171_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 171_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Sec_2.5.qxd 9/25/08 3:00 PM Page 165 SECTION 2.5 Thermal Effects (b) DISPLACEMENTS AT B & C use superposition of displacements in the two released structures a ¢ T1 L12 dB RA a L1 b E A1 a ¢ T 1 L12 [ s + a ¢ T1 L1 + L22] dB L1 L2 1 + + E A1 E A2 k3 ; a¢ T1 L1 + L22 dC RAa dC L1 L2 + b E A1 E A2 ; a ¢ T1 L1 + L22 [ a 165 s + a ¢ T1 L1 + L22] L1 L2 1 + + E A1 E A2 k3 L1 b E A1 a L1 L2 + b E A1 E A2 Problem 2.5–17 Wires B and C are attached to a support at the left-hand end and to a pin-supported rigid bar at the right-hand end (see figure). Each wire has cross-sectional area A 0.03 in.2 and modulus of elasticity E 30 106 psi. When the bar is in a vertical position, the length of each wire is L 80 in. However, before being attached to the bar, the length of wire B was 79.98 in. and of wire C was 79.95 in. Find the tensile forces TB and TC in the wires under the action of a force P 700 lb acting at the upper end of the bar. 700 lb B b C b b 80 in. Solution 2.5–17 Wires B and C attached to a bar EQUILIBRIUM EQUATION Mpin TC(b) 2TB P 700 lb A 0.03 in.2 E 30 106 psi LB 79.98 in. LC 79.95 in. 0 TB(2b) TC 3P ; P(3b) (Eq. 1) ...
View Full Document

Ask a homework question - tutors are online