Gambarkan diagram beban , diagram geser, Diagram lentur, Diagram momen puntir, Lingkaran Mohr pada 4 point bending.
1.
Gambarkan
diagram beban , diagram geser,
Diagram
lentur, Diagram momen puntir,
Lingkaran
Mohr pada 4 point bending.
|
D
|
dan
tegangan geser (τ) maksimalnya
|
RA
|
|
RB
|
|
C
|
|
A
|
|
B
|
mencari reaksi pembebanan di A dan B
ΣMA=0
10 m x RB = (3 m x 20 KN) + ( 7 x 20 )
RB
= 60 + 140 KN.m / 10 m
= 20 KN
ΣMB
= 0
10 m x RA = (3 m x 20 KN) + ( 7 x
20 )
RA
= 60 + 140 KN.m / 10 m
= 20 KN
Menggambar diagram geser
VA = RA = 20 KN
VB = VA + (– 20) = 20 - 20 KN = 0
VC = 0 + (-20) = - 20 KN
VD = -20 + RB = - 20 + 20 = 0 KN
Menggambar diagram momen lentur
MA = 0
MB = MA + (nilai diagram geser AB x jarak AB )
= 0 + (
20 x 3 ) = 60 KN.m
MC = MB + ( nilai diagram geser BC x jarak BC )
= 60 +
(0 KN x 4 m)
= 60
KN.m
MD = MC + ( nilai diagram geser CD x jarak CD )
= 60
KN + ( - 20 KN x 3 m )
= 0 KN
.m
