Question

Is the allowable stress for wood always constant? Discuss how load duration affects allowable stress.

Answer 1

Yes, allowable load is always constant because if we see what changes is ultimate load carrying capacity of wood with respect to time so if we keep changing the factor of safety accordingly we will get a constant allowable load carrying capacity.

Load duration actually affects allowable stress this indicates that its elastic and viscous (time-dependent) characteristics determine its mechanical behavior so it alters the load carrying capacity of the material