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

3. The steel reunfarcemcnt has a major effect on the dynamle behavtar of h~gh-strength
concrete plates, lncreas~ng retnforcemenr nuo fram 1% to 1.5%. the cncrgy
rbsorptlan tncmarcd by 50% for hcgh-nrengh concrete and 100% for normal-
strength concrete. whnle the cntncal veloclty of perfonuon maeased by about 10%
for both high-strength and normal-strength concrete. lncreas~ng rennforccmsnt ratlo
from 1% to 2%. the cncrgy abrarprlon mcrcascd by about 3004 md the cntlcal
velocxty of perfanuon ,"creased by about 20% for both high-strength and normal-
rrrenglh concne. Increasing re~nforeemsnl nua fram 1% to 2.5%. the energy
ahsorpllon sncreued by about 400% md the crit!cal velocity ~ncreised by about 30%
far hngh-rtmgrh concrete u well as normal-ntrengIh concrete.
4 The effect of the end-condieon was las ~xgn8ficvnt on the behvvlor of hvgh-rrrenph
concrete plater under imprcl lord. Ar concrcrc strength mcreased from normal-
strength lo htgh-strength. the cnrtcal velocity of prforatnon inerwwd by about 20%-
30% for the snmply rupponcd speclmcnr. While under fixed-end candtt!on. he
cnrlcal velrrxty of perfowion lncrersed by about 50%-60%.
5 In the case of rtatle loadmg, the peak-load, peak-nwn md mnr~murn-defleeeon
occurred at the same ume. However. I" the case of tmpacc loadmg. the peak-smln
oecur. rllghtly later than lo the peak-load bur ahsad of manmum-dcflem~on. In
addieon. the tension nee1 nnln s esumared by about twice that recorded under rtattc
loading. The ten results illunnte the difference between ampacr failure mechvntrm
compared to rutsc fatlure mechannsm. All of the impact tcn specimens failed under
ductile shear failure.