This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Sec_2.7.qxd 9/25/08 202 11:42 AM Page 202 CHAPTER 2 Axially Loaded Members At the proportional limit: At the proportional limit:
u modulus of resistance uR s2
PL uR uW s2
2gE (Eq. 2) (Eq. 1) 2E RESULTS STRAIN ENERGY PER UNIT WEIGHT
2EA U Weight W gAL weight density 22
150 Mild steel
Rubber (soft) uw (in.)
W uW uR (psi) Problem 2.7-6 The truss ABC shown in the figure is subjected to a horizontal
load P at joint B. The two bars are identical with cross-sectional area A and modulus
of elasticity E.
(a) Determine the strain energy U of the truss if the angle
(b) Determine the horizontal displacement B of joint B by equating the strain
energy of the truss to the work done by the load. Solution 2.7-6 Truss subjected to a load P 13/2 cos 1/2 LAB LBC L FREE-BODY DIAGRAM OF JOINT B Fvert 0 FAB sin
FAB ↓ FBC sin 0 FBC (Eq. 1) 0:← Fhoriz
FAB ↓ sin b 60° FBC FBC cos P P
2 cos b P
P (Eq. 2) ...
View Full Document
This note was uploaded on 12/22/2011 for the course MEEG 310 taught by Professor Staff during the Fall '11 term at University of Delaware.
- Fall '11