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Guidance on the development of test specifications for these isolators is also given. Design guidance is given for the lead-rubber isolator, the friction-pendulum isolator, and the Eradiquake isolator, all of which are found in use today in the United States.
#SAP 2000 FA > FE MANUAL#
This manual presents the principles of isolation for bridges, develops step-by step methods of analysis, explains material and design issues for elastomeric and sliding isolators, and gives detailed examples of their application to standard highway bridges. More than 200 bridges have been designed or retrofitted in the United States using seismic isolation in the last 20 years, and more than a thousand bridges around the world now use this cost- effective technique for seismic protection. This greatly reduces the seismic forces and displacements transmitted from the superstructure to the substructures. Thus, when an isolated bridge is subjected to an earthquake, the deformation occurs in the isolators rather than the substructure elements. These devices are called seismic isolation bearings or simply isolators. Uncoupling is achieved by interposing mechanical devices with very low horizontal stiffness between the superstructure and substructure. Improved performance is therefore possible for little or no extra cost, and older, seismically deficient bridges may not need strengthening if treated in this manner. Isolation physically uncouples a bridge superstructure from the horizontal components of earthquake ground motion, leading to a substantial reduction in the forces generated by an earthquake. HRDI-7 Senior Research Structural Engineer/Seismic Research Program Manager Federal Highway Administrationĭepartment of Civil and Environmental Engineering, University of Nevada Reno Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York 3 Department of Engineering Sciences, Middle East Technical University 4 Turner Fairbanks Highway Research Center, Federal Highway Administration MCEER University at Buffalo, The State University of New York Red Jacket Quadrangle, Buffalo, NY 14261 Phone: (716) 645-3391 Fax (716) 645-3399 E-mail: WWW Site: ĮXECUTIVE SUMMARY Seismic isolation is a response modification technique that reduces the effects of earthquakes on bridges and other structures. Task Number 094-D-3.1 FHWA Contract Number DTFH61-98-C-00094 Contract Officer’s Technical Representative: W. Publication Date: AugSpecial Report MCEER-06-SP07 Constantinou,2 Mirat Dicleli3 and Hamid Ghasemi4
#SAP 2000 FA > FE PDF#
Seismic Isolation Of Highway Bridges Pdf Onlineīy Ian G. SEISMIC ISOLATION OF HIGHWAY BRIDGES Kazuhiko KAWASHIMA1 1 Member of JAEE, Professor, Department of Civil Engineering, Tokyo Institute of Technology, Tokyo, Japan, ABSTRACT: This paper introduces the seismic isolation technology for highway bridges in Japan. Single- and two-span highway bridges subjected to representative strong earthquake ground motion records were analyzed. The system of base isolation is considered as a bilinear spring. A study is made on the seismic behaviour of highway bridges with lead–rubber base isolation. Intended to supplement AASHTO’s Guide Specifications for Seismic Isolation Design (1999), this manual presents the principles of isolation for bridges, develops step-by-step methods of analysis, explains material and design issues for elastomeric and sliding isolators, and gives detailed examples of their application to standard highway bridges.
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A study was made on the seismic behavior of highway bridges with lead-rubber base isolation. Laurence Jacobs School of Civil and Environmental Engineering Georgia Institute of Technology Dr. Reginald DesRoches, Advisor School of Civil and Environmental Engineering Georgia Institute of Technology Dr.