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counterforts

Counterforts are vertical structural members integrated into a wall to resist lateral forces, most commonly earth and water pressures acting on retaining structures and dams. They are thin, reinforced concrete webs or slabs placed at regular intervals and tied to the main wall, creating triangular or hollow cross sections that transfer loads to the foundation. By distributing bending and shear forces through the counterforts, the stem or upstream face can be made thinner and lighter without compromising overall strength.

In retaining walls, counterfort construction involves a relatively thin stem wall that supports soil on its

In dam engineering, a counterfort dam uses vertical counterforts on the downstream side of the upstream-facing

Key design considerations include appropriate spacing and thickness of counterforts, reinforcement detailing, seepage control, joint integrity,

upstream
side,
with
counterforts
extending
from
the
interior
or
downstream
face
to
connect
to
a
thick
base
slab.
The
counterforts
act
as
compression
members,
reducing
bending
in
the
stem
and
enabling
material
savings
for
taller
walls.
Spacing
and
dimensions
are
chosen
to
balance
structural
efficiency,
drainage,
and
construction
practicality.
water
barrier.
The
counterforts
connect
the
upstream
face
to
the
foundation,
forming
hollow,
triangular
sections
that
carry
most
of
the
load
in
compression.
This
arrangement
reduces
the
amount
of
concrete
required
for
a
given
height,
while
maintaining
stability
against
hydrostatic
and
seismic
forces.
and
constructability.
Proper
detailing
ensures
monotonic
load
transfer,
durability,
and
ease
of
maintenance
over
the
structure’s
service
life.