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Caltrans Bridge Design Practice Chapter 21 Abutment Shear key design

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jy4661

Structural
Apr 24, 2012
3
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.
 
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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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