LRFD-Based Analysis and Design Procedures for Bridge Bearings and Seismic Isolators

436 Pages·2011·9.86 MB·English

ISSN 1520-295X
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Technical Report MCEER-11-0004
September 26, 2011
University at Buffalo The State University of New York
ISSN 1520-295X
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0 This research was conducted the University at Buffalo, State University of New York, and was supported by the Federal Highway
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4 Administration under Contract Number DTFH61-07-C-00020 and the California Department of Transportation under Contract Number
65A0215 through a project with the Pacific Earthquake Engineering Research Center Number 1514289, Subagreement 00006414.
NOTICE
This report was prepared by the University at Buffalo, State University of New
York as a result of research sponsored by the Federal Highway Administration
and the California Department of Transportation through a project with the
Pacific Earthquake Engineering Research Center (PEER). Neither MCEER, as-
sociates of MCEER, its sponsors, the University at Buffalo, State University of
New York, nor any person acting on their behalf:
a. makes any warranty, express or implied, with respect to the use of any
information, apparatus, method, or process disclosed in this report or that
such use may not infringe upon privately owned rights; or
b. assumes any liabilities of whatsoever kind with respect to the use of, or the
damage resulting from the use of, any information, apparatus, method, or
process disclosed in this report.
Any opinions, findings, and conclusions or recommendations expressed in this
publication are those of the author(s) and do not necessarily reflect the views
of MCEER or its sponsors.
LRFD-Based Analysis and Design Procedures for

Bridge Bearings and Seismic Isolators
by
M. C. Constantinou1 , I. Kalpakidis2, A. Filiatrault1 and R.A. Ecker Lay3
Publication Date: September 26, 2011
Submittal Date: August 15, 2011
Technical Report MCEER-11-0004
PEER Project Number 1514289, Subagreement 00006414
Caltrans Contract Number 65A0215
FHWA Contract Number DTFH61-07-C-00020
1 Professor, Department of Civil, Structural and Environmental Engineering, Univer-
sity at Buffalo, State University of New York
2 Post-Doctoral Researcher, Department of Civil, Structural and Environmental Engi-
neering, University at Buffalo, State University of New York
3 Graduate Student, Department of Civil, Structural and Environmental Engineering,
University at Buffalo, State University of New York
MCEER
University at Buffalo, State University of New York
Red Jacket Quadrangle, Buffalo, NY 14261
Phone: [phone]; Fax [phone]
E-mail: [email protected]; WWW Site: http://mceer.buffalo.edu

Preface
MCEER is a national center of excellence dedicated to the discovery and development
of new knowledge, tools and technologies that equip communities to become more
disaster resilient in the face of earthquakes and other extreme events. MCEER accom-
plishes this through a system of multidisciplinary, multi-hazard research, in tandem
with complimentary education and outreach initiatives.
Headquartered at the University at Buffalo, The State University of New York, MCEER
was originally established by the National Science Foundation in 1986, as the fi rst Na-
tional Center for Earthquake Engineering Research (NCEER). In 1998, it became known
as the Multidisciplinary Center for Earthquake Engineering Research (MCEER), from
which the current name, MCEER, evolved.
Comprising a consortium of researchers and industry partners from numerous disci-
plines and institutions throughout the United States, MCEER’s mission has expanded
from its original focus on earthquake engineering to one which addresses the technical
and socio-economic impacts of a variety of hazards, both natural and man-made, on
critical infrastructure, facilities, and society.
The Center derives support from several Federal agencies, including the National Sci-
ence Foundation, Federal Highway Administration, National Institute of Standards
and Technology, Department of Homeland Security/Federal Emergency Management
Agency, and the State of New York, other state governments, academic institutions,
foreign governments and private industry.
The Pacifi c Earthquake Engineering Research Center (PEER), through a contract with the
California Department of Transportation (Caltrans), is supporting a study entitled “De-
velopment of LRFD-based Unifi ed Analysis and Design Guidelines for Bridge Bearings
and Seismic Isolators for use in Service and Seismic Applications.” This study extends
earlier work performed by MCEER (supported by Caltrans and the Federal Highway
Administration), and the University of California, Berkeley (supported by Caltrans).
The results are presented in “Performance of Seismic Isolation Hardware under Ser-
vice and Seismic Loading,” MCEER-07-0012, and “Experimental Investigation on the
Seismic Response of Bridge Bearings,” UCB/EERC-2008/02. The fi rst report presents a
preliminary framework of LRFD-based, multi-level seismic loading procedures for the
analysis and design of isolators, and the second report presents the test data needed to
understand the deformation and strength limits of selected bridge bearings. The intent
of the current study is to extend, calibrate, test and fi nalize this preliminary framework
for bridge bearings and isolators.
This report presents analysis and design procedures for bridge bearings and seismic isolators. The
procedures are based on: (1) the LRFD framework, and (2) fundamental principles that include
the latest developments and understanding of the behavior of these devices. The new procedures
are applicable to both seismically-isolated and conventional bridges. Examples of design of con-
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ventional elastomeric and PTFE spherical bearings are presented, as well as examples of detailed
design and analysis of the seismic isolation system of a bridge located in California utilizing
lead-rubber, single Friction Pendulum and triple Friction Pendulum isolators. This report is
intended to serve as a resource document for the development of Memoranda to Designers by
the California Department of Transportation for the analysis and design of bridge bearings and
isolators.
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ABSTRACT

This report describes the development and application of analysis and design
specifications for bridge bearings and seismic isolators that (a) are based on the LRFD
framework, (b) are based on similar fundamental principles, which include the latest
developments and understanding of behavior, and (c) are applicable through the same
procedures regardless of whether the application is for seismic-isolated or conventional
bridges.

Examples are presented of design of conventional elastomeric and PTFE spherical
bearings and three examples of detailed design and analysis of the seismic isolation
system of a bridge located in California utilizing lead-rubber, single Friction Pendulum
and triple Friction Pendulum isolators. The seismic isolation design examples utilize the
latest definition of seismic hazard in California and intent to serve as a guide to
application of the technology to bridges in California.

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ACKNOWLEDGEMENTS

The work presented in this report has been supported by the Pacific Earthquake
Engineering Research Center (PEER) through a contract with the California Department
of Transportation. Additional support has been provided by MCEER, University at
Buffalo, State University of New York through a contract with the Federal Highway
Administration, Project 020, Title V. This support is gratefully acknowledged.

The progress of the work presented in this report has been reviewed over the last year by
Professor Steve Mahin and Professor James Kelly of the University of California,
Berkeley and Dr. Naeim Farzad, SE, JD of J. A. Martin and Associates on behalf of
PEER, and Dr. Tim Delis, PE, Dr. Allaoua Kartoum and Mr. Tom Shantz, PE on behalf
of the California Department of Transportation.

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