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01 Solutions 46060 5/6/10 2:43 PM Page 3 © 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. •1–5. Determine the resultant internal loadings in the beam at cross sections through points D and E. Point E is just to the right of the 3-kip load. 1.5 kip/ ft 3 kip A D B E C 6 ft 6 ft 4 ft 4 ft Support Reactions: For member AB a+ ©M B = 0; 9.00(4) - A y (12) = 0 A y = 3.00 kip : + ©F x = 0; B x = 0 + c ©F y = 0; B y + 3.00 - 9.00 = 0 B y = 6.00 kip Equations of Equilibrium: For point D : + ©F x = 0; N D = 0 Ans. + c ©F y = 0; 3.00 - 2.25 - V D = 0 V D = 0.750 kip Ans. a +©M D = 0; M D + 2.25(2) - 3.00(6) = 0 M D = 13.5 kip # ft Ans. Equations of Equilibrium: For point E : + ©F x = 0; N E = 0 Ans. + c ©F y = 0; -6.00 - 3 - V E = 0 V E = -9.00 kip Ans. a +©M E = 0; M E + 6.00(4) = 0 M E = -24.0 kip # ft Ans. Negative signs indicate that M E and V E act in the opposite direction to that shown on FBD. 3

01 Solutions 46060 5/6/10 2:43 PM Page 4 © 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. 1–6. Determine the normal force, shear force, and moment at a section through point C. Take P = 8 kN. B Support Reactions: a+©M A = 0; 8(2.25) - T(0.6) = 0 T = 30.0 kN : + ©F x = 0; 30.0 - A x = 0 A x = 30.0 kN + c ©F y = 0; A y - 8 = 0 A y = 8.00 kN P 0.1 m 0.75 m 0.5 m C 0.75 m 0.75 m A Equations of Equilibrium: For point C : + ©F x = 0; -N C - 30.0 = 0 N C = -30.0 kN Ans. + c ©F y = 0; V C + 8.00 = 0 V C = -8.00 kN Ans. a +©M C = 0; 8.00(0.75) - M C = 0 M C = 6.00 kN # m Ans. Negative signs indicate that N C and V C act in the opposite direction to that shown on FBD. 1–7. The cable will fail when subjected to a tension of 2 kN. Determine the largest vertical load P the frame will support and calculate the internal normal force, shear force, and moment at the cross section through point C for this loading. Support Reactions: a +©M A = 0; P(2.25) - 2(0.6) = 0 P = 0.5333 kN = 0.533 kN P 0.1 m 0.75 m Ans. 0.5 m C 0.75 m 0.75 m B A : + ©F x = 0; 2 - A x = 0 A x = 2.00 kN + c ©F y = 0; A y - 0.5333 = 0 A y = 0.5333 kN Equations of Equilibrium: For point C : + ©F x = 0; -N C - 2.00 = 0 N C = -2.00 kN Ans. + c ©F y = 0; V C + 0.5333 = 0 V C = -0.533 kN Ans. a +©M C = 0; 0.5333(0.75) - M C = 0 M C = 0.400 kN # m Ans. Negative signs indicate that N C and V C act in the opposite direction to that shown on FBD. 4

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