210_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

210_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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204 CHAPTER 2 Axially Loaded Members (c) L OADS P 1 AND P 2 ACT SIMULTANEOUSLY U 3 ± 1 2 EA c ( F AB ) 2 L AB + ( F BC ) 2 L BC d ± 370.265 * 10 6 lb 2 -in. 144 * 10 6 lb ± 2.57 in.-lb ; + ( ² 1558.8 lb) 2 (60 in.) d ± 1 2 EA c (1800 lb) 2 (69.282 in.) NOTE: The strain energy U 3 is not equal to U 1 ³ U 2 . ± 2.22 in.- lb ; ± 319.548 * 10 6 lb 2 -in. 144 * 10 6 lb + ( ² 1258.8 lb) 2 (60 in.) d ± 1 2 EA c (1800 lb) 2 (69.282 in.) Problem 2.7-8 The statically indeterminate structure shown in the figure consists of a horizontal rigid bar AB supported by five equally spaced springs. Springs 1, 2, and 3 have stiffnesses 3 k , 1.5 k , and k , respectively. When unstressed, the lower ends of all five springs lie along a horizontal line. Bar AB , which has weight
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