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Railroad Bridge Walkway: Post-to-Tie Connection

Railroad Bridge Walkway: Post-to-Tie Connection

Railroad Bridge Walkway: Post-to-Tie Connection

(OP)
I've been sifting through AREMA and have found no help:

We're using angles as posts, bolted through timber bridge ties, for a walkway railing.  I have to evaluate the connection for a 200# transverse load applied at the point of connection for the top rail.

I don't know if the allowable unit stresses in the AREMA "Timber Structures" volume apply to bridge ties.  I fear ties are not graded for strength like structural timber, which seems to be the focus of these tables.

See:
Table 7-2-13
Table 7-2-15
Table 7-2-16

RE: Railroad Bridge Walkway: Post-to-Tie Connection

Do you have any idea what the grade of timber is??

About the worst I have seen is an Fb in 500 psi range... but a good dense Pine or Fir can exceed 2000 psi.

RE: Railroad Bridge Walkway: Post-to-Tie Connection

(OP)
All I know is that we're specifying oak ties.  Not sure about the grade.

RE: Railroad Bridge Walkway: Post-to-Tie Connection

Find the worst case OAK and maybe go from there??

RE: Railroad Bridge Walkway: Post-to-Tie Connection

(OP)
That's my inclination.  So you do believe the tables I listed are applicable to bridge ties.

RE: Railroad Bridge Walkway: Post-to-Tie Connection

be hard to say wouldn't it? Aren't those ties soaked in creosote?   

RE: Railroad Bridge Walkway: Post-to-Tie Connection

(OP)
ToadJones:
They are indeed.

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