Transcription of Bridge Bearings
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Bridge Bearings
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. Provisions must be made for large longitudinal displacements due to temperature, prestress shortening, shrink- age, creep and seismic activities, as well as rotations produced by changes in camber, live load, and misalignment of bearing seats due to construction tolerances.
Bridge Design Specification. Pad thickness is determined in increments of . x/i. inch. Minimum laminated pad thickness is one inch. Maximum laminated pad thickness is . 6. inches at abutments and 4 inches at hinges. Plan dimensions (length, width) are determined in two inch increments. Maximum dimensions should not exceed 30 inches.
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