Effectiveness of Seismic Isolation of Highly Skewed P/C I-Girder Bridge
Publication: Journal of Bridge Engineering
Volume 6, Issue 3
Abstract
Experimental and analytical investigations were conducted to evaluate the effectiveness of isolating the superstructure from the substructure of a highly skewed prestressed concrete slab on a girder bridge. Dynamic testing of the bridge was performed using the pullback, quick-release method. A 3D finite elemental model of the bridge was calibrated and refined to match experimentally determined natural frequencies and mode shapes. Time-history analyses, using site-specific acceleration records, were conducted for the seismically isolated bridge model and an identical nonisolated bridge model. Seismic isolation was found to appreciably reduce forces that the bridge substructure and foundation must resist. When compared to the nonisolated bridge for the design earthquake (or 50-year event), the maximum pier moments were reduced between 32% and 62%, and the maximum shears were reduced between 30% and 66%.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
American Association of State Highway and Transportation Officials (AASHTO). ( 1991). Guide specifications for seismic isolation design, Washington, D.C.
2.
American Association of State Highway and Transportation Officials (AASHTO). ( 1996). Standard specifications for highway bridges, 16th Ed., Washington, D.C.
3.
Columbia Research Laboratories. ( 1992). “Inertial products division,” Columbia Bulletin 103, Woodlyn, Pa.
4.
Robson, B. N., and Harik, I. E. (1998). “Pullback testing of seismically isolated P/C I-girder bridge,”J. Struct. Engrg., ASCE, 124(8), 930–937.
5.
Robson, B. N., Harik, I. E., and Allen, D. L. ( 1998). “Seismic isolation of a highly skewed, prestressed concrete girder bridge.” Research Report KTC-98-1, Kentucky Trans. Ctr., University of Kentucky, Lexington, Ky.
6.
Street, R., Wang, Z., Harik, I. E., and Allen, D. L. ( 1996). “Source zones, recurrence rates, and time histories for earthquakes affecting Kentucky.” Research Report KTC-96-4, Kentucky Trans. Ctr., University of Kentucky, Lexington, Ky.
7.
Structural Analysis Program (SAP)90 Beta Release User's Manual. (1995). Computers and Structures, Inc., Berkeley, Calif.
8.
Structural Analysis Program (SAP)2000 6.0 User's Manual. (1996). Computers and Structures, Inc., Berkeley, Calif.
Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 6 • Issue 3 • June 2001
Pages: 221 - 224
History
Received: Mar 15, 2000
Published online: Jun 1, 2001
Published in print: Jun 2001
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.