Validation of Numerical Modeling and Analysis of Steel Bridge Towers Subjected to Blast Loadings

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General Information
Solicitation Number: 888
Status: End Solicitation Phase
Date Posted: Jul 06, 2004
Last Updated: May 08, 2014
Solicitation Expires: Jun 30, 2005
Partners: New York State Bridge Authority, CA, FHWA, NY, TX, WA, WI
Lead Organization: Federal Highway Administration
Financial Summary
Commitment Start Year: 2004
Commitment End Year: 2007
100% SP&R Approval: Approved
Commitments Required: $1,500,000.00
Commitments Received: $945,000.00
Contact Information
Lead Study Contact(s): Sheila Duwadi
sheila.duwadi@dot.gov
FHWA Technical Liaison(s): Sheila Duwadi
sheila.duwadi@dot.gov
Phone: 202- 493-3106
Organization Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
California Department of Transportation 2004 $100,000.00 Charles Sikorsky Osama Elhamshary Osama_Elhamshary@dot.ca.gov
California Department of Transportation 2005 $100,000.00 Charles Sikorsky Osama Elhamshary Osama_Elhamshary@dot.ca.gov
California Department of Transportation 2006 $100,000.00 Charles Sikorsky Osama Elhamshary Osama_Elhamshary@dot.ca.gov
Federal Highway Administration 2004 $100,000.00 Sheila Duwadi Sheila Duwadi 202- 493-3106 sheila.duwadi@dot.gov
Federal Highway Administration 2005 $250,000.00 Sheila Duwadi Sheila Duwadi 202- 493-3106 sheila.duwadi@dot.gov
New York State Bridge Authority 2005 $50,000.00 William Moreau 845-691-7245
New York State Department of Transportation 2005 $50,000.00 George Christian Gary Frederick 518-457-4645 gary.frederick@dot.ny.gov
New York State Department of Transportation 2006 $50,000.00 George Christian Gary Frederick 518-457-4645 gary.frederick@dot.ny.gov
Texas Department of Transportation 2005 $25,000.00 Tom Rummel Frank Bailey 512- 416-4730 rtimain@txdot.gov
Texas Department of Transportation 2006 $25,000.00 Tom Rummel Frank Bailey 512- 416-4730 rtimain@txdot.gov
Washington State Department of Transportation 2005 $50,000.00 Jugesh Kapur Kim Willoughby 360-705-7978 willouk@wsdot.wa.gov
Wisconsin Department of Transportation 2005 $15,000.00 Lori Richter 608-264-8435 lori.richter@dot.wi.gov
Wisconsin Department of Transportation 2006 $15,000.00 Lori Richter 608-264-8435 lori.richter@dot.wi.gov
Wisconsin Department of Transportation 2007 $15,000.00 Lori Richter 608-264-8435 lori.richter@dot.wi.gov

Background

Most major long span bridges in the United States are vulnerable to terrorism. They are high visibility structures, with a potential for extensive media exposure and public reaction if an incident were to occur. As a result of the long spans, complicated designs, site locations, etc., these bridges have very high replacement costs, and multi-year replacement construction periods. The potential for impacting regional and national economy is also greater because of the increased time for reconstruction. Many of these bridges serve as transportation arteries critical for emergency evacuation and for carrying lifelines besides vehicular traffic. Depending on the location, there is potential for mass casualties because of the volume of traffic it can carry at any given time. Most if not all of these long span bridges cross rivers, bays or other navigational channels. Damage resulting from an attack could impede navigation in addition to disrupting vehicular or other lifeline traffic flows.

Objectives

The objectives of this study are to develop better analytical modeling and numerical analysis capabilities of steel bridge towers subjected to airblast, and to develop retrofit schemes for the towers. The numerical analysis, both with and without retrofits are to be verified through large scale experimental testing.

Scope of Work

The scope consists of analytical and controlled explosive tests on large-scale steel tower sections representative of typical towers in both their as-built and retrofitted configurations to determine performance under various blast scenarios and for verification of numerical analysis techniques. Section sizes and detailing will be carefully determined to insure realistic boundary conditions and applicability to actual towers. It is envisioned that this work will consist of, at the minimum, following tasks done in several phases:

Ø Phase I - Selection of Steel Bridge Towers and Numerical Analysis of As-Built Towers

Task 1 - Select steel bridge towers from existing population of bridges for computer modeling and numerical analysis

Task 2 - Develop drawings for the selected towers to be used in Task 3

Task 3 - Utilizing various levels of tools developed by the military from low resolution prediction code (CONWEP), to medium resolution code (BlastX), to high resolution hydrodynamic code (SHAMRC and FEFLO), and one suitable commercial program, develop models and analyze selected towers to determine behavior in response to a large explosion both in close proximity and with stand-off distances.

