Details:

Creators:
Okeil, Ayman M.
Corporate Creators:
Louisiana State University. Dept. of Civil and Environmental Engineering
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Continuous Girder Bridges Creep Data Collection Field Studies Live Loads Monitoring Prestressed Concrete Structural Analysis Structural Health Monitoring
Publication/ Report Number:
FHWA/LA.14/526
Resource Type:
Tech Report
Geographical Coverage:
Louisiana
Corporate Publisher:
Louisiana. Dept. of Transportation and Development
Abstract:
This report summarizes findings from monitoring data that was collected over a two-year period from Bridge No.

61390613004101 in the John James Audubon Project, which was formerly designated as Bridge #2 prior to

construction completion. The bridge was instrumented as part of an earlier project (LTRC Project No. 08-1ST).

Results from the first monitoring project warranted resuming data collection to monitor the performance of Bridge

No. 61390613004101 over a longer period of time. The focus of the monitoring effort for both projects is on the

employed continuity detail, which is based on the recommendation of the National Cooperative Highway Research

Program (NCHRP) Final Report 519. Continuity details are typically used to eliminate the needs for high-maintenance joints that often lead to the acceleration of element deterioration near the joints. The employed

positive moment continuity detail transfers forces between adjacent girders via positive moment reinforcement that

extends out of the bottom flanges of the prestressed concrete (PSC) girders into a continuity diaphragm.

The 96-channel monitoring system that was installed as part of Project 08-1ST was reactivated in February 2012.

Data from the embedded and surface-mounted sensors that measure strains, temperatures, rotations, and gap

openings in critical locations in the monitored segment were collected for a period of two years. The collected data

from both projects (12-1ST and 08-1ST) was analyzed and interpreted. Furthermore, four field visits were

conducted to document the condition of the girder ends in the monitored segment.

Recommendations based on the project findings are drawn. Data shows that 5 years after the construction of the

bridge, some long-term effects such as creep and shrinkage have diminished. It is also evident that temperature

effects are still a major factor that continues to strain the bridge in such a way that should not be ignored in the

design of bridges with similar continuity details. The high-localized strains at girder ends due to thermal variation

caused cracking in a few girder ends.


Format:
PDF
Funding:
12-1ST ; 30000546
12-1ST ; 30000546 Less -
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:292f4b22e1b17ba9f695611cb98dbea7c7e3c0b4fc12cb434c7f476e86633f29
Download URL:
https://rosap.ntl.bts.gov/view/dot/28349/dot_28349_DS1.pdf
File Type:

Supporting Files

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