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Longitudinal Stiffeners & Block Shear in Coped Beams

Longitudinal Stiffeners & Block Shear in Coped Beams

Longitudinal Stiffeners & Block Shear in Coped Beams

(OP)
Another structural engineer and myself are having a problem with block shear at the ends of coped stringers on a straight, steel bridge. The ends of most of the stringers must be coped around the flanges of the floorbeams, so block shear is an issue. In order to resolve this, we've thought about adding longitudinal stiffeners (see AISC SCM 14th Edition, page 9-18).

My question is: when adding these stiffeners, does this preclude block shear as a failure mechanism? We've both thought through the physics and have our own ideas, and I was hoping to see what most people thought on this topic.

Thanks!

RE: Longitudinal Stiffeners & Block Shear in Coped Beams

It doesn't eliminate the failure mode but it improves it. You're allowed to use the area of the flange (long. stiffener) as part of your shear rupture area. I know because I was very wrong about this in a previous thread.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Longitudinal Stiffeners & Block Shear in Coped Beams

(OP)
KootK; by what you said do you mean that the net shear area could be increased by (thickness of longitudinal stiffener)*(width of longitudinal stiffener)? If so, do you know of any references that support this?

RE: Longitudinal Stiffeners & Block Shear in Coped Beams

For shear rupture, yes, that's exactly it. I'd have to dig up that thread where it was discussed. I was taken aback by it really. I was sure that you could only use the web area.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Longitudinal Stiffeners & Block Shear in Coped Beams

Easy apparently: Link

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Longitudinal Stiffeners & Block Shear in Coped Beams

(OP)
Thanks for the help KootK!

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