CIVIL ENGINEERING FORMULAS

BRIDGE AND SUSPENSION-CABLE FORMULAS 253

(10.21)

(10.22)

(10.23)

When the column ends are pinned,

(10.24)

(10.25)

(10.26)

For structural nickel steel with Sy55,000 psi, using structural shapes, or
being fabricated with column ends being riveted,

(10.27)

(10.28)

(10.29)

(10.30)

When the column ends are pinned,

(10.31)

(10.32)

(10.33)

P

A

1.83

Q

A

Q

A



30,000

1 0.25 sec

0.875L

2 r B

1.83Q

EA 

for

L

r

120

Q

A

24,0000.86

L

r

2

up to

L

r

 120

Q

A

24,000 (^98) 

L

r

P

A

1.83

Q

A

Q

A



30,000

1 0.25 sec

0.75L

2 r B

1.83Q

EA 

for

L

r

120

Q

A

24,0000.66

L

r

2

up to

L

r

 120

P

A

1.8

Q

A

Q

A



25,000

1 0.25 sec

0.875L

2 r B

1.8Q

EA

for

L

r

130

Q

A

20,0000.61

L

r

2

up to

L

r

 130

P

A

1.8

Q

A

Q

A

27,000 (^80) 

L

r

max

Q

A

23,000

Q

A



25,000

1 0.25 sec

0.75L

2 r B

1.8Q

EA 

for

L

r

130