Matakuliah
Tahun
: S0084 / Teori dan Perancangan Struktur Beton
: 2007
PENULANGAN LENTUR KOLOM BIAKSIAL
Pertemuan 20
Learning Outcomes
Mahasiswa akan dapat mendesign penulangan
lentur kolom biaksial
Bina Nusantara
Outline Materi
•
•
Bina Nusantara
Diagram Ineraksi
Metode Bresler
KOLOM BIAXIAL
• Kolom yang mengalami Momen dalam dua arah yang
tegak lurus ( Mx dan My)
Bina Nusantara
KOLOM BIAXIAL
Unaxial bending about
y-axis
Bina Nusantara
KOLOM BIAXIAL
The biaxial bending moments
Mx = P*ey
My = P*ex
Bina Nusantara
METODE PENDEKATAN
Bina Nusantara
METODE PENDEKATAN
P0 = Axial Load Strength under pure axial compression
(corresponds to point C ) Mnx = Mny = 0
P0x = Axial Load Strength under uniaxial eccentricity, ey
(corresponds to point B ) Mnx = Pney
P0y = Axial Load Strength under uniaxial eccentricity, ex
(corresponds to point A ) Mny = Pnex
Bina Nusantara
METODE PENDEKATAN
Design: Pu Muy, Mux
Bina Nusantara
Pu, Puex, Puey
METODE PENDEKATAN
1
Pn

1
Pn
 Pn 
1


P0x
1
P0x

1

P0y
1
1
P0y

1
P0
1
P0
Pn = Nominal axial load strength at eccentricities, ex & ey
Limited to cases when
Bina Nusantara
Pn  0.1 f c Ag
TAHAPAN PERENCANAAN
Analysis Procedure: Reciprocal Load Method
Bresler’s Formula:
1
Steps:
Pn

1
P0x

1
P0y
1

P0
1) Calculate P0
2) Calculate P0y ( Pn for e = ex, ey = 0 )
3)Calculate P0x ( Pn for ex= 0, e = ey )
4) Calculate Pn (from Bresler’s Formula )
Bina Nusantara
TAHAPAN PERENCANAAN
Pu   Pn
Bina Nusantara