Rain-Wind Vibration: Different Approaches at

Different Locations

Rain-Wind Vibration: Different Approaches at

Different Locations

Michael J. Abrahams, P.E.Vijay Chandra, P.E.

Ruchu Hsu, P.E.

Michael J. Abrahams, P.E.Vijay Chandra, P.E.

Ruchu Hsu, P.E.

Parsons BrinckerhoffParsons Brinckerhoff

Workshop on Wind Induced Vibration of Cable Stayed Bridges, St. Louis, MO. April 27, 2006

Replacement of theCooper River BridgesCharleston, South Carolina

Replacement of theCooper River BridgesCharleston, South Carolina

Michael J. AbrahamsMichael J. AbrahamsMichael J. Abrahams

Cable Stay SpanCable Stay Span

Diamond Towers

Roadway – 200 Feet Above Water

1546 Foot Long Span

Tower Height – 570 Feet

Longest Span in North and South America

140 Feet Wide Section – 8 Traffic Lanes Plus Pedestrian/bicycle Lane

Diamond Towers

Roadway – 200 Feet Above Water

1546 Foot Long Span

Tower Height – 570 Feet

Longest Span in North and South America

140 Feet Wide Section – 8 Traffic Lanes Plus Pedestrian/bicycle Lane

Wind Tunnel TestingWind Tunnel Testing

M2 M2 –– Turbulent FlowTurbulent Flow

Stay Cable System FeaturesStay Cable System Features

Freyssinet Monostrand, Isotension System

Extensive System Testing Program (PTI)

Freyssinet on Design – Build Subcontract

Joint effort PB- Freyssinet - PBC

Early Stage Parametric Exitation Study

Early Integration of Damping System

Provisions for Cross-ties

Freyssinet Monostrand, Isotension System

Extensive System Testing Program (PTI)

Freyssinet on Design – Build Subcontract

Joint effort PB- Freyssinet - PBC

Early Stage Parametric Exitation Study

Early Integration of Damping System

Provisions for Cross-ties

Strand ErectionStrand Erection

Welding of Stay PipesWelding of Stay Pipes

Lifting of Stay PipeLifting of Stay Pipe

Initial Length and TensionInitial Length and Tension

Upper Anchorage Inside TowerUpper Anchorage Inside Tower

Vibration Suppression DevicesVibration Suppression Devices

External Hydraulic DampersExternal Hydraulic Dampers

Internal Hydraulic DampersInternal Hydraulic Dampers

Lateral Lateral SupportsSupports

Concrete Concrete Blocks for Blocks for StiffnessStiffness

Cooper River BridgesCooper River Bridges

Vijay Chandra P.E.Vijay Chandra P.E.Senior VP / Service Center managerSenior VP / Service Center manager

Parsons BrinckerhoffParsons Brinckerhoff

Leonard P. Zakim Bunker Hill BridgeCentral Artery /Tunnel Project

Boston, Massachusetts

Leonard P. Leonard P. ZakimZakim Bunker Hill BridgeBunker Hill BridgeCentral Artery /Tunnel ProjectCentral Artery /Tunnel Project

Boston, MassachusettsBoston, Massachusetts

Bridge ElevationBridge Elevation

Bridge PlanBridge Plan

Main Span SuperstructureMain Span Superstructure

Back Span SuperstructureBack Span Superstructure

Stay CableStay Cable

Old Concept Old Concept New ConceptNew Concept

Internal DamperInternal Damper

Wind TieWind Tie

Required Damping (with Cross-ties)South Tower Main StaysRequired Damping (with Cross-ties)South Tower Main Stays

Required Damping (with Cross-ties)North Tower Main StaysRequired Damping (with Cross-ties)North Tower Main Stays

ViscoVisco--Elastic DampersElastic Dampers

Cross Tie Connection OverviewCross Tie Connection Overview

Cross Tie DetailCross Tie Detail

Cross Tie Connection DetailCross Tie Connection Detail

Section A-ASection A-A

Load TestingLoad Testing

Holiday Lighting Scheme

William H. Natcher BridgeOwensboro, KY

William H. William H. NatcherNatcher BridgeBridgeOwensboro, KYOwensboro, KY

Ruchu Hsu, P.E.Project Engineer

Parsons Brinckerhoff (PB)

Ruchu Hsu, P.E.Project Engineer

Parsons Brinckerhoff (PB)

Bridge Site

Elevation of Cable-Stayed SpansElevation of Cable-Stayed Spans

Steel Composite SuperstructureSteel Composite Superstructure

Cable ConnectionCable Connection

Tower Head and Cable ConnectionsTower Head and Cable Connections

Access Inside Tower HeadAccess Inside Tower Head

The Goal of Longevity and Minimum Maintenance Have

Been Achieved In Design.

The Goal of Longevity and The Goal of Longevity and Minimum Maintenance Have Minimum Maintenance Have

Been Achieved In Design.Been Achieved In Design.

ChaoChao PhrayaPhraya River BridgeRiver BridgeSouthern Outer Bangkok Southern Outer Bangkok

Ring Road ProjectRing Road ProjectDesigner: Designer: RuchuRuchu HsuHsu

Chao Phraya River Bridge

SOBRR

ELEVATIONELEVATION

PLAN

ELEVATION

500m Main Span941m Total Length

36.7m Width (4 Lanes Each Way)

Result of Engineer & Result of Engineer & Architect CooperationArchitect Cooperation

Tower & Anchor Pier ConstructionTower & Anchor Pier Construction

Stay Cable Stay Cable

Wind Tie Layout and DetailsWind Tie Layout and Details

Human EngineeringHuman Engineering

A User Friendly Bridge for ThailandA User Friendly Bridge for Thailand