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Caltrans Bridge Design Practice Chapter 21 Abutment Shear key design

Caltrans Bridge Design Practice Chapter 21 Abutment Shear key design

(OP)
On Caltrans Bridge Design Practice 4th Edition Chapter 21 page 21-96, the calculation of effective width bv for Vww showed the superstructure depth (6.75') plus 1/3 of the abutment stem height (7.25'). Could you explain why 1/3 of the stem height was used instead of full height of the abutment stem wall?

Thank you a lot.

RE: Caltrans Bridge Design Practice Chapter 21 Abutment Shear key design

That example is lacking several figures to help visualize the problem. I took a look in the Seismic Design Criteria (where the equation is being pulled from) and it is also not very clear. banghead

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