Civil Engineering Reference
In-Depth Information
vi) As a result of the truss or tied arch action, the main flexural
reinforcement carries significant tension along its full length. At a given
section both the top and bottom reinforcement can carry significant tension.
Figure 4.4 gives an example. As a result, in deep beams, the development
and anchorage of the main reinforcement is critical.
Figure 4.4
Steel stress redistribution after inclined cracking
vii) Vertical web reinforcement did not significantly increase the shear
strength of the deep beams. (As will be demonstrated later, the strength does
not increase until there is sufficient vertical web reinforcement to eliminate
the direct compression strut.) Heavy vertical web reinforcement did
significantly reduce the variability in strength and increase the ductility,
viii) The addition of minimum amounts of horizontal and/or vertical web
reinforcement often reduced the failure load to below that of a comparable