Ø Phase II - Experimental Testing of As-Built Towers

Task 1 - Develop experimental test plans, to include determination of representative tower sections, model designs, testbed layout, required bomb sizes, instrumentation plan, etc.

Task 2 - Conduct experimental tests of as built towers for validation of numerical analysis with towers subjected to both close in detonation and with stand-offs

Task 3 - Analyze the experimental results and refine numerical modeling and analytical procedures as necessary

Task 4 - Prepare Report I that summarizes the work from phases I and II including the numerical modeling, test results and correlation of these results to the numerical models.

Ø Phase III - Numerical Analysis and Experimental Testing of Retrofitted Towers

Task 1 - Select blast resistant retrofit schemes for the bridge towers tested in phase II,

Task 2 - Conduct computer modeling and analysis of the retrofit schemes using programs from Phase I

Task 3 - Develop experimental test plans, to include determination of representative tower sections, model designs, testbed layout, required bomb sizes, instrumentation plan, etc.

Task 4 - Conduct experimental tests of retrofitted towers subjected to close in detonation and with stand-offs for verification of the retrofit schemes and validation of numerical analysis.

Task 5 - Analyze experimental results and refine modeling and analytical procedures as necessary

Task 6 - Prepare Report II that summarizes the work under Phase II, including the test results and correlation of these results to the numerical models. The report should provide an analysis of the effectiveness of the tested retrofits and should discuss possible improved retrofit schemes.

Ø Phase IV - Final Report and Executive Summary

Task 1 - Prepare a final report synthesizing the findings of all phases

Task 2 - Prepare an executive summary

Comments

Funds are still being solicited from potential partners. The commitments received to date is $915,000 while the projected amount for fully funding the study is $1,500,000.

The requested minimum contribution is $50K per fiscal year.

Documents Attached
Title File/Link Type Privacy Download
Validation of Numerical Modeling and Analysis of Steel Bridge Towers Subjected to Blast Loadings 888.pdf Solicitation Public

Validation of Numerical Modeling and Analysis of Steel Bridge Towers Subjected to Blast Loadings

General Information
Solicitation Number: 888
Status: End Solicitation Phase
Date Posted: Jul 06, 2004
Last Updated: May 08, 2014
Solicitation Expires: Jun 30, 2005
Partners: New York State Bridge Authority, CA, FHWA, NY, TX, WA, WI
Lead Organization: Federal Highway Administration
Financial Summary
Commitment Start Year: 2004
Commitment End Year: 2007
100% SP&R Approval: Approved
Commitments Required: $1,500,000.00
Commitments Received: $945,000.00
Contact Information
Lead Study Contact(s): Sheila Duwadi
sheila.duwadi@dot.gov
FHWA Technical Liaison(s): Sheila Duwadi
sheila.duwadi@dot.gov
Phone: 202- 493-3106
Commitments by Organizations
Agency Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
California Department of Transportation 2004 $100,000.00 Charles Sikorsky Osama Elhamshary Osama_Elhamshary@dot.ca.gov
California Department of Transportation 2005 $100,000.00 Charles Sikorsky Osama Elhamshary Osama_Elhamshary@dot.ca.gov
California Department of Transportation 2006 $100,000.00 Charles Sikorsky Osama Elhamshary Osama_Elhamshary@dot.ca.gov
Federal Highway Administration 2004 $100,000.00 Sheila Duwadi Sheila Duwadi 202- 493-3106 sheila.duwadi@dot.gov
Federal Highway Administration 2005 $250,000.00 Sheila Duwadi Sheila Duwadi 202- 493-3106 sheila.duwadi@dot.gov
New York State Bridge Authority 2005 $50,000.00 William Moreau 845-691-7245
New York State Department of Transportation 2005 $50,000.00 George Christian Gary Frederick 518-457-4645 gary.frederick@dot.ny.gov
New York State Department of Transportation 2006 $50,000.00 George Christian Gary Frederick 518-457-4645 gary.frederick@dot.ny.gov
Texas Department of Transportation 2005 $25,000.00 Tom Rummel Frank Bailey 512- 416-4730 rtimain@txdot.gov
Texas Department of Transportation 2006 $25,000.00 Tom Rummel Frank Bailey 512- 416-4730 rtimain@txdot.gov
Washington State Department of Transportation 2005 $50,000.00 Jugesh Kapur Kim Willoughby 360-705-7978 willouk@wsdot.wa.gov
Wisconsin Department of Transportation 2005 $15,000.00 Lori Richter 608-264-8435 lori.richter@dot.wi.gov
Wisconsin Department of Transportation 2006 $15,000.00 Lori Richter 608-264-8435 lori.richter@dot.wi.gov
Wisconsin Department of Transportation 2007 $15,000.00 Lori Richter 608-264-8435 lori.richter@dot.wi.gov

