F. K. Kong MA, MSc, PhD, CEng, FICE, FIStructE, R. H. Evans CBE, DSc, D ès Sc, DTech, PhD, CEng, FICE, FIMechE, FIStructE (auth.)-Reinforced and Prestressed Concrete-Springer US (1987)

90 Reinforced concrete beams-the ultimate limit state
T
d
1 • As •
(a)
es >ey
(c)
Fig. 4.3-1
.f _ :!_kdcu
Js- d e
where e = A 5/bd. Since the steel stress is below the yield point,Js = Ests
and the above equation can be written as
f - :!. kdcu (4.3-2}
s- d eEs
From eqn (4.2-7),
r,1
es<ey
Fig. 4.3-2