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

The different theones appllcabls lo the modeling of eoncrele and steel
re#nfomcmcnr will be dlrcussed bnctly accoidsng to CEB (1988) repon No. 187 rr
follawr.
(I1 Llnearund non-lmear elvstlc models
Llnenr clasttc models m best known due to rhelr nmpltc~ly. buc rr Impact load~ng in
gcneinl cause non-llncwdcfonnation s is not sumd for any aypllcatnon in thtr field
The same may be rtaed for non-Itnear elasl#c models.
(21 Vlvoclvrtlc modelr
Modelr bed on vrruelartlc~ty hrve becn ured for the dercnpllan of creep md
relaxallon phenomena. A few authors have used thlr lheory w~th the ~dev thnr
stm~lvlty between creep md rrraln-rate-effects should erst.
(31 Vtscoplwuc models
Modelr brrcd on !he theory of v~scoplartic~ry have been ured for many years dlro for
the dercnptlon of tmpw problem. The theory of v~scaplvsl~e~ty 13 very conventen1
erpeclally for lhc madclmng of the remforc~ng steel. md may be r~mplrfied to a varl
extent at lea1 for the one-dtmennonal caw.
(41 MDdCls based on planuaty
Madelr k d on the theory of plart~ctly can be arnnged nnlo twocareganes such nr'
(a1 Elaruc-perfectly plarrre matenal behavtor
The material shows elartle behavtor up to a ccnan level, for example
comprerrlve strength where stran IS mcresed at constant stress. The tnfluence of
stress rate can be taken into account by tnereastng the yteld level aecordnng to this
SIRIS mte