INTAKE TOWER

[cdous]

A 30m high Intake Tower with a 6m internal diameter has attached to it a ventilation shaft. Buttresses have been placed radially on the external diameter, extending 5m. Two of them help to form-hols the ventilation shaft.
QUESTION: Is it wise to place an external concrete shell so as to include the buttresses so as to have better hydrodynamic response.The site has a pga of 0.40g

 

[racookpe1978]

Ya know ... It's a funny thing, but I've seen this same "buttressed intake tower" design problem three times. Seems to happen the same time each semester.