g g g
SOLUTION MANUAL
g
, P2.1.gDeterminegthegdeadweightgofgag1-ft- 72ʺ
longgsegmentgofgthegprestressed,greinforcedgcon 6ʺ
cretegtee- 6ʺ
beamgwhosegcrossgsectiongisgshowngingFigure 48ʺ 8ʺ 24ʺ
gP2.1.gBeamgisgconstructedgwithglightweightgc
3
oncretegwhichgweighsg120glbs/ft . 12ʺ
18ʺg
Section
P2.1
3
Computegthegweight/ft.gofgcrossgsectiong@g120glb/ft .
Computegcrossgsectionalgarea:
æ 1g ög
Areag =g(0.5¢´6¢)+g2 ç ´0.5¢´2.67¢÷ +(0.67¢´2.5¢)+(1.5¢´1¢)
çg2 ÷
è ø
=g7.5gft2
Weightgofgmembergpergfootglength:
wt/ftg=g7.5gft2g´120glb/ft3g= 900glb/ft.
2-2
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Nog reproductiong org distributiong withoutg theg priorg writteng consentg ofg McGraw-Hillg Education.
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, P2.2.gDeterminegthegdeadweightgofgag1-ft- threegplygfel
2ʺginsulation 3/4ʺgplywood
tg targandggra
longgsegmentgofgagtypicalg20-in- vel
widegunitgofgagroofgsupportedgongagnominalg2g×g16
gin.gsoutherngpine
beamg(thegactualgdimensionsgareg 2g1g in.gsmaller).
2
Thegg3g-in.g plywoodgweighsg3glb/ft . 1g1/2ʺ 15g1/2ʺ
4
20ʺ 20ʺ
Section
P2.2
SeegTableg2.1gforgweightsg
wtg/20¢¢gunitg
20¢¢g
Plywood:g 3g psf´ ´1¢g=g5g lb
12
20¢¢g
Insulation:g3gpsfg´ ´1¢g=g5glb
12
20¢¢g g9.17glbg
Roof’ggTarg&gG:g5.5gpsfg´ ´1¢g=g
12 19.17glb
lbg (1.5¢¢ ´15.5)¢¢ g
´1¢g=g5.97glb
WoodgJoistg=g3 3
ft 14.4g in2/gft3
7
Totalgwtgofg20¢¢gunitg=g19.17g+g5.97
= 25.14glb.gAns.
2-3
Copyrightg ©g 2018g McGraw-Hillg Education.g Allg rightsg reserved.
Nog reproductiong org distributiong withoutg theg priorg writteng consentg ofg McGraw-Hillg Education.
@seismicisolation
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, P2.3.gAgwidegflangegsteelgbeamgshowngingFiguregP2
.3gsupportsgagpermanentgconcretegmasonrygwall,gfloo
8ʺgconcretegmasonry
rgslab,garchitecturalgfinishes,gmechanicalgandgelectr partition
icalgsystems.gDeterminegtheguniformgdeadgloadgingk
9.5ʹ
ipsgperglineargfootgactinggongthegbeam. concretegfloorgslab
Thegwallgisg9.5-ftghigh,gnon-
loadgbearinggandglaterallygbracedgatgthegtopgtogup
pergfloorgframingg(notgshown).gThegwallgconsistsgo
fg8- piping
in.glightweightgreinforcedgconcretegmasonrygunitsg mechanical
duct
withgangaveragegweightgofg90gpsf.gThegcompositegc widegflangegsteel
oncretegfloorgslabgconstructiongspansgovergsimplyg beamgwithgfireproofing
supportedgsteelgbeams,gwithgagtributarygwidthgofg g ceilinggtilegandgsuspensionghangers
10gft,gandgweighsg50gpsf. Section
Thegestimatedguniformgdeadgloadgforgstructural P2.3
gsteelgframing,gfireproofing,garchitecturalgfeatures,
gfloorgfinish,gandgceilinggtilesgequalsg24gpsf,gandgfo
rgmechanicalgducting,gpiping,gandgelectricalgsyste
msgequalsg6gpsf.
UniformgDeadgLoadgWDLg ActinggongthegWidegFlangegBeam:
Wallg Load:
9.5¢(0.09gksf)g=g0.855gklfgFl
oorgSlab:
10¢(0.05g ksf)g =g0.50g klf
SteelgFrmg,gFireproof’g,gArch’lgFeatures,gFloorgFinishes,g&gCeiling:g
10¢(0.024gksf)g=g0.24gklf
Mech’l,gPipingg&gElectricalgSystems:g10¢(0.00
6g ksf)g=g0.06g klf
TotalgWDLg =g1.66gklf
2-4
Copyrightg ©g 2018g McGraw-Hillg Education.g Allg rightsg reserved.
Nog reproductiong org distributiong withoutg theg priorg writteng consentg ofg McGraw-Hillg Education.
@seismicisolation
@seismicisolation