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MCEER/ATC-49-2

Design Examples

Recommended LRFD Guidelines for the Seismic Design of Highway Bridges

Prepared under NCHRP Project 12-49, FY `98 "Comprehensive Specification for the Seismic Design of Bridges" National Cooperative Highway Research Program

Prepared by ATC/MCEER JOINT VENTURE A partnership of the Applied Technology Council

(www.ATCouncil.org)

and the Multidisciplinary Center for Earthquake Engineering Research

(http://mceer.buffalo.edu)

NCHRP 12-49 PROJECT PARTICIPANTS Project Team Ian Friedland, Principal Investigator Ronald Mayes, Technical Director Donald Anderson Michel Bruneau Gregory Fenves John Kulicki John Mander Lee Marsh Geoffrey Martin Andrzej Nowak Richard Nutt Maurice Power Andrei Reinhorn Project Engineering Panel Ian Buckle, Co-Chair Christopher Rojahn, Co-Chair Serafim Arzoumanidis Mark Capron Ignatius Po Lam Paul Liles Brian Maroney Joseph Nicoletti Charles Roeder Frieder Seible Theodore Zoli

2003

DESIGN EXAMPLES

2003 Guidelines for the Seismic Design of Highway Bridges

PREFACE

In 2003 the ATC/MCEER Joint Venture, a partnership of the Applied Technology Council (ATC) and the Multidisciplinary Center for Earthquake Engineering Research (MCEER), University at Buffalo, published the set of documents, Recommended LRFD Guidelines for the Seismic Design of Highway Bridges, Part I, Specifications, and Part II, Commentary and Appendices (MCEER/ATC-49 Report). These documents are reformatted versions of the seismic design provisions (specifications and commentary) for highway bridges developed under NCHRP (National Cooperative Highway Research Program) Project 12-49, a recently completed project to develop seismic design provisions that would be compatible with the AASHTO LRFD Bridge Design Specifications. The reformatting effort, which was carried out to facilitate immediate use of the Project 12-49 provisions by bridge design professionals, was funded as a task under the MCEER Highway Project, which is sponsored by the Federal Highway Administration (FHWA). NCHRP Project 12-49 also included a companion study to investigate the effects of liquefaction and an effort to develop design examples using the NCHRP 12-49 recommended provisions. The design examples are provided in this MCEER/ATC49-2 Report, Design Examples, Recommended LRFD Guidelines for the Seismic Design of Highway Bridges, and the liquefaction study is documented in the companion MCEER/ATC-49-1 Report, Liquefaction Study Report, Recommended LRFD Guidelines for the Seismic Design of Highway Bridges. The two design examples contained in this document, which illustrate use of the Recommended LRFD Guidelines for the Seismic Design of Highway Bridges, are the eighth and ninth design examples in a series originally developed for FHWA to illustrate the use of the American Association of State Highway and Transportation Officials (AASHTO) Division 1-A Standard Specifications for Highway Bridges. Each of the nine design examples, including the seven previously developed, were carried out and reported on in a consistent manner, using the same calculation and report formatting procedures. Design Example 8 was performed on a five-span continuous cast-in-place concrete box girder bridge and the ninth design example (Design Example 2LRFD) was performed on a three-span continuous steel girder bridge. A broad array of engineering expertise was engaged by the ATC/MCEER Joint Venture to develop the original NCHRP 12-49 seismic design provisions, companion liquefaction study, and design examples. Ian Friedland of ATC (and formerly MCEER) served as the Project Principal Investigator and Ronald Mayes (Simpson Gumpertz & Heger, Inc.) served as the Project Technical Director. The NCHRP Project 12-49 team consisted of Donald Anderson (CH2M Hill, Inc.), Michel Bruneau (University at Buffalo), Gregory Fenves (University of California at Berkeley), John Kulicki (Modjeski and Masters, Inc.), John Mander (University of Canterbury, formerly University at Buffalo), Lee Marsh (BERGER/ABAM Engineers), Ronald Mayes (Simpson, Gumpertz & Heger, Inc.), Geoffrey Martin (University of Southern California), Andrzej Nowak (University of Michigan), Richard Nutt (bridge consultant), Maurice Power (Geomatrix Consultants, Inc.), and Andrei Reinhorn (University at Buffalo). The project also included an advisory Project Engineering Panel; Ian Buckle, of the University of Nevada at Reno, co-chaired this committee with Christopher Rojahn of ATC, who also served as the Project Administrative Officer. Other members included Serafim Arzoumanidis (Steinman Engineers), Mark Capron (Sverdrup Civil Inc.), Ignatius Po Lam (Earth Mechanics), Paul Liles (Georgia DOT), Brian Maroney (California DOT), Joseph Nicoletti (URS Greiner Woodward Clyde), Charles Roeder (University of Washington), Frieder Seible (University of California at San Diego), and Theodore Zoli (HNTB Corporation). NCHRP Project Panel C12-49, under the direction of NCHRP Senior Program Officer David Beal and chaired by Harry Capers of the New Jersey Department of Transportation (DOT), also provided a significant amount of input and guidance during the conduct of the project. The other members of the NCHRP Project Panel were D.W. Dearasaugh (Transportation Research Board), Gongkang Fu (Wayne State University), C. Stewart Gloyd (Parsons Brinckerhoff), Manoucher Karshenas (Illinois DOT), Richard Land (California DOT), Bryan Millar (Montana DOT), Amir Mirmirman (University of

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PREFACE

DESIGN EXAMPLES Central Florida), Charles Ruth (Washington State DOT), Steven Starkey (Oregon DOT), and Phillip Yen (FHWA). Three drafts of the Project 12-49 specifications and commentary were prepared and reviewed by the ATC Project Engineering Panel, NCHRP Project Panel 12-49, and the AASHTO Highway Subcommittee on Bridges and Structures seismic design

