Knauf Seismic Design

Table 10: Collapse loads for metal stud shear walls from [9]
Cladding 1 Cladding 2 Spacing of
screws s r
[mm] at
perimeter
Horizontal
load F H
at
collapse
[kN]
Vertical
load F V
at
collapse
[kN]
Number
of tests
Continuation from page 14
...by varying the spacing of the screw
attachment were tested for this research
paper. A dimensioning calculation has been
Gypsum
fi ber board
(e.g. Knauf
Vidiwall)
Cementous
fi ber board
(e.g. Knauf
Aquapanel)
Gypsum
fi ber
board
(e.g. Knauf
Vidiwall)
100 39.8 0 3
150 33.1 0 3
150 43.6 0 3
Chipboard 150 39.9 0 3
Trapezoid
metal sheet
172/150 39.0 0 3
none 200 12.2 30 1
also developed by Bernd Naujoks.
The test results shown in table 10 are not
dimensioning values ; these are breaking
loads with defi ned collapse criteria without
statistical consideration or safety factors.
The collapse of wooden panel partitions is
usually caused by the connections between
the board and the wooden framing members.
For metal stud partitions, however, the col-
1
3
1
3
1
3
F V
F V
F V
F H
lapse can be caused by the buckling of the
lower end of the pressure-impacted stud if
the spacing of screws is small enough. [11]
Additional reinforcements in this area, e.g.
corner bracing components increase the
load capacity of metal stud shear walls.
260 cm
It should, however, be borne in mind that
the fi gures stated do not take into account
Figure 22: Load set-up for Table 10
125 cm
any effects of creeping under permanent
loads. Hence, it should be ensured that no
permanent loads occur through plastic deformations
or the restraint of fl anking components.
Drywall shear walls can be used up to 5
stories.
Table 11: Comparison of shear capacity of masonry walls and
Knauf shear walls
Wall type
(l=5m, h=3m)
Total capacity
kN
Capacity
kN/m
Weight of wall
kg/m²
120 mm masonry 1) 9 1.8 194
180 mm masonry 1) 15 3.0 299
240 mm masonry 1) 20 4.0 405
≥ 75 mm Knauf W 111 2) 12 2.4 25
≥ 100 mm Knauf W 112 2) 19 3.8 50
1)
Strength of bricks = 15.0 N/mm²
2)
Studs c/c 600 mm. Screw spacing around perimeter 200 mm in both layers.
In table 11 the shear load capacity of masonry
and Knauf shear walls is stated for
walls 3 m high and 5 m long.
It shows that the shear capacity of Knauf
partitions is comparable to the capacity of
conventional masonry with a signifi cantly
lower weight.
Material values for dimensioning are stated
in tables 12 and 13, pg 17.
15