NEHRP Clearinghouse
- Title
- Principles and Performance of Roller Seismic Isolation Bearings for Highway Bridges.
- File
- PB2009110466.pdf
- Author(s)
- Lee, G. C.; Ou, Y.; Liang, Z.; Niu, T.; Song, J.
- Source
- Multidisciplinary Center for Earthquake Engineering Research, Buffalo, NY.; National Science Foundation, Washington, DC.; Federal Highway Administration, Washington, DC., December 10, 2007, 334 p.
- Identifying Number(s)
- MCEER-07-0019
- Abstract
- This report presents a new roller seismic isolation bearing for use in highway bridges. The bearing uses rolling motions of cylindrical rollers between sloping surfaces to achieve seismic isolation. The bearing is characterized by a constant spectral acceleration under horizontal ground motions and by a self-centering capability, which are two desirable properties for seismic applications. The former ensures that resonance between the bearing and horizontal earthquakes will not occur while the latter guarantees that the bridge superstructure can self-center to its original position after an earthquake. Principles of the bearing under vertical loading and earthquake excitation are analytically and experimentally investigated. Two prototype roller isolation bearings have been developed, one with and the other without a built-in friction device for supplemental energy dissipation. A design example of the bearing for use in a bridge in a region of high seismicity is presented.
- Keywords
- Performance; Figures; Bearing; Earthquake engineering; Bridges (Structures); Seismic protection; Highway bridges; Principles; Case studies; Tables (Data); Roller seismic isolation bearings; Seismic isolation; Friction energy dissipation