Bridge Bearings - Caltrans

M e mo t o D e s ig n e r s 7-1 * J u n e 1994. Bridge Bearings Introduction AASHTO defines a bearing as a structural device that transmits loads while facilitating translation and/or rotation . 1 In the past Caltrans has used a variety of Bearings with varying degrees of success. These include rockers, rollers, pins, pots, steel girder hangers, PTFE/elastomeric, and elastomeric pads. Of all the Bearings mentioned, the reinforced elastomeric bearing (introduced in 1955) has been the most widely used the past four decades. As design trends have shifted toward designs that favor structures with longer frames and fewer joints for seismic reasons, not to mention the widespread use of curved and skewed bridges, the demands on Bearings have increased.

therefore, the preferred means of specifying the elastomer. Hardness has been widely used in the past because the test for it is quick and simple. However, the results obtained from it are variable and correlate only loosely with shear modulus.” 1. The shear modulus of elastomer, obtained from testing, is approximately 100 psi at

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