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PROPRIETARY MATERIAL. © 2010 The McGraw-Hill Companies, Inc. All rights reserved. No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation. If you are a student using this Manual, you are using it without permission. 737 PROBLEM 6.1 Using the method of joints, determine the force in each member of the truss shown. State whether each member is in tension or compression. SOLUTION 2 2 2 2 3 1.25 3.25 m 3 4 5m AB BC = + = = + = Reactions : 0: (84 kN)(3 m) (5.25 m) 0 A M C Σ = - = 48 kN = C 0: 0 x x F A C Σ = - = 48 kN x = A 0: 84 kN 0 y y F A Σ = = = 84 kN y = A Joint A : 12 0: 48 kN 0 13 x AB F F Σ = - = 52 kN AB F =+ 52 kN AB F T = 5 0: 84 kN (52 kN) 0 13 y AC F F Σ = - - = 64.0 kN AC F =+ 64.0 kN AC F T = Joint C : 48 kN 5 3 BC F = 80.0 kN BC F C =
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