Retaining Wall - Stem Reinforcement distribution 5

• Apr 30, 2020

• #2

hokie66

Structural

Jul 19, 2006

23,206

(12/4.5) x 1.0 = 2.6.

But I can't tell you why he didn't use #9 @ 5" = 2.40 in^2, greater than required.

 

Upvote 0 Downvote

• Apr 30, 2020

• Thread starter
• #3

XinLok

Civil/Environmental

Oct 22, 2019

77

Thank you for your reply.
I am confused how to distribute the reinforcement in the stem.

I draw this to show you how I am distributing the reinforcement:

Is this the correct or not the proper way?

The reinforcement is 2.2 in² per 1 foot, so if I use 2 # 9 per 1 foot, the reinforcement area is just 2 x 1 in² = 2 in².

 

Upvote 0 Downvote

• Apr 30, 2020

1
• #4

hokie66

Structural

Jul 19, 2006

23,206

Yes, what you show is, I think, 2 in^2 per foot. That's because your spacing is 6", not the 4.5" as the author suggested, or 5" per my post.

But this spacing is along the length of the wall, not across the width. Not sure what you are dimensioning as 12".

 

Upvote 0 Downvote

• Apr 30, 2020

1
• #5

r13

Civil/Environmental

Oct 26, 2019

5,988

Provide 2#10 @ 6" O.C. will eliminate the confusion. As = 2.54 in² > 2.26 in².

OP, try avoid decimal bar spacing, and provide number of bars can be spaced equally in a 12" strip [Bar Space = 12/(#Bars+1) = whole #].

 

Upvote 0 Downvote

• Apr 30, 2020

2
• #6

Lomarandil

Structural

Jun 10, 2014

1,917

Sometimes the bar spacing in one part of a retaining wall is driven by another part -- e.g. the toe or heel. Constructibility improves when the different spacings are multiples of each other.

----
just call me Lo.

 

Upvote 0 Downvote

• Apr 30, 2020

• #7

PEinc

Geotechnical

Dec 2, 2002

4,088

Or, a 4.5" spacing works out as the actual bar spacing for the wall section's actual length after you subtract the required rebar cover at each end of the wall section.

http://www.PeirceEngineering.com

 

Upvote 0 Downvote

• Apr 30, 2020

• Thread starter
• #8

XinLok

Civil/Environmental

Oct 22, 2019

77

Great people.
Thank you all

 

Upvote 0 Downvote

• Apr 30, 2020

1
• #9

Ganesh Persaud

Structural

Nov 21, 2018

94

Designing these, we do a 12 inch wide strip. After computing the Area per design strip as required, you could use the attached table to correlate bar size and spacing with its respective areas. The goal is to chose a bar size that’s locally available and Based on your judgement the spacing you want with that 12 inches so that we chose an area a little above the required so that the design satisfy the strength requirements.

See link. Hope this helps.

 

 https://files.engineering.com/getfile.aspx?folder=809f63cc-b6db-4d10-a25c-b1a23b259968&file=790B5741-FF79-4D93-B3F3-7FF0B7EB4B15.jpeg

Upvote 0 Downvote