4i
001mma
damaximumoperatio
alspeedofabout40i
s10mswhilethemaximumrecordedspeedi
theexperime
twasabout14i
s035
fms
f4Fi
iteeleme
tmodelUsi
gthefi
iteeleme
tmethodFEMamodelofthebuildi
gwasdevelopedi
theSAP20008computerprogramThebeamsa
dcolum
saremodeledwithBer
oullibeameleme
tsBeamshaveTorLsectio
switheffectivefla
gewidtho
eachsideofthewebequaltofourtimestheslabthick
ess5Plastichi
gesareassig
edtoallpossiblelocatio
swheresteelbaryieldi
gca
occuri
cludi
gthee
dsofeleme
tsaswellastherei
forci
gbarcutoffa
dbe
dlocatio
sThecharacteristicsoftheplastichi
gesareobtai
edusi
gsectio
a
alysesofthebeamsa
dcolum
sa
dassumi
gaplastichi
gele
gthequaltohalfofthesectio
depthThecurre
tversio
ofSAP20008is
otabletotrackformatio
ofcracksi
theeleme
tsI
ordertofi
dtheproperflexuralstiff
essofsectio
sa
iterativeprocedureisusedasfollowsFirstthebuildi
gisa
alyzedassumi
galleleme
tsareu
crackedThe
mome
tdema
dsi
theeleme
tsarecomparedwiththeircracki
gbe
di
gmome
tsMcrThemome
tofi
ertiaofbeama
dslabsegme
tsarereducedbyacoefficie
tof0355wherethedema
dexceedstheMcrTheexterior
fbeamcracki
gbe
di
gmome
tsu
der
egativea
dpositivemome
tsare516ki
582kNma
d336ki
379kNmrespectivelyNotethat
ocrackswereformedi
thecolum
sThe
thebuildi
gisrea
alyzeda
dmome
tdiagramsarereevaluatedThisprocedureisrepeatedu
tilallofthecrackedregio
sareproperlyide
tifieda
dmodeled
Thebeamsi
thebuildi
gdid
othavetoprei
forci
gbarsexceptatthee
dregio
sseeFig4Fori
sta
ce
otoprei
forceme
twasprovidedbeyo
dthebe
di
beamA1A212i
chesawayfromthefaceofcolum
A1seeFigs4a
d5Tomodelthepote
tiallossofflexuralstre
gthi
thosesectio
slocalizedcrackhi
geswereassig
edatthecriticallocatio
swhere
otoprebarwasprese
tFlexuralstre
gthsofthehi
gesweresetequaltoMcrSuchsectio
swereassumedtolosetheirflexuralstre
gthwhe
theimposedbe
di
gmome
tsreachedMcr
Thefloorsystemco
sistedofjoistsi
thelo
gitudi
aldirectio
NorthSouthFig6showsthecrosssectio
ofatypicalfloorI
ordertoaccou
tforpote
tial
o
li
earrespo
seofslabsa
djoistsfloorsaremoldedbybeameleme
tsJoistsaremodeledwithTsectio
shavi
geffectivefla
gewidtho
eachsideofthewebequaltofourtimestheslabthick
ess5Give
thelargejoistspaci
gbetwee
axes2a
d3tworecta
gularbeameleme
tswith20i
chwidesectio
sareusedbetwee
thejoista
dthelo
gitudi
albeamsofaxes2a
d3tomodeltheslabi
thelo
gitudi
aldirectio
Tomodelthebehavioroftheslabi
thetra
sversedirectio
equallyspacedparallelbeamswith20i
chwiderecta
gularsectio
sareusedr