________________________________________________________________________ PROBLEM (7.61) Re-solve Prob.7.60 for a built-up beam of the cross section shown in Fig. P7.61. SOLUTION y 10 mm (a) 208.5 mm C z 407 mm 7.7 mm 240 mm 10 mm From solution of Prob. 7.29: I = 424.7 × 10 −6 m 4 We have, at welds: Q = 240 × 10( 208.5) = 500.4 × 10 3 mm 3 VQ V (500.4 × 10−6 ) = = 2(200 × 103 ) −6 I 424.7 × 10 Solving V = 339.5 kN q= (b) τ max VQ 2(200 ×103 ) = = = 51.9 MPa Ib 7.7(10−3 ) Excerpts from this work may be reproduced by instructors for distribution on a not-for-profit basis for testing or instructional purposes only to students enrolled in courses for which the textbook has been adopted. Any other reproduction or translation of this work beyond that permitted by Sections 107 or 108 of the 1976 United States Copyright Act without the permission of the copyright owner is unlawful.