Which modulus of elasticity should I use?

[Arne999]

Find the table below but there are a few variations of numbers

If I have a truss of class C24 and want to calculate deflection, is 370MPa used as a material property? I understand it's different in different directions in the wood but the table also specifies a number for "analysis of load-bearing capacity"

If I input 370 for C24, I'm on the safe side since that number is the lowest anyway, but it still feels a bit wrong since it's not perpendicular forces.

(Of course, I can complicate things and define differently in different directions but I don't know how to do this correctly at the moment...)

 

[Daniel 109]

No, the bending forces are parallel to the fibers.

 

[largab]

Found the table below but there are a few variations in numbers.

If I have a truss with class C24 and want to calculate deflection, should 370MPa be used? I understand it's different in various directions in wood, but the table also provides a figure for "analysis of load-bearing capacity."

If I enter 370 for C24, then I'm on the safe side since that number is the lowest, but it still feels a bit wrong since the forces are not perpendicular.

(Of course, I can complicate things and define differently in different directions, but I don't know how to do this correctly at the moment...)

To calculate deflection, I would use 11000MPa. It's along the fibers that it stretches then.

 

[Arne999]

ahhh then it became stable things