Rafters to Ec3
March 16, 2017 | Author: starsplesh | Category: N/A
Short Description
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Description
Job No: Job Name: Date: Drawing Ref: Prepared by: Checked by: Site Ref: Other:
Common Rafters
Span Centres
= =
3100 400
mm mm
Permanent Load (gk)
=
1.02
kN/m
γG
=
Variable Load (qk)
=
0.6
kN/m
γQ
=
γG gk + γQ qk = Loading FEd
2.277 kN/m2 =
2.277 kN/m2
x
400 mm
=
=
0.91 kN/m
x
3100 mm
=
MEd
FEd x Span
=
1.09 kNm
8 Use the following grade timber: fm,k ->
=
16 N/mm2
E0,mean
=
8000 N/mm2
-> Wy,req
C16
MEd
≥
σm,y,d σm,y,d fm,y,d fm,y,d
Service Class: kh ksys kmod
σm,z,d
+
km
=
kh
ksys
kmod
=
1.00
1.10
0.80
= = =
2 1.00 1.10 0.80
fm,z,d
≤
1
fm,k γm 16 1.30
=
10.83
γm km
=
1.30
=
0.70 Job No: Job Name: Date: Drawing Ref: Prepared by: Checked by: Site Ref: Other:
Common Rafters σm,y,d
+
10.83 ->
0.70
σm,y,d
Wy,req
σm,z,d
≤
fm,z,d
≤
10.83 N/mm-2 MEd
≥
1.09
=
σm,y,d Provide: Iy
1
=
10.83
101.02
47 x 125 C16 Grade Timber Rafter
Wy
=
7.65 x 106mm4
=
122 x103mm3
Deflection Permanent Load (gk)
=
1.02
kN/m
Variable Load (qk)
=
0.6
kN/m
x
400
x
3100
=
x
400
x
3100
=
Permanent Load per Joist (Fd,G) = 1.02 Variable Load per Joist (Fd,Q) = uinstG
=
0.6 5 384
E
=
uinstG
=
1.93
uinstQ
=
5 384
uinstQ
=
x
Fd,G L3 EI
8000 N/mm2
1.14
12 5
+
A
x
=
5875
mm
x
mm
Fd,Q L3 EI
+
12 5
x
kdef
=
ufin,G
=
0.8 uinstG (1+kdef)
=
3.48 mm Job No: Job Name: Date: Drawing Ref: Prepared by: Checked by: Site Ref: Other:
Common Rafters ufin,Q1
=
Ψ2
=
ufin,Q1
=
ufin
=
wfin
=
uinst,Q1 (1+Ψ2kdef) 0.3 1.41 mm ufin,G Span 250
=
Provide: Iy
ufin,Q1
+
12.40
=
=
12.4 mm
>
4.89
47 x 125 C16 Grade Timber Rafter =
7.65 x 106mm4
Wy
=
122 x103mm3
ufin
=
4.89 mm
4.89 mm
1
1.35 1.5
0.91 kN/m 2.82 kN
10.83
N/mm-2
101.02
x103mm3
1.265 kN 0.744 kN Fd,G L3 EA 5875
Fd,Q L3 EA
mm2
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