I-345 Feasibility Study Public Meeting December 11, 2012 I-345 - - PowerPoint PPT Presentation

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I-345 Feasibility Study Public Meeting December 11, 2012 I-345 - - PowerPoint PPT Presentation

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I-345 Feasibility Study Public Meeting December 11, 2012 I-345 Bridge Feasibility Study December 11, 2012 1 Feasibility Study Team TxDOT Dallas

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SLIDE 1

I-345 Bridge Feasibility Study

I-345 Feasibility Study Public Meeting

December 11, 2012

December 11, 2012 1

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SLIDE 2

I-345 Bridge Feasibility Study

Feasibility Study Team

TxDOT – Dallas District & Bridge Division Parsons Brinckerhoff Huitt-Zollars APM Halff Associates Civil Associates

December 11, 2012 2

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I-345 Bridge Feasibility Study

Project Limits

From Louise Avenue (South of I-30) To Ross Ave (South of Woodall Rogers/Spur 366)

December 11, 2012 3

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I-345 Bridge Feasibility Study

  • I-345 was constructed in 1974.
  • Located between I-30 and Spur 366 (Woodall

Rogers).

  • High Daily Traffic Volume
  • The Feasibility Study evaluation of alternatives

is based on the growing cost of continued maintenance and preservation of the structure.

Need for Feasibility Study

December 11, 2012 4

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I-345 Bridge Feasibility Study

The purpose of the Feasibility Study is to evaluate nine (9) alternatives intended to:

  • improve the structural condition of the bridge
  • reduce maintenance cost
  • reduce the frequency of maintenance and

preservation activities.

December 11, 2012 5

Purpose for Feasibility Study

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I-345 Bridge Feasibility Study

Notice to Proceed June 2012 Develop Conceptual Alternatives Sept-Dec 2012 Stakeholder Meeting November 2012 Public Meeting December 2012 Finalize Feasibility Report Summer 2013

December 11, 2012 6

Feasibility Study Schedule

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I-345 Bridge Feasibility Study

December 11, 2012 7

Existing Condition

High Traffic Volumes 2010 Average Daily Traffic – 170,000

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I-345 Bridge Feasibility Study

  • Unsymmetrical

Columns Layout

  • Ramps Underneath

Vertical Clearance Limitation

Ramp to Main Street

Existing Condition

December 11, 2012 8

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I-345 Bridge Feasibility Study

  • Unsymmetrical

Columns Layout

  • City Streets

Underneath – Vertical Clearance Limitations

Live Oak Street

Existing Condition

December 11, 2012 9

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I-345 Bridge Feasibility Study

COLUMN

Existing Condition

December 11, 2012 10 COLUMN

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I-345 Bridge Feasibility Study

  • Bridge Designed and Built In 1974
  • Unique Design –

A - Two Steel Girder Superstructure Framing B - Concrete Deck Not Mechanically Connected (Bolted) to Floor Beams and Girders C - Unsymmetrical Column Layout

December 11, 2012 11

Existing Condition

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I-345 Bridge Feasibility Study

  • 1. No-Build

Study Alternatives

December 11, 2012 12

  • 2. Strengthen Superstructure By Connecting the top of the

Steel Girders with the Concrete Bridge Deck

  • 3. Add Columns To Provide Symmetrical Support
  • 4. Strengthen Local Connections
  • 5. Strengthen Superstructure by Adding Girders & Bent Caps
  • 6. Rapid Bridge Replacement (Roll-out, Roll-in)
  • 7. Close Down I-345 During Fast Track Superstructure & Cap

Replacement (Similar To Pierce Elevation in Houston)

  • 8. Hybrid Alternative (Combination of Alternatives 2 Thru 7)
  • 9. Complete Facility Reconstruction
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I-345 Bridge Feasibility Study

Alternative 1: No-Build

  • Continue yearly

inspection costs

December 11, 2012 13

  • Structural issues are

mostly related to zones

  • f beam connections
  • Continue maintenance

costs.

  • Expect repair costs to

increase with bridge age

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I-345 Bridge Feasibility Study

  • Reduction in girders deflection and vibration
  • Reduction in girder primary and secondary bending stresses
  • Improve structural performance of girders

December 11, 2012 14

Alternative 2: Connecting Girders to Bridge Deck

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I-345 Bridge Feasibility Study

  • Additional symmetric columns will reduce bridge distortion

as well as secondary bending and stresses

  • Reduce stresses in the girders will improve structural

behavior of members and connections

Existing Column Configuration

December 11, 2012 15

Alternative 3: Add Columns for Symmetrical Support

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I-345 Bridge Feasibility Study

Existing column configuration Additional symmetrical columns (no roadway impact) Additional symmetrical columns (roadway impact) Add columns (“optimal” column configuration) Remove columns (“optimal” column configuration)

Legend

December 11, 2012 16

Alternative 3: Add Columns for Symmetrical Support

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I-345 Bridge Feasibility Study

Objective – Modify existing connections by adding stiffeners

  • r bolted angles to reduce stresses and improve

structural behavior.

December 11, 2012 17

Alternative 4: Strengthen Connections

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I-345 Bridge Feasibility Study

  • Add precast bent

caps at existing columns

  • Add steel girders

below deck to reduce existing girder loads

  • Reduce bending

stresses on existing floor beams and girders

  • Improve structural

performance of existing members of connections

December 11, 2012 18

Alternative 5: Strengthen Superstructure by Adding Girders and Bent Caps

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I-345 Bridge Feasibility Study

December 11, 2012 19

Alternative 6: Rapid Bridge Replacement

  • Erect temporary

towers on both sides

  • f bridge
  • Build new bridge deck
  • Disconnect and Roll-
  • ut existing bridge

deck onto temporary towers

  • Dismantle old bridge

deck

  • Roll-in new bridge

deck and connect

  • Dismantle and move

towers to next location

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SLIDE 20

I-345 Bridge Feasibility Study

  • Retrofit Existing Columns
  • Use Precast Bent Cap Where

Possible

  • Use Precast Girders Where

Possible

  • Complete Shutdown of I-345.

No Traffic Maintenance

  • Very Rapid Construction –

3 to 4 Month Duration

December 11, 2012 20

Alternative 7: Fast Track Superstructure and Bent Cap Replacement

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I-345 Bridge Feasibility Study

December 11, 2012 21

Alternative 8: Hybrid Alternative (Combination of 2-7)

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I-345 Bridge Feasibility Study

  • Require environmental

study

  • Bring the facility up to

current design standards

  • Purchase Right-of-Way
  • Determine type of facility
  • Utility related issues
  • Funding
  • Community Impacts

December 11, 2012 22

Alternative 9: Complete Facility Reconstruction

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I-345 Bridge Feasibility Study

1 Initial Capital Cost 2 Ongoing Maintenance Cost 3 Construction Duration 4 Structural Life Expectancy 5 City Street Impact 6 Local Residents Impact 7 Local Businesses Impact 8 Construction Traffic Impact 9 DART Impact 10 Aesthetic Impact 11 Current Design Standards 12 Other Applicable Criteria

December 11, 2012 23

Proposed Evaluation Criteria

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I-345 Bridge Feasibility Study

Questions and Comments?

  • TxDOT representatives are available to discuss

the feasibility study and answer your questions.

  • Before leaving tonight, please fill out a

comment form. TxDOT needs your comments to help our engineers develop projects that more closely reflect the needs and values of the communities we serve. Thank you for your time and consideration.

December 11, 2012 24