Question
Asked Oct 13, 2019
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6.5 INFL
EXAMPLE 6.15
es
Draw the influence line for the force in member GB of the bridge truss
ce
he
shown in Fig. 6-24a.
FH
F
he
H
re
by
he
6 m
FB
E
|D
A
B
ad
6 m
6 m
6 m
ce
6 m
0.25
ve.
(a)
0.75
nd
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6.5 INFL EXAMPLE 6.15 es Draw the influence line for the force in member GB of the bridge truss ce he shown in Fig. 6-24a. FH F he H re by he 6 m FB E |D A B ad 6 m 6 m 6 m ce 6 m 0.25 ve. (a) 0.75 nd

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Expert Answer

Step 1

Free body diagram of the truss member is given below

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6 m FGB 6 m A B RA RB 24 m X

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Step 2

Influence line diagram will be drawing by applying unit load at each node from A to E and force in member GB will be calculated

Calculation of reaction at support

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ΣΜ,-0 Rx24-x(24-x)= 0 (24-x) 24 Χ R 1 24

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Step 3

When the unit load is in betwe...

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6 m FGB 6 m A B RA X Here component of Fos in vertical direction is GB when Σ-0 R+FGB cose-1- 0 + Feg Cose=1 24 6 FGB 62 24 x X GB 24 - When x = 0, F68 = 0 x=6 m, F6 -x6 0.353 24 -

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