plastic design for slab using yield line analysis link for video You tube: Civil engineering 4 free

1. L

L
W
Design moment ?
How to determine Design moment for
aSquare slab using Yield lineAnalysis?

2. L

L
/ 2
L / 2
L
/ 2


Internal Energy = External Energy
Internal Energy = Moment * rotation * length of projected yield line
External Energy =Area * Load * Average moved distance for each right half slab
W
/ 2


/ 2
L
/ 2
L

3. L

L
/ 2
L / 2
L
/ 2


W
/ 2


Internal Energy = Moment * rotation * length of projected yield line
?
?
/ 2


/ 2
L

2 / 2
tan
L
 

2 2 / 2
small angle, tan
L
For  



2 / 2
L
 

4
L
 

4
Internal Energy * )
(M * *2
L
L



Internal Energy 8M
 

4. L

L
/ 2
L / 2
L
/ 2


W
/ 2



External Energy =Area * Load * Average moved distance for each right half slab
2
External E [(0.5* * ) * ( ) * ( )]*4
3
nergy L
L W
 

Average moved distance for each triangle=
3

2
3
External Energy WL


5. L

L
/ 2
L / 2
L
/ 2


W
/ 2



Internal Energy = External Energy
2
8M
3
WL
 
 
2
24
M WL
