2.28. The three bars shown in Fig. 2-45 support the vertical load of 5000 lb. The bars are all stress free and joined by the pin at A before the load is applied. The load is put on gradually and simultaneously the temperature of all three bars decreases by 15°F. Calculate the stress in each bar. The outer bars are each brass and of cross-sectional area 0.4 in². The central bar is steel and of area 0.3 in². For brass E = 13× 10° lb/in² and a = 10.4 × 10°F and for steel E = 30 × 10° lb/in² and a = 6.3 × 10¯/°F. Ans. σ = 3550 lb/in², σ = 10,000 lb/in² 45 ए 5000 lb Fig. 2-45 6 1 1
2.28. The three bars shown in Fig. 2-45 support the vertical load of 5000 lb. The bars are all stress free and joined by the pin at A before the load is applied. The load is put on gradually and simultaneously the temperature of all three bars decreases by 15°F. Calculate the stress in each bar. The outer bars are each brass and of cross-sectional area 0.4 in². The central bar is steel and of area 0.3 in². For brass E = 13× 10° lb/in² and a = 10.4 × 10°F and for steel E = 30 × 10° lb/in² and a = 6.3 × 10¯/°F. Ans. σ = 3550 lb/in², σ = 10,000 lb/in² 45 ए 5000 lb Fig. 2-45 6 1 1
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:2.28. The three bars shown in Fig. 2-45 support the vertical load of 5000 lb. The bars are all stress free and joined
by the pin at A before the load is applied. The load is put on gradually and simultaneously the temperature
of all three bars decreases by 15°F. Calculate the stress in each bar. The outer bars are each brass and of
cross-sectional area 0.4 in². The central bar is steel and of area 0.3 in². For brass E = 13× 10° lb/in² and
a = 10.4 × 10°F and for steel E = 30 × 10° lb/in² and a = 6.3 × 10¯/°F.
Ans. σ = 3550 lb/in², σ = 10,000 lb/in²
45
ए
5000 lb
Fig. 2-45
6
1
1
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