struktur beton 1
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STRUKTUR BETON 1PERTEMUAN 2
DASAR PERENCANAAN BALOK BETON BERTULANG
Oleh :Arwan Apriyono
PROGRAM STUDI TEKNIK SIPIL JURUSAN TEKNIK FAKULTAS SAINS DAN TEKNIK UNSOED
TAHUN 2009
University of Michigan, TCAUP Structures II
Slide 2/26
Allowable Stress – WSD (ASD)
Actual loads used to determine stress Allowable stress reduced by factor of safety
Ultimate Strength – (LRFD) Loads increased depending on type load
g Factors: DL=1.4 LL=1.7 WL=1.3U=1.4DL+1.7LL
Strength reduced depending on type force
f Factors: flexure=0.9 shear=0.85 column=0.7
failureactual FSFf .).(
nu MM f
Examples:
WSD
Ultimate Strength
'1.0 cv ff
'45.0 cb ff
nu MM 9.0
nu VV 85.0
nu PP 70.0
Hal yang perlu diperhatikan pada perencanaan balok beton bertulang :
a. Kombinasi beban yang ada pada strukturb. Analisis struktur (Menghasilkan Mu dan Vu)c. Properties Beton dan Baja Tulangan (f’c dan fy)d. Konsep Perencanaan Balok Beton Bertulang
Item Perencanaan
Kombinasi Beban
Kombinasi Beban
Analisis Struktur
ANALISIS STATIS TERTENTU
ANALISIS STATIS TAKTENTU
DAPAT DIGUNAKAN BANTUAN SOFTWARE: AXIS, ANXIS, SAP, ETAB ETC
University of Michigan, TCAUP Structures II
Slide 7/26
Strength Measurement
Compressive strength› 12”x6” cylinder› 28 day moist cure› Ultimate (failure) strength
'cf
Photos: Source: Xb-70 (wikipedia)
Properties Beton
Properties Beton
Properties Beton
Properties Beton
Properties Beton
Properties Baja
Properties Baja
KURVA HUBUNGAN TEG-REG BAJA
Properties Baja
UKURAN BAJA TULANGAN
Konsep Perencanaan
University of Michigan, TCAUP Structures II
Slide 16/26
Failure Modes
No Reinforcing› Brittle failure
Reinforcing < balance› Steel yields before concrete fails› ductile failure
Reinforcing = balance› Concrete fails just as steel yields
Reinforcing > balance› Concrete fails before steel yields› Sudden failure
bdAs
yf200
min
yy
cbal ff
f870008700085.0 '
1
bal 75.0max
!h!SuddenDeatmax
Source: Polyparadigm (wikipedia)
Konsep Perencanaan
Konsep Perencanaan
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