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Counterfort/Buttress Wall Dimensioning

After computing forces acting on the structure the program determines all internal forces in the verified cross section (shear force Q and moment M) and then verifies the cross section bearing capacity employing one of the setting selected in the "Wall analysis" tab.

Wall stem - horizontal direction

Maximal moment at the center of the span between counterforts/buttresses at the front side of the wall stem:

Maximal moment at the counterfort/buttress at the back side of the wall stem:

Maximal shear force:

where:

σpi

-

average stress at the back side of the wall stem

l

-

counterfort/buttress spacing

Wall stem - vertical direction

Maximal moment at the center of wall height at the front side of the wall stem:

Maximal moment at the bottom at the back side of the wall stem:

Maximal shear force:

where:

σH

-

stress at the bottom at the back side of the wall stem

H

-

wall height

l

-

counterfort/buttress spacing

Wall jump - buttress wall

Maximal moment at the center of the span between buttresses at the upper side of the wall jump:

Maximal moment at the buttress at the bottom side of the wall jump:

Maximal shear force:

where:

σj1

-

maximal stress under wall jump

l

-

buttress spacing

Wall heel - counterfort wall

Maximal moment at the center of the span between counterforts at the upper side of the wall heel:

Maximal moment at the counterfort at the bottom side of the wall heel:

Maximal shear force:

where:

σj

-

maximal stress under wall heel

l

-

counterfort spacing

Counterfort / Buttress of the wall

Counterfort / Buttress is verified as rectangular cross section. Calculation of internal forces is same as for wall stem of cantilever wall. Internal forces are multiplied by the loading width l+b (counterfort/buttress spacing + counterfort/buttress thickness).

Internal forces at places of other checks (Wall heel - buttress wall, Wall jump - counterfort wall) are calculated same as for cantilever wall.

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