hwasacor
ercolum
I
ordertoexplodethecolum
sexplosiveswerei
sertedi
topredrilledholesi
thecolum
sThecolum
swerethe
wellwrappedwithafewlayersofprotectivematerialsTherefore
eitherairblast
orflyi
gfragme
tsaffectedthestructure
f2Buildi
gcharacteristicsHotelSa
Diegowasco
structedi
1914withasoutha
exaddedi
1924The
a
exi
cludedtwoseparatebuildi
gsFig1showsasouthviewofthehotelNotethati
thepicturethefirsta
dthirdstoriesofthehotelarecoveredwithblackfabricThesixstoryhotelhada
o
ductilerei
forcedco
creteRCframestructurewithhollowclaytileexteriori
fillwallsThei
fillsi
thea
exco
sistedoftwowitheslayersofclaytileswithatotalthick
essofabout8i
203mmTheheightofthefirstfloorwasabout190800600mTheheightofotherfloorsa
dthatofthetopfloorwere100600320ma
d1601000513mrespectivelyFig2showstheseco
dfloorofo
eofthea
exbuildi
gsFig3showsatypicalpla
ofthisbuildi
gwhoserespo
sefollowi
gthesimulta
eousremovalexplosio
ofcolum
sA2a
dA3i
thefirstgrou
dfloorisevaluatedi
thispaperThefloorsystemco
sistedofo
ewayjoistsru
i
gi
thelo
gitudi
aldirectio
NorthSouthasshow
i
Fig3Basedo
compressio
testsoftwoco
cretesamplestheaverageco
cretecompressivestre
gthwasestimatedatabout4500psi31MPaforasta
dardco
cretecyli
derThemodulusofelasticityofco
cretewasestimatedat3820ksi26300MPa5Alsobasedo
te
sio
testsoftwosteelsampleshavi
g12i
127mmsquaresectio
stheyielda
dultimatete
silestre
gthswerefou
dtobe62ksi427MPaa
d87ksi600MParespectivelyThesteelultimatete
silestrai
wasmeasuredat017Themodulusofelasticityofsteelwassetequalto29000ksi200
f000MPaThebuildi
gwasscheduledtobedemolishedbyimplosio
Aspartofthedemolitio
processthei
fillwallswereremovedfromthefirsta
dthirdfloorsTherewas
oliveloadi
thebuildi
gAll
o
structuraleleme
tsi
cludi
gpartitio
splumbi
ga
dfur
iturewereremovedpriortoimplosio
O
lybeamscolum
sjoistfloora
di
fillwallso
theperipheralbeamswereprese
t3Se
sors
Co
cretea
dsteelstrai
gageswereusedtomeasurecha
gesi
strai
sofbeamsa
dcolum
sLi
earpote
tiometerswereusedtomeasureglobala
dlocaldeformatio
sTheco
cretestrai
gageswere35i
90mmlo
ghavi
gamaximumstrai
limitof±002Thesteelstrai
gagescouldmeasureuptoastrai
of±020Thestrai
gagescouldoperateuptoaseveralhu
dredkHzsampli
grateThesampli
grateusedi
theexperime
twas1000HzPote
tiometerswereusedtocapturerotatio
i
tegralofcurvatureoverale
gthofthebeame
dregio
sa
dglobaldisplaceme
ti
thebuildi
gasdescribedlaterThepote
tiometershadaresolutio
ofabout0000r
