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

examlned with respect ro the expenmmwl results The values of the cnacal vcla~ty of
perfowlon calcularcd fmm rhc test results are compared lo vrlucr calculared according to
the dynamle code CEB (1988).
A fracture mechanics analysis was used to evaluate the tmpact loads on hhlgh-
strength concrete plate. The fracture rnechanncs appmach 3s consldsred r s od promnrxng
approach bi lnvtsttgarlng the hnltle fa~lun of amcrunl concrete clcmenn accurately
The fracture mechvnlcr appmvch 18 usedto mvcrllgate the effect of the rate of laadlng on
a bnttlc marenal bared a Isnear cla~r~c fracture rnechan~cs (LEFM) Onc of the
ahjecllve~ of the prewnt study IS to pmvlde the deslgn englnssrn with a rate renrltlvlty
numkr for high-strength concrete plates
5.2. Impact Load
In order ro calculae the Impact load of the lest nrulfr. the venncal equation of dynamrc
cqu~l~bnum. tgnonng damping. cm be wntten as.
Ftr) = m, m, (5.11
where F(r)lr rhs total force. a,lr the total xcclerat~ons, and the total mass m, Ir the
rum of the projectile mars and half of the specmen mass. If 0, Is equal to the projesulc
accclera8an rrp. whtlc ntpand rn, are the masses of the pmjeetile and the specnmen.
rerpecnvely. Equation (5.1) ean then bs wnnen as:
F(r) = (mp + 0.5 m , ) ~ ~
Equntlan (5.2) can thm be used for ccalculat~ng the impact lest load P,#,, = Fit1