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that depends on why the rebar is needed, but when it is near a support beam the beam will have more stiffness and work as a the rebar for the shear , so the longitudinal bars will not do a lot of work.
after the crack caused by shear stresses yes , before that no , because this bottom bars doesn't resist shear stresses, the stirrups do , so we must strengthen the stirrups directly after the support to resist shear stress because the zone after support is the maximum shear zone
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