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)

134 Reinforced concrete beams-the ultimate limit state
(a)
A
a
'
X
a
'
A
A B c D E
~t + ~-+-!-+t~
(b)
(c)
{d)
(e)
1·25~Mp
u
o·s,..,p
f
flul
4
.-...:::::;;;. ___ ___;.___ ___ ~ _L
Fig. 4.9-2
or
M =Qui- MP
p 4 2
Therefore, at collapse, the moment at section C is
Me= Mp = iQul
(4.9-l(a))