Determine the spacing of
U
-shaped D10 stirrups for the following cases. Note:
f_(ck)=21MPa,f_(y)=400MPa
, normal-weight concrete,
A_(v)=143mm^(2)
(area of two legs), a)
V_(u)=53kN
b)
V_(u)=160kN
c)
V_(u)=186kN