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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