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Free wall with a height of 15 m

Free wall with a height of 15 m

Free wall with a height of 15 m

(OP)
Hello,

we have to design a free wall with a height of 15 m.  There are no ground pressures on the wall, only the wind.  At 2 m of the wall, there is a sewer (depth 2 m, radius 0.5m).  The ground at the site is bad (soft clays,... in the first 6 m, then loosely packed sand for 3.5 m, then a good layer of sand of 3 m).  The wall is asides the railroad (vibrations).

This wall is about 1 km long.  It is in a coastal area, not much buildings in the area, so the wind can be quite strong (design value approx. 1.5 kN/m²).

I am thinking of using a type of berlinerwall, where we vibrate steel H-beams (e.g. HEB-300) in the ground every 4 or 5 m.  Between these beams we can place prefabricated concrete plates.  

Of course, the people I work for want a cheap design.  Are there according to you guys cheaper methods of constructing this wall?  Do you see problems in a design as a berlinerwall?

Thanks a lot,
Karel  

RE: Free wall with a height of 15 m

Is this a sound wall?



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RE: Free wall with a height of 15 m

(OP)
To Focht3:

It's not a sound wall.  The wall is around a place to stock sand, lime, ... (I don't know the english term).  It is placed on a new area for industrial activities.  The city is concerned they won't attract industry if the dust is blowing in the wind.  So they obliged the firm to build a 15 m wall.  I think there is a little bit of political vendetta between the city and the firm, but that doesn't concern me.

Greetings,
Karel

RE: Free wall with a height of 15 m

Okay, it's really a screen of sorts.  Where is the site?

Do you have to use concrete?  I'd suggest a look at aluminum or similar lightweight material, unless you think the locals might take shots at it...then use lightweight concrete.  Or steel plate.   

The principal load will be lateral - mostly the moment because of the eccentricity.  You need to get good shear strength and soil profile information for the top 3 or 4 meters along the fence alignment.  I would suggest that you use p-y curves to model the soil behavior.  They are non-linear and do a good job of predicting the maximum bending moments.  Deflection is another matter: none of the current methods is very good at predicting deflection behavior, particularly at working loads.  If deflection is an issue, you might consider braces or tie-downs to control deflection.

P.S. Your English is quite good -



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