2003 Guidelines for the Seismic Design of Highway Bridges technical committee (T-3), which was chaired by James Roberts of Caltrans. Lee Marsh led the development of the design examples provided in this volume and ATC and MCEER staff provided publishing services. Michel Bruneau, MCEER Christopher Rojahn, ATC

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PREFACE

DESIGN EXAMPLES

2003 Guidelines for the Seismic Design of Highway Bridges

TABLE OF CONTENTS

PREFACE ............................................................................................................................................................... iii LIST OF FIGURES............................................................................................................................................... vii LIST OF TABLES...................................................................................................................................................ix DESIGN EXAMPLE 8 I INTRODUCTION ............................................................................................................................ 1-1 II FLOWCHARTS ............................................................................................................................... 2-1 III ANALYSIS AND DESIGN ............................................................................................................. 3-1 BRIDGE WITH TWO-COLUMN BENTS Design Step 1, Preliminary Design ............................................................................................. 3-7 Design Step 2, Basic Requirements ........................................................................................... 3-10 Design Step 3, Determine Seismic Design And Analysis Procedure......................................... 3-20 Design Step 4, Determine Elastic Seismic Forces And Displacements .................................... 3-23 Design Step 5, Determine Design Forces .................................................................................. 3-52 Design Step 6, Design Primary Earthquake Resisting Elements ............................................... 3-65 Design Step 7, Design Displacements And Checks .................................................................. 3-68 Design Step 8, Design Structural Components ......................................................................... 3-80 Design Step 9, Design Foundations.......................................................................................... 3-104 Design Step 10, Design Abutments.......................................................................................... 3-115 Design Step 11, Consideration Of Liquefaction-Induced Flow Or Lateral Spreading .............................................................................................................3116 Design Step 12, Seismic Design Complete? ............................................................................ 3-118 IV CLOSING STATEMENT ............................................................................................................... 4-1 V REFERENCES ................................................................................................................................. 5-1 APPENDIX A: GEOTECHNICAL DATA, DESIGN EXAMPLE 8 ....................................................... 6-1 APPENDIX B: SAP2000 INPUT, DESIGN EXAMPLE 8........................................................................ 7-1 APPENDIX C: PUSHOVER DATA, DESIGN EXAMPLE 8 .................................................................. 8-1 DESIGN EXAMPLE 2LRFD I INTRODUCTION ............................................................................................................................ 9-1 II FLOWCHARTS ............................................................................................................................. 10-1 III SDAP C CONVENTIONAL BEARING EXAMPLE ................................................................. 11-1 Design Step 1, Preliminary Design ............................................................................................ 11-1 Design Step 2, Basic Requirements ........................................................................................... 11-3 Design Step 3, Determine Seismic Design And Analysis Procedure ......................................... 11-5 Design Step 4, Determine Elastic Seismic Forces And Displacements .................................... 11-6 Design Step 7, Design Displacements And Checks ................................................................ 11-18 Design Step 8, Design Structural Components ........................................................................ 11-19 Design Step 9, Design Foundations.......................................................................................... 11-23 Design Step 10, Design Abutments.......................................................................................... 11-35 Design Step 11, Consider Liquefaction.................................................................................... 11-36 Design Step 12, Seismic Design Complete? ............................................................................ 11-37 IV SDAP C WITH ELASTOMERIC BEARING EXAMPLE ....................................................... 12-1 Design Step 1, Preliminary Design ............................................................................................ 12-1 Design Step 2, Basic Requirements ........................................................................................... 12-6

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TABLE OF CONTENTS

DESIGN EXAMPLES

2003 Guidelines for the Seismic Design of Highway Bridges

Design Step 3, Determine Seismic Design And Analysis Procedure ......................................... 12-8 Design Step 4, Determine Elastic Seismic Forces And Displacements .................................... 12-9 Design Step 7, Design Displacements And Checks ................................................................ 12-20 Design Step 8, Design Structural Components ........................................................................ 12-24 Design Step 9, Design Foundations.......................................................................................... 12-30 Design Step 10, Design Abutments.......................................................................................... 12-38 Design Step 11, Consider Liquefaction.................................................................................... 12-39 Design Step 12, Seismic Design Complete? ............................................................................ 12-40 V SDAP A2 CONVENTIONAL BEARING EXAMPLE ............................................................... 13-1 Design Step 1, Preliminary Design ............................................................................................ 13-1 Design Step 2, Basic Requirements ........................................................................................... 13-2 Design Step 3, Determine Seismic Design And Analysis Procedure ......................................... 13-3 Design Step 7, Design Displacements And Checks .................................................................. 13-4 Design Step 8, Design Structural Components .......................................................................... 13-5 Design Step 12, Seismic Design Complete? .............................................................................. 13-7 VI SDAP A2 WITH ELASTOMERIC BEARING EXAMPLE ..................................................... 14-1 Design Step 1, Preliminary Design ............................................................................................ 14-1 Design Step 2, Basic Requirements ........................................................................................... 14-2 Design Step 3, Determine Seismic Design And Analysis Procedure ......................................... 14-3 Design Step 7, Design Displacements And Checks .................................................................. 14-4 Design Step 8, Design Structural Components .......................................................................... 14-5 Design Step 12, Seismic Design Complete? .............................................................................. 14-8 VII CLOSING STATEMENT ............................................................................................................. 15-1 VIII REFERENCES ............................................................................................................................... 16-1 APPENDIX A: GEOTECHNICAL DATA, DESIGN EXAMPLE 2LRFD .......................................... 17-1 PROJECT PARTICIPANTS ............................................................................................................................ 18-1

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TABLE OF CONTENTS

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