Curved Bridge Design, Fabrication and Construction · Curved Girder Specifications Curved Steel Girder Bridges • 1980’s era Japanese Specifications • 1980 AASHTO Guide Specifications

Curved Bridge

Design, Fabrication

and Construction

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OVERVIEW

of

CURVED STEEL

GIRDER BRIDGES

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Advantages of Curved Steel Girders

1. Longer Spans

2. Continuous Girders

3. Accommodate Complex Geometry

4. Minimize Expansion Jts. & Bearing Devices

5. Simplified Deck Construction

6. More Aesthetic Structure

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How Complicated are

Horizontally Curved

Girders?

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Consider thisContractorsSituation !

ConsiderConsider thisthisContractorsContractorsSituationSituation !!

Curved Steel Girder Bridges

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Construction Sequence Can Be Critical to Successful

Erection

Construction Construction Sequence Can Sequence Can Be Critical to Be Critical to Successful Successful

ErectionErection

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History

&

Background

Cur

ved

Ste

el G

irder

Brid

ges


Key Historical United States Research Effort

Key Historical United States Key Historical United States Research EffortResearch Effort


•CURT PROJECT – Consortium of University Research Teams:� Carnegie Mellon University� University of Rhode Island� Syracuse University� University Pennsylvania

•Pennsylvania Department of Transportation / CMU •Lehigh University•FHWA Curved Steel Bridge Research Project

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Curved Girder SpecificationsCurved Girder Curved Girder SpecificationsSpecifications


• 1980’s era Japanese Specifications • 1980 AASHTO Guide Specifications - ‘Small Format’• 1993 AASHTO Guide Specifications - ‘Large Format’• 1999 NCHRP Report 424• 2003 AASHTO Improved Guide Specifications• AASHTO LRFD with 2005 Interim Specifications• AASHTO LRFD 4th Edition

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Part I –

Early Research

Part I Part I ––

Early ResearchEarly Research


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Part II -

Research

Part II Part II --

ResearchResearch


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FH

WA

Poo

led

Fun

ds -

Cur

ved

Ste

el B

ridge

R

esea

rch

Pro

ject


RESEARCH TEAM

• Federal Highway Administration – TFHRC

• HDR Engineering

• Georgia Tech

• Auburn University

• BSDI, Ltd

• Research Council on Curved Steel Bridges

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RESEARCH OBJECTIVES

• Conduct Fundamental analytical and physical research on the behavior of curved steel I-girder bridges.

• Address constructability issues

• Provide data for eventual development of Load and Resistance Factor Design (LRFD) provisions for curved steel bridges

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• Task A – Interim Report I, “Synthesis”

• Task B – Research Council on Curved Bridges (RCCB)

• Task C – Construction Issues

• Task D – Nominal Bending and Sheer Strength of Curved I – and Box – Sections

• Task E – Diaphragms, Cross Frames, and Lateral Bracing and Lateral Effects

• Task F – Serviceability Considerations and Impact

• Task G – Level of Analysis

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Three – Girder Test Frame

• 90 ft. simple span and 200-ft radius along longitudinal centerline

• Transverse girder spacing of 8.75 ft

• 48 – inch web depth

• 50 ksi and 70 ksi yield strengths

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COMPONENT SPECIMENS

Key Variables:

• Span Length

• Radius

• Unbraced length

• Flange width

• Web slenderness

• Web stiffening

• Symmetrical vs. unsymmetrical

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– Research –

Bill Wright Presentation

–– Research Research ––

Bill Wright Bill Wright PresentationPresentation


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Load

344

kip

s

Load

354

kip

s

Load

377

kip

s









EXPECTED RESULTS• Advance state-of-art knowledge on

fundamental behavior of curved I girders in bending and shear and stimulate future studies

• Correlate test results with results from refined computer analyses

• Increase general awareness of important construction issues

• Realize significant cost savings as a result of improved design and construction procedures

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AA

� Guide Specifications for Horizontally

Curved Highway Bridges 1980 – small size

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Documents

Curved Bridge Design, Fabrication and Construction · Curved Girder Specifications Curved Steel Girder Bridges • 1980’s era Japanese Specifications • 1980 AASHTO Guide Specifications