resses in the two bars are (for AT < 14.5°) σ = 2000 psi σ = 0 psi S ure increases greater than AT> 14.5", the stresses are given by stresses are shown in the graph of Fig. 5-18e. Positive stresses sion in bar A and compression in bar B (as assumed on the free-body d negative stresses represent compression in bar A and tension is ite what was assumed on the free-body diagrams). The normal stresses in the concrete and in the steel bars after the temperature increases b. The change in length of the pier resulting from the combined effects of the temperature change and the load 10 in 10 in Try ers Do- win. ther the те shown in Fig. P5-61. If end supports are rigid and the bar is stress free at 0°F, determine a. The normal stress in both parts of the bar at 80°F b. The change in diameter of the steel part of the bar c. The displacement of the rigid plate. Rigid plate- Aluminum Steel E Figure P5-61 30 in 20in 5-62 A steel tie rod containing a rigid turnbuckle (Fig. P5-62) has its end attached to rigid walls. During the summer, whet the temperature is 30°C, the turnbuckle is tightened to produce a stress in the rod of 15 MPa. Determine the normal stress in the rod in the winter when the temperature is -10°C. Use 200 GPa and a 11.9 (10 y C. Figure PS-63 P-150 kip Rigid cap 24 in 564 The 50-mm-diameter circular steel [E=200 GPa, and 119(10-y"C] bar shown in Fig. P5-64 is subjected to an axial load of P100 kN. After the load is applied, the temperature decreases 20°C. Determine the normal stress in segments AB and BC of the bar. the Figure P5-62 .00 C. rod 600 steel Intermediate Problems 5-63 Nine 34-in-diameter steel (E-30,000 ksi) reinfor ing bars were used when the short concrete (E-4500 ksi) pier shown in Fig. PS-63 was constructed. After a load P of 150 kip was applied to the pier, the temperature creased 100F. The coefficients of thermal expansion for sel and concrete are 6.6(10 yF and 6.0(10yF, respectively Determine Figure P5-64 200 mm 200 mm F S 545 A rigid block of negligible weight is suspended by three wires, as shown in Fig. PS-65. Wires Bare steel (E29,000 *-6610F, and 10.25 in 1, and wire C is aluminum the temperature rises 50°F, determine the normal stress in cach E-10,600 ksi, a wire. 12.5(10 F, and 4-0.50 in.) If S