Page 175 - Demo
P. 175
(0.25)×(500+550+450)+(10.75)×(1,500+1,800+1,200)+(21.25)×(400+500+300) y′= m
7, 200
(0.25)×(1,500)+(10.75)×(4,500)+(21.25)×(1,200) y′= m
7,200
y′ = 375 + 48,375 + 25,500 m 7,200
y′=74,250 m 7,200
y′=10.31 m จะได้
21.5 2
ey=−0.44 m ดังน้ัน
Mx =Q.ey
Mx =7,200×(−0.44) kN.m
Mx = −3,168 kN.m และ
Ix = 1 B3L 12
Ix = 1 (21.5)3 (21.5) 12
Ix =17,806.26 m4
166
ey =y′−
ey =10.31−
m
B 2
