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

The numeneal lnvcstlgatnon war earned our lo verify the vnl~dnly of the coder'
predimlonr. The resonled lmpaCt load eapncases were compmd with rtatc capacstter of
cumnt coder' predlct~m. In uddltlon. a fracture mechanlcs tmpvet load analyslr based on
lhnear elarucr fncture mcchanxcr (LEFM) was performed. The purpose of Ihe numerical
Inverogauon was ro piovlde a more deratled analyrlr on the effect of the rate of land~ng
on the dynamic behamor of high-strength concrete plater. The dynamscr fixture energy
of the leslcd plates were comparcd lo ~wtlc fracture energy calculsted from prevlaur
inverligeorr.
6.1. Experimental Investigation
Expenmental rtvdxa were conducted on stxteen re~nforced eanmtc twrrway plater
rubjcclcd lo impact lading. The followcng emelus~onr were *ached from the present
tnvesugalan ewcsrnlng the effect of concrete strength. steel rr~niarccmcnt mtlo. md
end-condlttan
I. All EpeCimens fallsd under duct~lc shear fatlure. The observed angles of hilurc were
about M) degree for normal-strength concrete and 65 degree for hlgh-rtrenph
concrete. In addillon. the punchlng shear surface on the tension face was laated at a
dnstanee of 1.6-2.0 tnmer the plate deplh (d) fmm the edge of loaded area for the most
of the tested spamenr.
2. As the concrete ruenph incrensed from nmal-rt-ngth to hlgh-strength (35 MPa to
SO MPa). energy absorption capaelty and cnttcal velasty of perforaim mcrrased.
The energy absorption capanty mncreased by a a gc of about 3-5 timer. and the
critreal velsity of perforat~on inerrad by a range d aboul20%-30%.