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Flexural Resistance Built-up Members

Flexural Resistance Built-up Members

Flexural Resistance Built-up Members

(OP)
Hello.
I am attempting to analyze a built-up truss member for flexural loading. AASHTO does not provide direct guidance for the flexural resistance of a built-up member in 6.12.2.2 as it does for compressive resistance in 6.9.4.3 for built-up members. I could treat it as a box-shaped member, but I wanted to know if there were any other methods that are used.

The member comprises of single angles with a web plate and battens top and bottom (red lines) at discrete locations.

Thank you in advance.

RE: Flexural Resistance Built-up Members

Yes, what Wiktor linked is the standard reference for this question in the bridge world.

In practice, we found that for most bridges, a suitably small value of "lattice plate thickness" could be assumed for the J calculation rather than calculating it independently for each member, with little error introduced.

----
just call me Lo.

RE: Flexural Resistance Built-up Members

(OP)
Thank you for that link.
It looks as if my battens offer no contribution since they are in the X-X plane as per Figure 3 and Equation 4.

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