Use LRFD and choose a pipe to be used as a tension member to resist a service dead load of 10 kips and service live load of 25 kips. The ends will be connected by welding completely around the circumference of the pipe. The length is 8 feet.

see explanation

Explanation:

By load resistance and factor design:

calculate factored load using following load combination

is factored load

D is dead load

L is live load

Substitute 10kips for D and 25kips for L

Calculate the required gross area 0f the member

is gross area of section

is yield strength

substitute 52kips for and 35kips for

Calculate required effective area of the member

is the effective area

is the ultimate strength

substitute 52kips for and 60ksi for

Calculate minimum value for radius of gyration

Corresponding to the above calculated value, try pipe 3 standard

For pipe 3 standard

Check the above section requirement

Calculate effective net area of the section

therefore the section is OK

Hence , use pipe 3 standard

answer( sicar );