lateral loads imposed
on the foundation wall.
The prescriptive bottom support is provided by a
basement floor.
The top support is provided by connections and anchor
bolts as prescribed in Tables R404.1 (1) and (2)."
Francis Vineyard
Registered User
When to use Tables R404.1.2(2) through R404.1.2(7) or Table R404.1.2(8) is based on where the vertical rebar is placed; section R404.1.2.3.7.2 reads identical to the commentary for section R404.1.2.2;
“Tables R404.1.2(2) through R404.1.2(7) require the vertical steel to be located at the centerline of the wall. Table R404.1.2(8) requires the steel to be located with a maximum cover of 1¼ inches from the inside face of the wall. Tables R404.1.2(2) through R404.1.2(8) are based on reinforcing bars of Grade 60. Table R404.1.2(9) provides for use of an alternate grade of steel and bar size."
“Unsupported Wall Height” is simply the distance between the lateral support at the bottom and top of the wall. Table R404.1.2(8) footnote “e” mentions unsupported height whereas the other tables footnote “d” is a given from the table referenced.
May an expert add; confirm or deny my presumption.
“Tables R404.1.2(2) through R404.1.2(7) require the vertical steel to be located at the centerline of the wall. Table R404.1.2(8) requires the steel to be located with a maximum cover of 1¼ inches from the inside face of the wall. Tables R404.1.2(2) through R404.1.2(8) are based on reinforcing bars of Grade 60. Table R404.1.2(9) provides for use of an alternate grade of steel and bar size."
“Unsupported Wall Height” is simply the distance between the lateral support at the bottom and top of the wall. Table R404.1.2(8) footnote “e” mentions unsupported height whereas the other tables footnote “d” is a given from the table referenced.
May an expert add; confirm or deny my presumption.
steveray
SAWHORSE
I was thinking unbalanced backfill.....sorry....I think I wouuld agree with you FV..
Daddy-0-
Moderator
Don't have my book but there is a section for max. unbalanced fill that is used for limiting the amount of fill you can place BEFORE the wall is laterally braced.(floor slab and floor joists.)