I have a 10" wall with vertical steel located in the middle. I am checking to see if it matters what side the contractor ties the horizontal steel. when calculating "d" for both locations, if the steel is located on the tension side, do I need to substract db for the vertical steel along with 1/2db of the horizontal steel or just ignore the vertical steel all together? thanks.
Eng-Tips is the largest engineering community on the Internet
Intelligent Work Forums for Engineering Professionals
-
Congratulations waross on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
calculating "d" in a r/c wall
- Thread starter arh13p
- Start date
I'm not sure I follow your question...
"if the steel is located on the tension side"...the steel is always on the tension side...thats why its there.
Your distance 'd' is from the outside of the compression face to the centre of your tension reinforcment...if you need to subtract the diameter of your vert. steel to figure out that distance then thats what you do.
As far as which side your horizontal steel is on...if its just there for temp/crack control then I really don't think it matters.
If your horizontal steel is there because of bending then I would suggest putting it on whatever side gives you the largest 'd'
"if the steel is located on the tension side"...the steel is always on the tension side...thats why its there.
Your distance 'd' is from the outside of the compression face to the centre of your tension reinforcment...if you need to subtract the diameter of your vert. steel to figure out that distance then thats what you do.
As far as which side your horizontal steel is on...if its just there for temp/crack control then I really don't think it matters.
If your horizontal steel is there because of bending then I would suggest putting it on whatever side gives you the largest 'd'
- Thread starter
- #3
msquared48
Structural
So you are spanning the wall horizontally rather than vertically?
Mike McCann
MMC Engineering
Mike McCann
MMC Engineering
- Thread starter
- #5
rowingengineer
Structural
make sure you have enough steel for shrinkage ect.
"A safe structure will be the one whose weakest link is never overloaded by the greatest force to which the structure is subjected” Petroski 1992
"A safe structure will be the one whose weakest link is never overloaded by the greatest force to which the structure is subjected” Petroski 1992
Lemony ,
.8 L is only fopr PT design and it requires a lot of PT steel at the tension face, not in the middle (indirect requirement as the test is is based on were pretensioned beams with strand at minimum cover to the tension face!)
For RC, use the smaller d if you want to cover bad installation, or the possibility of bending in both directions (eg swimming pool where soil pressure/external water pressuse could give tension on one face while internal water pressure could give tension on the other face)!
.8 L is only fopr PT design and it requires a lot of PT steel at the tension face, not in the middle (indirect requirement as the test is is based on were pretensioned beams with strand at minimum cover to the tension face!)
For RC, use the smaller d if you want to cover bad installation, or the possibility of bending in both directions (eg swimming pool where soil pressure/external water pressuse could give tension on one face while internal water pressure could give tension on the other face)!
I agree with BA. If this is a water retaining structure strength rarely controls the design. Crack control is far more important. Even if it were the controlling factro I would use the more conservative approach so that if the contractor does his own thing locating the bars we do not end up in a lengthy debate.
Brad
Brad
msquared48
Structural
No top?
OK, the 8 foot wide end walls can span horizontally, but not the 24 foot side walls. These need to be fixed at the base and span vertically with the steel placed so as to resist both the max soil load with no water, and the max soil load with the water. You will also need to use waterstops at the base of the wall.
Mike McCann
MMC Engineering
OK, the 8 foot wide end walls can span horizontally, but not the 24 foot side walls. These need to be fixed at the base and span vertically with the steel placed so as to resist both the max soil load with no water, and the max soil load with the water. You will also need to use waterstops at the base of the wall.
Mike McCann
MMC Engineering
You might find the following link helpful.
BA
BA
- Status
Similar threads
- Locked
- Question
- Locked
- Question
- Locked
- Question