Beton Bertulang 1 - Momen Nominal

b=300mm h=600mm d=560mm

As= 3 D-25 = 1471,875 mm2

fc’=30mpa fy=400mpa

ɛc=0.003

Cc=Ts

0.85fc’ab=AsFs

a=AsFs/0.85fc’b= 76,961mm

a=β1.c

c=a/β1=90,5421mm

ɛs=(d-c)/c * ɛc =0.0156

fs= ɛs Es= 3110,981mpa

Cc=0.85fc’ab=588.75 mm2 mpa

Mn=Ts Jd = Cc Jd = 588.75 x (560-1/2*76.961)=307044.6691 mm3 mpa

b=300mm

h=600mm d=560mm

c=90.54m m

a=76.961mm

ɛc

ɛs

Cc

beff=500mm

tf=125mm

h=700mm

d=610mm

bw=250mm

As= 6 D-25 = 2943.75 mm2

fc’=20mpa

fy=400mpa

ɛc=0.003

Cf+Cw=Ts

0.85fc’tf (beff-bw) + 0.85fc’ a b = AsFy

a=136.053mm

a=β1.c

c=a/β1=160.0619195mm

ɛs=(d-c)/c * ɛc = 0.008433

fs= ɛs Es= 0.008433 x 200000=…… mpa

Mn=Cw(d – a/2) + Cf (d – tf/2) = 314545457.9 mm3 mpa

bw h

tf

b=400mm

h=400mm

d=350mm

As= 3 D-20 = 3768 mm2

fc’=14.4mpa

fy=457mpa

ɛc=0.003

Cc=Ts

0.85fc’ab=AsFs

a=AsFs/0.85fc’b=3768x457/0.85x14.4x400=230mm

a=β1.c

c=a/β1=271mm

ɛs=(d-c)/c * ɛc = (350-271)/271 * 0.003 = 0.001

fs= ɛs Es= 0.001 x 200000=174 mpa

Cc=0.85fc’ab=0.85x14.4x230x230=653967,3

Ts=As.Fs=3768x174=653967,3

Mn=Ts Jd = Cc Jd = 653967,3 x (350-1/2*230)=153682315.5

h=b

b

d

ɛ

c

ɛ

s

c

0,85fc’

a Cc