6–41. Draw the influence line for the force in member JE.
SOLUTION
A
LK JIH
BCDE FG
8 ft8 ft8 ft8 ft8 ft8 ft
8 ft
6–42. Draw the influence line for the force in member IJ.
SOLUTION
LKJIH
BC
D
E
F
G
A
8 ft 8 ft 8 ft 8 ft 8 ft 8 ft
6 ft
6–43. Draw the influence line for the force in member DI.
SOLUTION
LKJIH
BC
D
E
F
G
A
8 ft 8 ft 8 ft 8 ft 8 ft 8 ft
6 ft
270
*6–44. Draw the influence line for the force in member EF.
SOLUTION
LKJIH
BC
D
E
F
G
A
8 ft 8 ft 8 ft 8 ft 8 ft 8 ft
6 ft
6–45. Draw the influence line for the force in (a) member EF
and (b) member CE.
SOLUTION
BC
D
E
F
G
A
3 m 3 m 3 m 3 m 3 m 3 m
4
m
SOLUTION
6–46. Draw the influence line for the force in member BF.
BC
D
E
F
G
A
3 m 3 m 3 m 3 m 3 m 3 m
4
m
6–47. Draw the influence line for the force in member BC.
SOLUTION
BC
D
E
F
G
A
3 m 3 m 3 m 3 m 3 m 3 m
4
m
274
SOLUTION
*6–48. Draw the influence line for the force in member BC of
the Warren truss. Indicate numerical values for the peaks. All
members have the same length.
GFE
A
BC
D
608608
20 ft 20 ft 20 ft
6–49. Draw the influence line for the force in (a) member KJ
and (b) member CJ.
SOLUTION
A
LK JIH
BCDEF
G
6 ft6 ft6 ft6 ft6 ft6 ft
8 ft
6–51. Draw the influence line for the force in member RQ
of the Baltimore truss.
A
BCDE FGHI
T
W
SRQP
ONV
JKL
M
12 @25 ft 5 300 ft
25 ft
25 ft
278
6–53. Draw the influence line for the force in member NP
of the Baltimore truss.
SOLUTION
A
BCDE FGHI
T
W
SRQP
ONV
JKL
M
12 @25 ft 5 300 ft
25 ft
25 ft
SOLUTION
6–54. Draw the influence line for the force in member RN
of the Baltimore truss.
A
BCDE FGHI
T
W
SRQP
ONV
JKL
M
12 @25 ft
5
300 ft
25 ft
25 ft
6–55. Draw the influence line for the force in member NG
of the Baltimore truss.
A
BCDE FGHI
T
W
SRQP
ONV
JKL
M
12 @25 ft
5
300 ft
25 ft
25 ft
282
SOLUTION
*6–56. Draw the influence line for the force in member CO
of the Baltimore truss.
A
BCDE FGHI
T
W
SRQP
ONV
JKL
M
12 @25 ft 5 300 ft
25 ft
25 ft
6–57. Draw the influence line for the force in member CD.
SOLUTION
LKJIH
G
FEDCB
A
6 ft 6 ft 6 ft 6 ft 6 ft 6 ft
6 ft
SOLUTION
6–58. Draw the influence line for the force in member CJ.
LKJIH
G
FEDCB
A
6 ft 6 ft 6 ft 6 ft 6 ft 6 ft
6 ft
6–59. Draw the influence line for the force in member HC,
then determine the maximum live force (tension or
compression) that can be developed in this member due to a
uniform live load of 800 lb>ft that acts on the bridge deck along
the bottom cord of the truss.
A
BCD
E
HG F
20 ft 20 ft 20 ft 20 ft
20 ft
