Redundancy analysis - Computational Analysis and Design of Bridge Structures - page 467

Table 15.2 Redundancy analysis
Design alternates

Structural elements Code checks

All basic uncut designs Main truss Dead load conditions

Members Live load maxima

Gusset plates Tension allowables

Connections Column compression

Fatigue (stress range)

All basic cut designs Cross beams Nonfatigue

supports Secondary stresses

Half-truss stability
Redundancy
Deflections

7 10

6

11

8

9

4

6 5

5 12

4 13

3 1

14

2 1

2 16 15 3

Local coordinate
number

Local coordinate Local coordinate

number

Local coordinate

1 (− dx ,− d 2,0)
2 (− bf 1,− d 2, tf )
3 (− bf 1−0.00001,− d 2,0)
4 (− bf 1−0.00001,0, tw )
5 (− bf 1,0,0)
6 (− bf 1, d 2, tw )
7 ( bf 1−0.00001, d 2,0)
8 (− dx , d 2, tf )
9 ( dx , d 2,0)
10 ( bf 1, d 2, tf )
11 ( bf 1+0.00001, d 2,0)
12 ( bf 1+0.00001,0, tw )
13 ( bf 1,0,0)
14 ( bf 1,− d 2, tw )
15 ( bf 1,− d 2−0.00001,0)
16 ( dx ,− d 2−0.00001, tf )
(a) Bottom chord double-channel section

1 (− d 2, bf 2,0)

2 (− d 2,− bf 2, tf )

3 (− d 2,0,0)

4 ( d 2,0, tw )

5 ( d 2, bf 2,0)

6 ( d 2,− bf 2, tf )

(b) Diagonal wide flange section

Figure 15.5 (a, b) Plastic section definition of FCMs.