Background

Most major long span bridges in the United States are vulnerable to terrorism. They are high visibility structures, with a potential for extensive media exposure and public reaction if an incident were to occur. As a result of the long spans, complicated designs, site locations, etc., these bridges have very high replacement costs, and multi-year replacement construction periods. The potential for impacting regional and national economy is also greater because of the increased time for reconstruction. Many of these bridges serve as transportation arteries critical for emergency evacuation and for carrying lifelines besides vehicular traffic. Depending on the location, there is potential for mass casualties because of the volume of traffic it can carry at any given time. Most if not all of these long span bridges cross rivers, bays or other navigational channels. Damage resulting from an attack could impede navigation in addition to disrupting vehicular or other lifeline traffic flows.

Objectives

The objectives of this study are to develop better analytical modeling and numerical analysis capabilities of steel bridge towers subjected to airblast, and to develop retrofit schemes for the towers. The numerical analysis, both with and without retrofits are to be verified through large scale experimental testing.

Scope of Work

The scope consists of analytical and controlled explosive tests on large-scale steel tower sections representative of typical towers in both their as-built and retrofitted configurations to determine performance under various blast scenarios and for verification of numerical analysis techniques. Section sizes and detailing will be carefully determined to insure realistic boundary conditions and applicability to actual towers. It is envisioned that this work will consist of, at the minimum, following tasks done in several phases:

Ø Phase I - Selection of Steel Bridge Towers and Numerical Analysis of As-Built Towers

Task 1 - Select steel bridge towers from existing population of bridges for computer modeling and numerical analysis

Task 2 - Develop drawings for the selected towers to be used in Task 3

Task 3 - Utilizing various levels of tools developed by the military from low resolution prediction code (CONWEP), to medium resolution code (BlastX), to high resolution hydrodynamic code (SHAMRC and FEFLO), and one suitable commercial program, develop models and analyze selected towers to determine behavior in response to a large explosion both in close proximity and with stand-off distances.

Ø Phase II - Experimental Testing of As-Built Towers

Task 1 - Develop experimental test plans, to include determination of representative tower sections, model designs, testbed layout, required bomb sizes, instrumentation plan, etc.

Task 2 - Conduct experimental tests of as built towers for validation of numerical analysis with towers subjected to both close in detonation and with stand-offs

Task 3 - Analyze the experimental results and refine numerical modeling and analytical procedures as necessary

Task 4 - Prepare Report I that summarizes the work from phases I and II including the numerical modeling, test results and correlation of these results to the numerical models.

Ø Phase III - Numerical Analysis and Experimental Testing of Retrofitted Towers

Task 1 - Select blast resistant retrofit schemes for the bridge towers tested in phase II,

Task 2 - Conduct computer modeling and analysis of the retrofit schemes using programs from Phase I

Task 3 - Develop experimental test plans, to include determination of representative tower sections, model designs, testbed layout, required bomb sizes, instrumentation plan, etc.

Task 4 - Conduct experimental tests of retrofitted towers subjected to close in detonation and with stand-offs for verification of the retrofit schemes and validation of numerical analysis.

Task 5 - Analyze experimental results and refine modeling and analytical procedures as necessary

Task 6 - Prepare Report II that summarizes the work under Phase II, including the test results and correlation of these results to the numerical models. The report should provide an analysis of the effectiveness of the tested retrofits and should discuss possible improved retrofit schemes.

Ø Phase IV - Final Report and Executive Summary

Task 1 - Prepare a final report synthesizing the findings of all phases

Task 2 - Prepare an executive summary

Comments

Funds are still being solicited from potential partners. The commitments received to date is $915,000 while the projected amount for fully funding the study is $1,500,000.

The requested minimum contribution is $50K per fiscal year.

Title Type Private
Validation of Numerical Modeling and Analysis of Steel Bridge Towers Subjected to Blast Loadings Solicitation N

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