Load due to Velocity of Water 1

[AN1]

I have a question regarding the generally accepted practice of calculating forces on a stationary structural element due to water moving past it. Essentially, I have a cantilevered pipe affixed to a stationary block. The pipe will have instruments attached to it. I need to design the pipe and the connection of the pipe to the block.

 

[broekie]

From AASHTO section 3.18., the effect of flowing water on piers can be calculated by the formula:

Pavg = K * (Vavg)^2

where,

Pavg = average stream pressure in psf
K = 0.7 for circular piers (similar to your pipe?) or 1.4 for square-ended piers
Vavg = average velocity of water in feet per second

Hope that helps.

 

[HouseBoy]

broekie,
is there a limit on the width of the pier?
What if it's a wall?
Sorry, I don't have the ref material so maybe it's indicated there.
Thanks

 

[JackTrades]

Check out ASCE 7, Chapter 5. Also the FEMA, "Coastal Construction Manual," and the USACE's "Shore Protection Manual" can be found through a Google search on the titles.

 

[broekie]

No limits are listed in AASHTO.