Bridge Bearings - Caltrans

I MEMO TO DESIGNERS 7-1 JUNE 1994 ----:..:..c=~~~ 11z/trans 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 19 55) has been the most widely used the past four decades. As design trends have shifted toward designs that favor s tructures with longer frames and fewer joints for seismic reasons, not to mention the widespread use ofcurved and skewed bridges, the demands on Bearings have increased.

The prestress shortening percentage (50 percent) used to design the bearing pad may be reduced at hinges that have delayed hinge closure pours when the sliding bearing

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