Accelerated load testing of seismic expansion joints for the new san francisco oakland bay bridge
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HVSIA Annual Meeting, San Jose, Costa Rica August 21-23, 2013 PowerPoint PPT Presentation


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Accelerated Load Testing of Seismic Expansion Joints for the New San Francisco – Oakland Bay Bridge. David Jones, John Harvey and Rongzong Wu. HVSIA Annual Meeting, San Jose, Costa Rica August 21-23, 2013. Bridge Schematic. Introduction Study objective and workplan

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HVSIA Annual Meeting, San Jose, Costa Rica August 21-23, 2013

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Accelerated Load Testing of Seismic Expansion Joints for the New San Francisco – Oakland Bay Bridge

David Jones, John Harvey and Rongzong Wu

HVSIA Annual Meeting, San Jose, Costa Rica

August 21-23, 2013


Bridge Schematic


Introduction

Study objective and workplan

Test section construction

Instrumentation

Results

Conclusions and implementation

Summary


Introduction

  • Background

    • Existing bridge built in 1936

    • Damaged in 1989 earthquake

    • Retrofit too expensive

    • New bridge designed

  • Bridge design

    • Three different structures

    • New joint design to link structures

      • Design for seismic activity

      • Individual lane maintenance


Bay Bridge Design


Bay Bridge Design


Introduction

Study objective and workplan

Test section construction

Instrumentation

Results

Conclusions and implementation

Summary


Study Objective and Workplan

  • Objectives

    • Identify any fatal flaws related to vehicle trafficking

    • Determine how the joint will fail under vehicle trafficking

    • Seismic testing NOT part of workplan

  • Workplan

    • Construction of test structure

    • Phased approach to testing (7 phases)


Workplan


Workplan


Introduction

Study objective and workplan

Test section construction

Instrumentation

Results

Conclusions and implementation

Summary


Test Section Construction

  • Concrete structure to same dimensions

  • Prototype deck joint


Test Section Construction


Test Section Construction


Test Section Construction


Test Section Construction


Introduction

Study objective and workplan

Test section construction

Instrumentation

Results

Conclusions and implementation

Summary


Instrumentation

  • Comprehensively instrumented

    • Temperatures

    • Vertical deflection

    • Longitudinal strain

    • Bolt rotation

    • Profile


Instrumentation


Introduction

Study objective and workplan

Test section construction

Instrumentation

Results

Conclusions and implementation

Summary


Results

  • Phase 1.1: Fatal flaw assessment

    • No apparent damage

    • Vertical settlement was 0.2 mm

    • No permanent deformation

    • Deflection of 0.9 mm on deck

    • Vertical deflection of 0.1 mm on bolts

    • Longitudinal strain of 60 µ-strain on deck


Results: Phase 1


Results: Phase 1


Results

  • Phase 1.2: Load response

    • Linear relationship

    • Maximum deflection of 2.3 mm

    • Maximum strain of 135 µ-strain


Results: Phase 1.2


Results

  • Phase 1.2: Load response

    • Linear relationship

    • Maximum deflection of 2.3 mm

    • Maximum strain of 135 µ-strain

  • Phase 1.3: Effect of wander

    • No effect


Results

  • Phase 2.1: Testing on edge of steel plate

    • No difference in trends compared to center

    • Higher deflections and strains

    • Some damage to Trelleborg unit


Results

  • Phase 3.1: Impact loading on edge

    • No effect at 60kN

  • Phase 3.2: Impact loading on edge

    • No significant effect at 80kN and 100kN


Results: Phase 3.2


Results

  • Phase 3.1: Impact loading on edge

    • No effect at 60kN

  • Phase 3.2: Impact loading on edge

    • No significant effect by impact load

  • Phase 3.3: Heavy loading

    • No structural damage

    • Some damage to Trelleborg unit


Results: Phase 3.3


Results: Phase 3.3


Introduction

Study objective and workplan

Test section construction

Instrumentation

Results

Conclusions and implementation

Summary


Conclusions and Implementation

  • Summary

    • No fatal flaws in design

    • No structural damage

    • Some wear to Trelleborg

  • Implementation

    • Considered appropriate for use

  • Other findings

    • Role of APT in testing bridge components


Thank-you

djjones@ucdavis.edu

www.ucprc.ucdavis.edu


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