a[mm]/l - Memorial University of Newfoundland DAI

occumd tn the bigger target care than ~n the smaller turgrr. The pnenl shapes of
perforation crates were also stmtlvr on ail 3 r~rcr of targel. h har ken concluded that the
use of wale models. over the Elre range terted. to prow& dar~ an the perforallon
performance of retnforced concrete are jun#ficd.
2.3.42. Eumpan Dsign Codes for Punching Shear Capscity and Critical
Perforation Velocity
The rtatlc punchtng shsarcapactty as rpeclfied ~n the Norwcgvan Code Ir expressed as
follows
where. f,,, = derngo lenrllc strength ot concrete
y, = matenal coefficncnt for retnforced
k,, = IW ~lmm'
1.0 < k,.(= l.Sdldl)c 1.4 . dl = I0 m
d = mean slab deph tn the two reinforcement dlrectlonr
a = lmgrh of penmeter of the gavcmlng xellan at a dnnance 1.0 d
fmm the l&d area
p = geametneal mean of the onhogonal tenrlon remforrcmenl noa.
(2.25)
Thc upper value of the deslgo punching ~hevcapx~ty is ismlted by comprerslve fanlure.
However. thls llmltatlon a not rrlevnnt m the case di~used here.
The enucal vcloclly of perforat~on for the dynvm~e loading of a two-way plate ar
recommended by Cammtnee Euro-lntcmauonal du Beton. CEB (1988) will be cxammed.