 |
The dead load of the glulam beam must be taken
into account |
|
Gleichförmige Belastung |
|
Even load |
|
Loading on a span basis is not taken into account |
|
Shear deformations, creep deformations and man
load are not taken into account |
|
|
|
|
Assumption: truss is held against lateral yielding
? no danger of tilting |
|
Modulus of elasticity:
BS 11: E = 11000 N/mm2
BS 14: E = 12000 N/mm2 |
|
Permissible bending stress
BS 11: perm. ρb = 11 N/mm2
BS 14: perm. ρb = 14 N/mm2
across the inner support
BS 11: perm. ρb = 12,1 N/mm2
BS 14: perm. ρb = 15,4 N/mm2 |
|
|
|
|
Permissible shear stress:
τ = 1.2 N/mm2 |
|
fper = l/300 |
|
Decisive design criterion
f = deflection
M = moment
Q = transverse force |
|
Height and width in mm |
|
Span in m |
|
Load in kN/m |
|
|
|
Single Span Beam
Double Span Beam
| p = |
live load or snow load [kN/m] |
g =
|
constant load, inc. dead load of beam [kN/m] |
| q = |
p + g [kN/m] |
|
