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Additional beam steel required both transversely and longitudinally
FIGURE 20.26 Additional cap beam bottom reinforcement for joint force transfer [37]. Note: Id = development length.
shrinkage, and the relative longitudinal earthquake displacement, and shall not exceed the following minimum seat requirements [35]: For seat width at hinges
Nmin = larger of
600 mm where Deq is total relative displacement between frames. For seat width at abutments
= larger 0f <j ApS + Acr+Sh + Dtemp + Aeq + 1°°
where Aps, Acr+sh, Atemp, and Aeq are relative displacement due to prestressing, concrete creep and shrinkage, and earthquake, respectively (mm).
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