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Hi everyone, Does anybody know the difference between driving a conventional (regular reinforcement) pre-cast pile and pre-stressed pile, the conventional pile cross section is 10" x 10" and the pre -stressed is 12" x 12" (if there is a difference). Do we need different type of equipment to...

Does the pile loose any of it's capacity due to cutting the strands off, if that is an option?

Hi every one, Does anyone know what the effect of cutting the pre-stressed strands to adjust the top pile elevation and weather the epoxy dowels to connect the pile to the pile cap is better than exposing the strands during the cut off procedure and tie them to the pile cap reinforcement, if...

Is that also can be applied on precast circular tank, since it is covered by ACI 350 scope - Chapter 1 ?

No I want to know for future reviews what is the minimum wall thickness & wall reinforcement required by ACI 350 code?

Hi everyone, I am trying to follow ACI 350 to design a shallow grease trap tank (about 9 feet deep with about 6 feet of liquid) but I am not sure what would be the minimum walls thickness and the minimum wall reinforcement according to ACI 350. Can you please help Thanks

It is not a manhole, it a grease trap that retains liquid all the time. The bottom section of the structure that retains the liquid is monolithic.

Hi, According to ACI 350-06 - 1.1.1.1, ACI 350 is not covering precast structures covered by ASTM except precast circular tanks. AS per Chapter 14 , the minimum wall thickness is 12" if the wall is 10 feet or more in contact with liquid but for conventionally cast in place walls. I just...

Hi everyone, I am the review engineer of a new sewer pump station project which has a 23' deep & 10' diameter grease trap. The contractor has submitted a shop drawing for the grease trap (copy attached) with a monolithic base and solid rings on top, the submitted shop drawing shows 4" thick...

Attachments have been reattached here, please check the treat attachments.http://files.engineering.com/getfile.aspx?folder=e17fb07e-f23e-4319-a913-4e189171ede7&file=Grease_Trap_Design_Calc.pdf

The specification has called to use ACI 350 for sanitary structures. ASTM C478 is also listed in the precast section of the specification but for precast manholes and the project engineer has refereed to ASTM C1613 because the grease trap has a 6' liquid at the bottom section and it is not a...

ASTM 1613 & ASTM 890

Hi everyone, I am the review engineer of a new sewer pump station project which has a 23' deep & 10' diameter grease trap. The contractor has submitted a shop drawing for the grease trap (copy attached) with a monolithic base and solid rings on top, the submitted shop drawing shows 4" thick...

Attached is a photo of one of the supports that they try to keep it without replacement but they have agreed to replace the support that has two channels on top of each other(shown on the previous...

Hi everyone, I have designed a T steel supports for overhead duct line. The contractor have used channels between the T support and the pipe support (photo attached) to make up the difference in elevation due to some short T supports. The contractor did not get a field adjustment approval and...

Hi everyone, I am using shotcrete mix to repair slab ceiling and walls of wastewater tank. I have proposed the following scope of work for the tanks repair: SCOPE OF WORK 1.Remove of deteriorated concrete cover throughout the tank ceiling and upper section of the walls up to at least 1 foot...

I have found that the tank design engineer who used the software, has removed the 1.7 load factor required by ACI 350, that is why, he came up with the same reinforcement for higher water depth. I just wanted to learn how to use the software so I can compare the design using the tables with...

Hi Everyone, I need help using Autodesk Robot structural analysis software to design multi- cell tank. I would appreciate if you can explain the steps of using the software to design the concrete tank. Thank You so much!

Hi everyone, I am reviewing a modification to wastewater existing tank by adding a dividing wall, the tank is 29' x 29' 18' high and the dividing wall is 18' from the side wall. The structural engineer submitted a structural calculation based on 11.5' water depth using PCA tables using...

Hi everyone, I am a reviewing a tank design calculation submitted by a NYS Structural Engineer. I do not agree with the calculation and I want to get your opinion about some of the assumptions in the structural calculation report. 1. The report considered ACI 350 just a recommendation and...