Mechanics of Materials, 7th Edition

Published by McGraw-Hill Education
ISBN 10: 0073398233
ISBN 13: 978-0-07339-823-5

Chapter 1 - Problems - Page 42: 1.49


$$a=1.75 \space in$$ $$b=7.50 \space in$$

Work Step by Step

1) Allowable Stresses $\sigma_{all} = \frac{\sigma_{U}}{F.S.} = 10\space ksi$ $\tau_{all} = \frac{\tau_{U}}{F.S.} = 83.33\space psi$ 2) Plate width (a) Since plate is under tensile stress the effective cross sectional area is reduced by the width of the opening. $A_{sxn} = 0.25 * (a - 0.75)$ $\sigma_{all} = \frac{P}{A_{sxn}} = \frac{2.5\space kip}{ 0.25 * (a - 0.75)\space in^2} = 10\space ksi$ Solving for the unknown value, a: $a=\frac{2.5}{10}*4 +3/4 = \boxed{1.75\space in}$ $\leftarrow\space\space ANS 1$ 3)Plate bonding depth (b) For calculating shear between the plate/concrete, four surfaces are taken into account - the two large flats of the plate, and the two edges. Therefore the effective area for shear distribution is: $A_{shear} = 2(0.25*b) + 2(a*b) = 2(0.25b) + 2(1.75b) = 4b$ $\tau_{all} = \frac{P}{A_{shear}} = \frac{2500\space lb}{4b\space in^2} = 83.33\space psi$ Solving for the unknown value b: $b = \frac{2500}{4*83.33} = \boxed{7.50\space in}$ $\leftarrow\space\space\space ANS2$
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