Railroad Tie Allowable Stress

[ash060]

Working on a project that is supporting some equipment on railroad ties, and I am having trouble with finding properties on them. I noticed at a few places that a modulus of rupture is specified, and not an allowable bending stress like I am used to. Would that MOR be used in lieu of allowable bending or is it something different all together.

 

[Ron]

Are you supporting on wood ties or concrete ties. Modulus of Rupture is usually used for concrete ties.

Check AREMA publications for various properties

 

[ash060]

They are wood ties. I have seen modulus of rupture for wood ties but not an allowable bending.

 

[BridgeSmith]

Wouldn't it just be the allowable bending stress for a timber of the wood species used for the ties, with the applicable factors for treatment, incising, etc.?

Rod Smith, P.E., The artist formerly known as HotRod10