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

the manufncrurer. Th~r nccelemmerer recorded the venmcal acceleratton of Le pm~cettle
together wllh rhe plate. The Impact velocnly was !hen calculared.
3.62. Deflections
Deflecuan of the rest rpeetmen war mevrund dunng sspenmsntrl by m e*.lcmnl LPDT
pga Dcflcction was iecordcd at thc center of th* plate. The mastzr pancl iccarded the
defleclton d~ta. and the elcctncal straln gages reading were stored a the data vcqulslllon
system
The voltage readmgr were convened to defleeuanr ustng the LPDT crllbnuon
fiactor. The awnlog clecrncnl slgnalr cams fmm the tnrtnrmeno were convened lhmugh
the data ilcqulrnlton board lo dmgllrl ngnalr and recorded tn n d>g,wl computer filer a!
svmplnng rate of IWO M as well. The LPDT at the center of the terced yxamen wa
plrccd m !tr posltaan Marc rccunng the rpeclmen ~n pos8tlon as shown ~n Figure 3 15
3.63. Strains
3.6.3.1. S-1 Stmim
In order to oblrrn the srntn dssrnbul~on at the cracking prwesr zone. four eleetnsal
reanance sleel rtnm gages wnth gage length of 10 rnm were rttrchcd at dlfferent
lwat8ons. Theelectncal rerlrlancc rtratn gages had a resistance of 120t0.39. ohms nnd a
gage factor of Z.M+0.5% was used forcalrbratlon.
For pmectlon agarnst any passlble waer damage dunng concrete casung, the
steel swam gages wett coated wnh a pmtective swlmt and then covered with a rhnnk