Beton Bertulang 1 - Momen Nominal

b=300mm

ɛc
c=90.54m
m

a=76.961mm

Cc

d=560mm

h=600mm

Ts

ɛs

b=300mm

fc’=30mpa

h=600mm

fy=400mpa

d=560mm

ɛc=0.003

As= 3 D-25 = 1471,875 mm2

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

beff
tf

h

bw

beff=500mm

As= 6 D-25 = 2943.75 mm2

tf=125mm

fc’=20mpa

h=700mm

fy=400mpa

d=610mm

ɛc=0.003

bw=250mm

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

ɛc

0,85fc’

c

a

Cc

d

h=b

Jd
Ts

ɛs
b

b=400mm

fc’=14.4mpa

h=400mm

fy=457mpa

d=350mm

ɛc=0.003

As= 3 D-20 = 3768 mm2
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