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Spiral Shear Anchor Capacity

Spiral Shear Anchor Capacity

Spiral Shear Anchor Capacity

Good morning,

I am checking an existing bridge (reinforced concrete deck, welded girder with spiral shear anchor) for capacity to support construction equipment.

Record drawings (dated July 1955) show that spiral shear anchors were used.

Does anyone know and/or have any literature on capacity of the spiral shear connector?

Please help,


RE: Spiral Shear Anchor Capacity

Page 9 here claims to reference a formula developed in the 1930s.
"A formula for the strength of spiral shear connectors was developed by Voellmy of the Swiss Federal Institute for Testing Materials A formula for
in 1935."


RE: Spiral Shear Anchor Capacity

Take a look at section 4.9 of Blodgett's book, it has a good example

RE: Spiral Shear Anchor Capacity

Thanks Tmoose. However, I was not be able to find that paper online.

Page 50-12 of Bridge Engineering Handbook (Wai-Fah Chen, Lian Duan) points to AASHTO Specifications 1957 to 1968 for the formula.

But I have not have any luck finding the older AASHTO specs online yet.

RE: Spiral Shear Anchor Capacity

MotorCity: Thank you very much.

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