Reinforced Concrete Stormwater Pits

Question

Reinforced Concrete Stormwater Pits

ShawThing (Structural)

(OP)

17 Nov 19 22:49

Hi All
Putting strength requirements aside just wanted to confirm or otherwise that wall for reinforced concrete stormwater pits should be designed to satisfy the requirements of AS3600 Clause 11.7.2. These walls would typically have exposure classifications of B1 or B2 resulting in horizontal reinforcement ratio of 0.006. The reason for the question is that I see pits with mesh used in the walls and that they probably wouldn't meet this requirement for a minimum 150 thick wall with one layer of reinforcement and wanted to check if there was something else I was missing.
Thanks.

rowingengineer (Structural) · Answer 1 · 2019-11-18 10:18:48

There is a Queensland main road doc on precast pits, probably worth a review. Tn23 precast pits.

http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."

ShawThing (Structural) · Answer 2 · 2019-11-18 22:05:39

Thanks rowingengineer
I did come across that document and at the time was concerned with the strength design criteria and must have skipped over the relevant section in relation to serviceability.
Cheers

rowingengineer (Structural) · Answer 3 · 2019-11-18 23:11:37

I think the main point is that they treat it as two way spanning slabs for the walls.

http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."

RayGon (Structural) · Answer 4 · 2019-11-30 15:21:57

There are pits used by RMS without reinforcements at all.

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Reinforced Concrete Stormwater Pits