An elastomeric bearing (G = 130 psi) is used to support a

Chapter 2, Problem 2.79

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An elastomeric bearing (\(G=130 psi\)) is used to support a bridge girder as shown to provide flexibility during earthquakes. The beam must not displace more than \(\frac{3}{8} \mathrm{in} .\) when a 5-kip lateral load is applied as shown. Knowing that the maximum allowable shearing stress is 60 psi, determine (a) the smallest allowable dimension b, (b) the smallest required thickness a.

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