204CHAPTER 2Axially Loaded Members(c) LOADSP1ANDP2ACT SIMULTANEOUSLYU3±12EAc(FAB)2LAB+(FBC)2LBCd±370.265*106lb2-in.144*106lb±2.57 in.-lb;+(²1558.8 lb)2(60 in.)d±12EAc(1800 lb)2(69.282 in.) NOTE:The strain energy U3is notequal to U1³U2.±2.22 in.- lb;±319.548*106lb2-in.144*106lb+(²1258.8 lb)2(60 in.)d±12EAc(1800 lb)2(69.282 in.) Problem 2.7-8The statically indeterminate structure shown in the figure consists of a horizontal rigid bar ABsupported by five equally spaced springs. Springs 1, 2, and 3 have stiffnesses 3k, 1.5k, 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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