Flanged deep beams - Reinforced Concrete Deep Beams - page 127

weight concrete; C 2 is a coefficient equal to 130N/mm 2 for plain round bars
and 300N/mm 2 for deformed bars and b, h, y, x and a are as shown in Figure
5.7. Eqn (5.6) was based on the large number of tests carried out at
Nottingham and Cambridge Universities under the leadership of Professor
Kong, on simple span deep beams with low a/d ratios and with various web
reinforcement configurations.
The first term on the right hand side of the equation is the load carrying
capacity of the concrete compression strut on the variables. The
compression diagonal is a component of the truss model intended to explain
the beam resisting system. It is assumed that the concrete strut fails in
splitting mode when this capacity is reached.
The second term on the right hand side is the contribution of steel
reinforcement. The contribution varies as y, the depth of individual web bar,
measured from top of the beam.
5.4.3 Method of Taner et al.
Based on the diagonal splitting strength of concrete Taner et al. have
suggested that the ultimate capacity of beam panels can be obtained from the
following equation
(5.7a)
where f tc is the limiting tensile strength at which diagonal splitting will
occur; As is the area of individual web bar located along the diagonal (main
Figure 5.8 Taner et al. panel beam—symbols