STRUKTUR BETON 1 PERTEMUAN 2 DASAR PERENCANAAN BALOK BETON BERTULANG Oleh : Arwan Apriyono PROGRAM STUDI TEKNIK SIPIL JURUSAN TEKNIK FAKULTAS SAINS DAN TEKNIK UNSOED TAHUN 2009

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=1.3 U=1.4DL+1.7LL Strength reduced depending on type force f Factors: flexure=0.9 shear=0.85 column=0.7 Examples: WSD Ultimate Strength University of Michigan, TCAUP Structures II Slide 2/26

Item Perencanaan Hal yang perlu diperhatikan pada perencanaan balok beton bertulang : Kombinasi beban yang ada pada struktur Analisis struktur (Menghasilkan Mu dan Vu) Properties Beton dan Baja Tulangan (f’c dan fy) Konsep Perencanaan Balok Beton Bertulang

Kombinasi Beban

Kombinasi Beban

Analisis Struktur ANALISIS STATIS TERTENTU ANALISIS STATIS TAKTENTU DAPAT DIGUNAKAN BANTUAN SOFTWARE: AXIS, ANXIS, SAP, ETAB ETC

Strength Measurement Properties Beton Compressive strength 12”x6” cylinder 28 day moist cure Ultimate (failure) strength Both photos http://commons.wikimedia.org/wiki/File:Failed_Concrete_Cylinder.jpg Original uploader was Xb-70 at en.wikipedia Released into the public domain (by the author). Photos: Source: Xb-70 (wikipedia) University of Michigan, TCAUP Structures II Slide 7/26

Properties Beton

Properties Beton

Properties Beton

Properties Beton

Properties Baja

KURVA HUBUNGAN TEG-REG BAJA Properties Baja KURVA HUBUNGAN TEG-REG BAJA

Properties Baja UKURAN BAJA TULANGAN

Konsep Perencanaan

Failure Modes No Reinforcing Reinforcing < balance 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 Source: Polyparadigm (wikipedia) http://commons.wikimedia.org/wiki/File:Burst_column.JPG public domain (Seismic test column displayed outside UCSD's w:structures laboratory. w:Concrete has burst, exposing w:rebar and w:aggregate (composite). {{PD-user-en|Polyparadigm}}) University of Michigan, TCAUP Structures II Slide 16/26

Konsep Perencanaan

Konsep Perencanaan