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
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.
Fig. P9.64

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