vincentpa
Structural
- Nov 9, 2005
- 223
I am designing a 180' diameter concrete clarifier and I have some problems to work out. Does anyone design concrete clarifiers out there?
1) I read ACI 3502-04 and it suggests using a membrane slab with no construction joints. I think that is impossible for a 180 diameter clarifier. That is 472 yars of concrete. I would prefer to use radial construction joints at 30' on center with an expansion joint at radius = 60'.
2) My other problem is vertical construction joints in the wall. Do I weaken the plane at the construction joint by decreasing the section (sawing or forming a joint), seal it, and provide a water stop or do I just provide a waterstop without weakening the plane at the construction joint? Is it better to use a vertical key or dowels at the construction joint to trasfer the out of plane shear?
3) How do I calculate the base shear due to thermal expansion outwards so the wall does not slide off of the slab?
1) I read ACI 3502-04 and it suggests using a membrane slab with no construction joints. I think that is impossible for a 180 diameter clarifier. That is 472 yars of concrete. I would prefer to use radial construction joints at 30' on center with an expansion joint at radius = 60'.
2) My other problem is vertical construction joints in the wall. Do I weaken the plane at the construction joint by decreasing the section (sawing or forming a joint), seal it, and provide a water stop or do I just provide a waterstop without weakening the plane at the construction joint? Is it better to use a vertical key or dowels at the construction joint to trasfer the out of plane shear?
3) How do I calculate the base shear due to thermal expansion outwards so the wall does not slide off of the slab?
