Page 319 - Civil Engineering Formulas

BRIDGE AND SUSPENSION-CABLE FORMULAS 253

Q 25,000 for L
130 (10.21)
A 0.75L 1.8Q r
1 0.25 sec
2r B EA
L
Q Q
27,000 80 max 23,000 (10.22)
A r A
Q
P
1.8 (10.23)
A A
When the column ends are pinned,
L
Q 2 up to L
20,000 0.61 130 (10.24)
A r r
Q 25,000 for L
130 (10.25)
A 0.875L 1.8Q r
1 0.25 sec
2r B EA
P
Q
1.8 (10.26)
A A
For structural nickel steel with S 55,000 psi, using structural shapes, or
y
being fabricated with column ends being riveted,
Q 2 up to L
L
24,000 0.66 120 (10.27)
A r r
Q 30,000 for L
120 (10.28)
A 0.75L 1.83Q r
1 0.25 sec
2r B EA
P
Q
1.83 (10.29)
A A
L
Q
24,000 98 (10.30)
A r
When the column ends are pinned,
L
Q 2 up to L
24,000 0.86 120 (10.31)
A r r
Q 30,000 for L
120 (10.32)
A 0.875L 1.83Q r
1 0.25 sec 2r B EA
P
Q
1.83 (10.33)
A A