Problem 3 3, Nine 4 "diameter steel (Est = 30,000ksi) reinforcing bars were used when the short concrete (Ec = 4500ksi) pier was constructed. After a load P of 150 kip was applied to the pier, the temperature increased 100°F. The coefficients of the thermal expansion for steel and concrete are 6.6 x 10-6/ °F and 6.0x 10-6/ °F, respectively. Determine: (1) The normal stresses in the concrete and in the steel bars after the temperature increases (2) The change in length of the pier resulting from the combine effects of the temperature change and the load. (3) Can we change steel bar to aluminum bar (12.5 × 10-6/ °F) to reduce the cost of reinforcement? Use one sentence to explain your thoughts, no need to calculateⒸ 10 in. O C 10 in. P = 150 kip Rigid cap 24 in.
Problem 3 3, Nine 4 "diameter steel (Est = 30,000ksi) reinforcing bars were used when the short concrete (Ec = 4500ksi) pier was constructed. After a load P of 150 kip was applied to the pier, the temperature increased 100°F. The coefficients of the thermal expansion for steel and concrete are 6.6 x 10-6/ °F and 6.0x 10-6/ °F, respectively. Determine: (1) The normal stresses in the concrete and in the steel bars after the temperature increases (2) The change in length of the pier resulting from the combine effects of the temperature change and the load. (3) Can we change steel bar to aluminum bar (12.5 × 10-6/ °F) to reduce the cost of reinforcement? Use one sentence to explain your thoughts, no need to calculateⒸ 10 in. O C 10 in. P = 150 kip Rigid cap 24 in.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Problem 3
3
Nine diameter steel (Est = 30,000ksi) reinforcing bars were used when the short
4
concrete (Ec 4500ksi) pier was constructed. After a load P of 150 kip was applied to the
pier, the temperature increased 100°F. The coefficients of the thermal expansion for steel
and concrete are 6.6 × 10-6/ °F and 6.0× 10-6/ °F, respectively. Determine:
(1) The normal stresses in the concrete and in the steel bars after the temperature
increases
(2) The change in length of the pier resulting from the combine effects of the
temperature change and the load.
(3) Can we change steel bar to aluminum bar (12.5 × 10-6/ °F) to reduce the cost of
reinforcement? Use one sentence to explain your thoughts, no need to calculateⒸ
=
10 in.
0.0
10 in.
P = 150 kip
Rigid cap
24 in.
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