To avoid the risk of a brittle shear failure, the ACI code requires that beams be constructed with stirrups if the factored shear force Vf exceed ^Vc. This requirement is relaxed for one-way slabs, however, as the code requires stirrups for these elements only when Vf exceeds the full value of фVc. Yet it has been
shown in an extensive companion research program that the web width (bw) has no effect on the failure shear stress of reinforced concrete flexural members (Sherwood et al., 2005b). As such, deep one-way transfer slabs in high-rise construction are particularly vulnerable to the size effect if designed using the ACI code, as the designer may wish to proportion the slab such that no stirrups are required.