Question on an example of designing retaining wall
Question on an example of designing retaining wall
(OP)
with the attached file
I got some problem in the reinforcement section
In page 3
For the reinforcement of heel section, I dont understand the equation that calculates the design moment at point C
And I dont know where did the 51.8 appear in the same equation
I got some problem in the reinforcement section
In page 3
For the reinforcement of heel section, I dont understand the equation that calculates the design moment at point C
And I dont know where did the 51.8 appear in the same equation






RE: Question on an example of designing retaining wall
RE: Question on an example of designing retaining wall
1. Contribution of the soil weight
2. Contribution of the concrete base weight
3. Contribution of p2 over 2.9m length
4. Contribution of varying pressure p3 - p2 over 2.9m length
51.8 is p3 - p2
BA
RE: Question on an example of designing retaining wall
Mc = 385.7*2.9/2 + 2.9*38.4*1.4*1.45/4 - 91*2.9*2.9/2 - 51.8*2.9*2.9/2/3
385.7*2.9/2 = M clockwise due to down force on right
2.9*38.4*1.4*1.45/4 = can't figure this term out, but lots of recognizable values in there
91*2.9*2.9/2 = M counter clockwise due to uniform upwards soil pressure on right, magnitude is p2 = 91
51.8*2.9*2.9/2/3 = M counter clockwise due to triangular soil pressure up on right, magnitude p3-p2 = 51.8 on left end (@ C) and 0 on right end
The diagram is a little confusing.
p1 is on the far left, p3 is @ c and p2 is on the far right.
Couldn't figure out the one term, you'll have to do that.
I won't be responding further because I'm not on here often, FYI.
Hope this helps!
RE: Question on an example of designing retaining wall
That's the moment due to the weight of the base x 1.4 (load factor)
The total base weight is 38.4 and total width is 4.0, so weight to the right of C is 38.4 x 2.9/4.0
Factored moment about C = (38.4 x 2.9/4.0) x 2.9/2 x 1.4
Note that the load factor is not applied to the anti-clockwise moments due to the soil pressure, since that would reduce the nett moment at C
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/