Broch

STRUCTURAL DESIGN
Slab stress of the
cross-laminated timber
Panel load
Version 1 / 2011
M1 BSP crossplan
The following equations may be used for stress in the panel plane (slab stress) under the
requirements of the technical column theory:
Thickness of the lamella layers in the direction of stress
Thickness of the lamella layers normal to the direction of stress
� Distances between centres of gravity:
Maximum
where
Design value of the shear force
Calculation of the bending stresses and bending stiff ness may be carried out using the full
section of the lamella layers in the direction of stress. When calculating the shear stresses,
the net area with the smaller cross-section of the two stress directions is decisive.
Material characteristics according to ETA-09 / 0036
Property Numerical value
Strength classes of lamellas
Modulus of elasticity:
C24
• Parallel to fi bre direction of lamellas E0, mean
11600,00 N / mm
• Perpendicular to fi bre direction E90, mean
2
370,00 N / mm2 Modulus of shear:
• Parallel to fi bre direction of lamellas G 090, mean
• Perpendicular to the fi bre direction of the lamellas, modulus of rolling
shear G 9090, mean
Bending strength:
• Parallel to fi bre direction of lamellas f m, k
• f m, k may be increased to to 28,8 N/mm 2 for C 24 (f m, CLT, k) in accordance with the
approval referred to above
Tensile strength:
• Perpendicular to the fi bre direction of the lamellas f t, 90, k
Compressive strength:
• Perpendicular to the fi bre direction of the lamellas f c, 90, k
Shear strength:
• Parallel to fi bre direction of lamellas f v, 090, k
• Perpendicular to the fi bre direction of the lamellas (rolling shear strength) f v, 9090, k
t1 t2 t1 t2 t3 650,00 N / mm 2
50,00 N / mm 2
24,00 N / mm 2
0,12 N / mm 2
2,50 N / mm 2
2,50 N / mm 2
1,10 N / mm 2
Mayr-Melnhof Kaufmann 13
H