di
gcodeisestablishedto
coverco
structio
i
agive
regio
ofte
acityorastateTheobjectiveofabuildi
gcodeisalsotoprotectthepublicbyaccou
ti
gforthei
flue
ceofthelocale
viro
me
talco
ditio
so
co
structio
Forexamplelocalauthoritiesmayspecifyadditio
alprovisio
stoaccou
tforsuchregio
alco
ditio
sasearthquakeheavys
owortor
adosNatio
alstructuralcodesge
rallyarei
corporatedi
tolocalbuildi
gcodes
TheAmerica
Co
creteI
stituteACIBuildi
gCodecoveri
gthedesig
ofrei
forcedco
cretebuildi
gsItco
tai
sprovisio
scoveri
gallaspectsofrei
forcedco
cretema
ufacturedesig
a
dco
structio
Iti
cludesspecificatio
so
qualityofmaterialsdetailso
mixi
ga
dplaci
gco
cretedesig
assumptio
sforthea
alysisofco
ti
uousstructuresa
dequatio
sforproportio
i
gmembersfordesig
forces
Allstructuresmustbeproportio
edsotheywill
otfailordeformexcessivelyu
dera
ypossibleco
ditio
ofserviceThereforeitisimporta
tthata
e
gi
eerusegreatcarei
a
ticipati
galltheprobableloadstowhichastructurewillbesubjectedduri
gitslifetime
Althoughthedesig
ofmostmembersisco
trolledtypicallybydeada
dliveloadacti
gsimulta
eouslyco
sideratio
mustalsobegive
totheforcesproducedbywi
dimpactshri
kagetemperaturecha
gecreepa
dsupportsettleme
tsearthquakea
dsoforth
Theloadassociatedwiththeweightofthestructureitselfa
ditsperma
e
tcompo
e
tsiscalledthedeadloadThedeadloadofco
cretememberswhichissubsta
tialshould
everbe
eglectedi
desig
computatio
sTheexactmag
itudeofthedeadloadis
otk
ow
accuratelyu
tilmembershavebee
sizedSi
cesomefigureforthedeadloadmustbeusedi
computatio
stosizethemembersitsmag
itudemustbeestimatedatfirstAfterastructurehasbee
a
alyzedthememberssizeda
darchitecturaldetailscompletedthedeadloadca
becomputedmoreaccuratelyIfthecomputeddeadloadisapproximatelyequaltothei
itialestimateofitsvalueorslightlylessthedesig
iscompletebutifasig
ifica
tdiffere
ceexistsbetwee
thecomputeda
destimatedvaluesofdeadweightthecomputatio
sshouldberevisedusi
ga
improvedvalueofdeadloadA
accurateestimateofdeadloadis
第96页
f青岛理工大学毕业设计（论文）
particularlyimporta
twhe
spa
sarelo
gsayover75ft229mbecausedeadloadco
stitutesamajorportio
ofthedesig
load
Liveloadsassociatedwithbuildi
gusearespecificitemsofequipme
ta
doccupa
tsi
acertai
areaofabuildi
gbuildi
gcodesspecifyvaluesofu
iformliveforwhichmembersaretobedesig
ed
Afterthestructurehasbee
sizedforverticalloaditischeckedforwi
di
combi
atio
withdeada
dliveloadasspecifiedi
thecodeWi
dloadsdo
otusuallyco
trolthesizeofmembersi
buildi
glesstha
16to18storiesbutfortallr