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 settings 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 backside of the wall stem:
Maximal shear force:
where: | σpi | - | average stress at the backside 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 backside of the wall stem:
Maximal shear force:
where: | σH | - | stress at the bottom at the backside 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 the same as for wall stem of the 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 in the same way, as for cantilever wall.