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

concrete strength. and had rhc same re~nfommencmtia and ruppon cond1r8an revealed
that energy absarptmn mereased wnth !he tneredw of concrete nrengh. The use of hlgh-
rtrengrh concrete plate can be employed 10 lmpmvs the energy absarpllon cirpahtl~ry of
the concrete plate by aboul4 ttmcs hlgherthan normal-rtrenah mnereleplare
The effect of supponsond~t~on on the energy abrorptlan capaclty war nor r
e:nlficml fsctor hr Lc cndsondltlon changed fmm Rxcd to rlmply-wpponcd. a 5llohr
change ~n the energy absorprlon eapxaly of the ten plate was recorded. On !he other
hand. the effect of relnforccmsnt ntro on the energy absorption capaclly was rlgnlficml.
For errmple. tncreaslng the retnfarcement nuo imm I% ro 2%. rhe energy abrorptlon
crpclty of the rpetmen sncreascd by about lhme t>msr. both for the care of htgh-
rtrengh and nomal-strength concrete.
4.4. Steel and Concrete Strains
F~gures 4 22 through 4.37 show the dtrtnbut~on of the measured steel nmns snd concrete
itrams of all rpemmenr. The rtwns were mcarured at polar of speclnl lnteresl ~n order lo
obtan ~nformat~on on the aate of r!mra. as menuoned #n recuonr 3.6.3.1 and recrton
3.6.3.2. Unfonunately. not all the mcarursd data are reponed snce Eame stram gages
were lost due to slecmcal problems and dzimages lo tho gags dung castlng.
All the tested spcimens eipnmeed ylcldlng of steel relnforccmnt befare
punehtng fatlure accumd. The tenston reinforcement reached the yteld pomr at straw of
about 0.W25. Comparing the lenston rrel stnln at approximately same locartan from [he
compresslo" face. It has been found that the steel strains m the ease of tmpact loading
were about rwlm htgher than those corded for static load~ng as lrpned prrviourly.