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9.7 INCLINED SCREWCONNECTION
A canopy over the entrance of a one family house is planned to be supported to the external wall by a 51x200
mm LVL 48 P ledger beam. The beam is connected with inclined screws in 45° angle to the edges of 51mm
thick LVL 32 P wall studs which have spacing s = 600 mm. Line load from own weight
g
k
is 0,3 kN/m and im-
posed load from snow
q
k
is 3,5 kN/m. Service class SC2.
Loading combinations
The most critical ultimate limit state (ULS) load combination for each connection between the beam and
stud:
E
d,ULS
=
s
∙ (
γ
G
∙
g
k
+
γ
Q
∙
q
k
)
E
d,ULS
= 0,6m ∙ (1,15 ∙ 0,3 kN/m + 1,5 ∙ 3,5 kN/m) = 3,4 kN
Note: Safety factors γ
G
and γ
Q
are according to Finnish National annex of Eurocode 0.
Screw properties
Size 6,0x140mm full threaded screw
Threaded length
l
g
= 123 mm
Unthreaded length
l
u
= 17 mm
Head diameter
d
h
= 12 mm
Tensile strength
t
tens,k
= 10 kN, determined in accordance with EN 14592.
Head pull-through strength
f
head,k
= 13 N/mm
2
, when
ρ
a
= 350 kg/m
3
Modification factor kmod for medium-term load, SC2
= 0,8
Material safety factor γm for connections (default value in EC5)
=1,3
9. CALCULATION EXAMPLES OF LVL STRUCTURES
200
LVL Handbook Europe