tailieunhanh - Engineering Mechanics Statics - Examples Part 10

Tham khảo tài liệu 'engineering mechanics statics - examples part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Engineering Mechanics - Statics Chapter 7 Problem 7-12 The boom DF of the jib crane and the column DE have a uniform weight density Y. If the hoist and load have weight W determine the normal force shear force and moment in the crane at sections passing through points A B and C. Treat the boom tip beyond the hoist as weightless. Given W 300 lb lb Y 50 ft ft a 7 b 5 ft c 2 ft d 8 ft e 3 ft Solution A VFX 0 f ZFy 0 0 A ZFX 0 -Na 0 Na 01b Va - W - Ye 0 Va W Y e I e ma - Y el 2 MA Y -Nb 0 - We 0 I 2 Ì ị l2 J We NA Va 4501b MA Nb 01b T Fy 0 Vb - Y d e - W 0 Vb Y d e W Nb Vb 8501b d e M 0 Mb - y d e - W d e 0 Mb Y d e 2 W d e MB 632 2007 R. C. Hibbeler. Published by 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. Engineering Mechanics - Statics Chapter 7 A VFx 0 f ZFy 0 1 Mc 0 Vc 0 Vc 0lb Nc - c d e Y - W - y b 0 Nc Y c d e b W Vc lb I c d e Mc - c d e Y I--------2-----I - W c d e 0 Ị c d e 1 Mc c d e Y I-------2----I W c d e Nc Mc Problem 7-13 Determine the internal normal force shear force and moment at point c. Units Used kip 103 lb Given a ft d 8ft b 2 ft e -- 4 ft 3 ft lb c w 150 ft Solution Entire beam FMA 0 -w d e I 2 T a b 0 2 w d e . T _ J T kip 2 a b SFx 0 Ax - T 0 Ax T Ax kip XFy 0 Ay - w d e 0 Ay w d e Ay kip Segment Ac 633 2007 R. C. Hibbeler. Published by 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 .