Details:

Creators:
Harries, Kent A. ; Kasan, Jarret ; Aktas, John
Harries, Kent A. ; Kasan, Jarret ; Aktas, John Less -
Corporate Creators:
University of Pittsburgh. Dept. of Civil & Environmental Engineering
Corporate Contributors:
Pennsylvania. Dept. of Transportation. Bureau of Planning and Research
Subject/TRT Terms:
[+]
Bridge Design Bridges Bridges--Pennsylvania Girders Prestressed Concrete Bridges
Publication/ Report Number:
FHWA-PA-2009-008-PIT 006
Resource Type:
Tech Report
Geographical Coverage:
Pennsylvania
Edition:
Final report.
Corporate Publisher:
Pennsylvania. Dept. of Transportation
Abstract:
It is common practice that aging and structurally damaged prestressed concrete bridge members are taken out of service and replaced.

This, however, is not an efficient use of materials and resources since the member can often be repaired in situ. There are numerous

repair techniques proposed by entrepreneurial and academic institutions which restore prestressed concrete girder flexural strength and

save both material and economic resources. Of course, not all repair methods are applicable in every situation and thus each must be

assessed based on girder geometry and the objectives of the repair scenario. This document focuses on the practical application of

prestressed concrete bridge girder repair methods.

In this document, repair methods are presented for three prototype prestressed concrete highway bridge girder shapes: adjacent boxes

(AB), spread boxes (SB), and AASHTO-type I-girders (IB), having four different damage levels. A total of 22 prototype repair designs

are presented. Although not applicable to all structure types or all damage levels, the repair techniques covered include the use of

carbon fiber reinforced polymer (CFRP) strips, CFRP fabric, near-surface mounted (NSM) CFRP, prestressed CFRP, post-tensioned

CFRP, strand splicing and external steel post-tensioning. It is the authors’ contention that each potential structural repair scenario

should be assessed independently to determine which repair approach is best suited to the unique conditions of a specific project.

Therefore, no broad classifications have been presented directly linking damage level (or a range of damage) to specific repair types.

Nonetheless, it is concluded that when 25% of the strands in a girder no longer contribute to its capacity, girder replacement is a more

appropriate solution. Guidance with respect to inspection and assessment of damage to prestressed concrete highway bridge girders

and the selection of a repair method is presented. These methods are described through 22 detailed design examples. Based on these

examples, review of existing projects and other available data, a detailed review of selection and performance criteria for prestressed

concrete repair methods is provided.

Best practices based on the study objectives are presented.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:51ad1a0a38b3f3080aa2c74cde1e9e9bb0e26227c3c6ec34ee872506c0e69eff
Download URL:
https://rosap.ntl.bts.gov/view/dot/16951/dot_16951_DS1.pdf
File Type:

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