Evaluate Use of 300ksi Strands for TxDOT Prestressed Girders
Advances in material and fabrication processes have allowed the prestressing-strand industry to increase the strength of strands from 270 ksi to 300 ksi. Several state DOTs around the nation are already considering incorporating higher strength strands into their designs. The impetus is to obtain longer bridge span lengths for a given section depth. The main goal of this research project is to update the designs of standard Texas DOT prestress girders to incorporate 300 ksi 0.6 inch diameter strands. The main concern for upgrading to 300 ksi strands revolves around the increased spalling and bursting stresses associated with higher prestressing forces. Such increases in stresses can cause increased cracking in girders at prestress transfer. The research team will conduct tests on full-scale prestressed girders for all standard TX girder section sizes. These tests will allow the research team to hone in on optimal detailing for girders using 300 ksi strands. As a result, new designs for all TX girder sections shall be produced for 300 ksi strands. Updates to design specifications shall also be proposed to reflect research findings. The expected benefits are more economical bridges that can span longer distances for a given section depth.
Language
- English
Project
- Status: Active
- Funding: $849245
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Contract Numbers:
0-7154
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Sponsor Organizations:
Texas Department of Transportation
125 E. 11th Street
Austin, TX United States 78701-2483 -
Managing Organizations:
Texas Department of Transportation
125 E. 11th Street
Austin, TX United States 78701-2483 -
Project Managers:
Schwerdt, Tom
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Performing Organizations:
University of Texas at San Antonio
One UTSA Circle
San Antonio, TX United States 78249 -
Principal Investigators:
Ghannoum, Wassim
- Start Date: 20220919
- Expected Completion Date: 20250831
- Actual Completion Date: 0
Subject/Index Terms
- TRT Terms: Bridge design; Girders; Prestressing; Specifications; Steel
- Subject Areas: Bridges and other structures; Design; Highways; Materials;
Filing Info
- Accession Number: 01863348
- Record Type: Research project
- Source Agency: Texas Department of Transportation
- Contract Numbers: 0-7154
- Files: RIP, STATEDOT
- Created Date: Nov 3 2022 4:43PM