Strength and Serviceability of Damaged Prestressed Girders

Tabatabai, Habib; Nabizadeh, Azam; University of Wisconsin--Milwaukee. Department of Civil and Environmental Engineering

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Strength and Serviceability of Damaged Prestressed Girders

2019-05-01
By Tabatabai, Habib ; Nabizadeh, Azam

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English

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Details:

Creators:

Tabatabai, Habib ; Nabizadeh, Azam

Tabatabai, Habib ; Nabizadeh, Azam Less -
Corporate Creators:

University of Wisconsin--Milwaukee. Department of Civil and Environmental Engineering
Corporate Contributors:

Wisconsin Highway Research Program ; Wisconsin. Dept. of Transportation. Research and Library Unit

Wisconsin Highway Research Program ; Wisconsin. Dept. of Transportation. Research and Library Unit Less -
Subject/TRT Terms:

[+]

Accidental Damage Bridges CFRP Damage Deck Removal Girder Bridges Girders Impacts Over-height Truck Prestressed Concrete Prestressed Concrete Bridges Repair Repairing Serviceability Strcutures Strength Strength Of Materials Stresses Structural Analysis Truck Impact WHRP Wisconsin Department Of Transportation Wisconsin Highway Research Program WisDOT
Publication/ Report Number:

0092-17-02
Resource Type:

Tech Report
Geographical Coverage:

United States ; Wisconsin

United States ; Wisconsin Less -
Edition:

Final Report, October 2016 – May 2019
Corporate Publisher:

University of Wisconsin--Milwaukee
Abstract:

This study addresses the assessment and repair of damaged prestressed bridge girders due to either accidental impact by over-height vehicles on the bottom of the girder, or damage to the top flange of the girder during deck removal operations. Both strength and serviceability limit states are considered. Procedures are developed to calculate changes in service stress due to damage based on a differential approach. The strength calculations are based on the strain compatibility approach. A software program, Prestressed Bridge Assessment, Repair, and Strengthening (PreBARS), has been developed in this study. The program calculates live and dead load forces, distribution factors, prestress losses (refined and approximate), serviceability and strength limit state load combinations, etc. for any point on a bridge with up to three continuous spans. The program also calculates sectional service stresses and strengths for undamaged, damaged and repaired conditions. Repairs may include patches, strand splices, and external Carbon Fiber Reinforced Polymer (CFRP) reinforcement. Application of preload during repair is included in the software. Using the PreBARS program, several case studies were conducted on two prestressed I-girder bridges. Different levels of loss of strands in the bottom flange (up to 25% loss) were simulated on both structures, and various repairs were applied in each case. Similarly, different levels of top flange damage were introduced in both structures up to 50% loss of the top flange. Various damage categories have been defined for both top and bottom flange damage cases. Detailed recommendations have been made regarding inspections, assessment, and repair of damaged prestressed girders for bottom and top damage scenarios.
Format:

PDF
Funding:

WHRP 0092-17-02
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:1f09c5778aaf50890f52e2d71391c0920b824f42d3ba5c8ede240a9e6a9ee1cb
Download URL:

https://rosap.ntl.bts.gov/view/dot/50646/dot_50646_DS1.pdf
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Strength and Serviceability of Damaged Prestressed Girders

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