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)

242 Shear, bond and torsion
From Table 6.4-2,
Use size 12 links at 100 mm spacing (Asy/sy = 2.26)
(Note: The XI and YI values were based on size 10 links; these are now
slightly greater than the actual values but the effect of the differences
is more than offset by the higher Asy/sy value provided.)
Step8
The reinforcement details are shown in Fig. 6.11-5. The reader should
check that the requirements in Section 6.11: Step 8 are met. The size 12
transverse bars in the ftange amply satisfy the transverse reinforcement
requirement in Section 4.8. (These transverse bars are held in place by
longitudinal bars in the ftange which are not shown here.)
Example 6.11-3
Determine the maximum ultimate torsional moment that may be applied
to the beam section in Example 6.11-2 if:
(a) no torsion reinforcement is provided;
(b) torsion reinforcement is provided.
SOLUTION
(a)
Example 6.11-2(c) shows that the web resists practically all the
torsional moment. From Table 6.11-1,
Vtmin = 0.4 N/mm 2
Using eqn (6.11-1),
T = (!) Vtminh~in [hmax - (hmin/3)]
= (0.5) (0.4) (350 2 ) [800 - 350/3]
= 16.8 kNm
Trensverse bars
J12mm at 300mm centres
Ttree 16mm r;;;~_ ;;;;;;:=:t:.~=1' I
Two16mm
Two 16mm
•
14---12mm links at
100mm centres
1Wo 25mm
+TWo 16mm
•
Fig. 6.11-5