Characterization of a Roller Seismic Isolation Bearing with Supplemental Energy Dissipation for Highway Bridges

Sloped multi‐roller isolation devices for seismic protection of equipment and facilities

“…Theoretically, if the roller and bearing plates are ideally in pure rolling motion without any undesired sliding and overturning motions, the rolling motion of a pair of rollers should be equivalent to that of a single roller. The basic assumptions are similar to those made in Lee's study [14], except that an arc rolling range d with a fixed curvature radius R is provided at the intersection of two inclines of V-shaped surfaces of bearing plates (i.e. The basic assumptions are similar to those made in Lee's study [14], except that an arc rolling range d with a fixed curvature radius R is provided at the intersection of two inclines of V-shaped surfaces of bearing plates (i.e.…”

“…Summary of theoretical derivation by Lee's study [14] Lee [14] studied the dynamic behavior of the sloped rolling-type isolation device in which a single roller moves between a flat surface and a V-shaped surface along each principle horizontal direction. Summary of theoretical derivation by Lee's study [14] Lee [14] studied the dynamic behavior of the sloped rolling-type isolation device in which a single roller moves between a flat surface and a V-shaped surface along each principle horizontal direction.…”

“…The currently available passive isolation bearings can be classified into three primary types: (1) elastomeric [4,5]; (2) sliding-based [6,7]; and (3) rolling-based [8][9][10][11][12][13][14][15][16]. Similar to successful applications of seismic isolation technologies to building and bridge structures [17][18][19][20], the implementation of seismic isolation devices, instead of conventional restraints [21], to equipment or facilities may be one of the most practical and effective strategies [22][23][24] to mitigate the seismic risk.…”

“…It was first proved that the rolling mechanism is very effective in filtering out input ground accelerations because of its limited rolling friction. the sloped rolling-type isolation device) was theoretically and experimentally investigated by Tsai [13] and Lee [14,15] for seismic protection of bridge structures. These devices have been numerically and experimentally validated for effectively reducing seismic demand on the protected superstructures.…”

“…These devices have been numerically and experimentally validated for effectively reducing seismic demand on the protected superstructures. Lee's study [14] provided a detailed theoretical derivation and design requirements for the instance in which one of two bearing plates in contact with a single roller has a flat surface along each principle horizontal direction. the sloped rolling-type isolation device) was theoretically and experimentally investigated by Tsai [13] and Lee [14,15] for seismic protection of bridge structures.…”