52CHAPTER 1Tension, Compression, and ShearSolution 1.8-6Suspender tie on a suspension bridgeF5tensile force incable above tieP5tensile force incable below tiesallow5allowable tensilestress in the tieFORCE TRIANGLE(a) MINIMUM REQUIRED AREA OF TIE(b) SUBSTITUTE NUMERICAL VALUES:P5130 kNu5758sallow580 MPaAmin5435mm2Amin5Tsallow5PcotusallowT5Pcotucotu5TPPPuuTieFFFREE-BODY DIAGRAM OF HALF THE TIENote: Include a small amount of the cable in thefree-body diagramT5tensile force in the tiePFTFuPTProblem 1.8-7A square steel tube of length L5 20 ft andwidth b25 10.0 in. is hoisted by a crane (see figure). Thetube hangs from a pin of diameter dthat is held by the cables
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