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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