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Title:

Bridge Deck Cracking Structural Investigation with Computer Vision-Informed Infrastructure Condition Assessment
Cover of Bridge Deck Cracking Structural Investigation with Computer Vision-Informed Infrastructure Condition Assessment

Accession Number:

01593568

Record Type:

Component

Abstract:

This research identifies the cause of transverse bridge deck cracking on a steel girder bridge. The study uses high fidelity crack measurements obtained with a computer vision-based infrastructure assessment platform developed at Virginia Tech called OJOS (e.g., eyes in Spanish) to create a 3D digital bridge deck model. Crack measures taken from this model inform structural evaluations that calculate stresses from concrete shrinkage restrained deformation, thermal effects, and service live load. OJOS can scan a bridge deck and accurately identify and measure cracks at 440 ft (134 m) per minute per lane. Measured crack widths from the digital model are on average within ±0.01 in. of those measured by hand with a concrete crack ruler in the field. It is hypothesized that drying shrinkage is the primary cause of transverse cracking based on crack spacing and width statistics assembled from the 3D digital model with secondary contributions from service level live load and temperature strains after concrete placement. Transverse cracks are regularly spaced along the bridge consistent with stresses from restrained deformations, not live load moment gradients. The cumulative crack widths along the bridge correspond to a commonly accepted shrinkage strain range for concrete. The hypothesis is further supported by the calculated composite dead and live load surface crack widths occurring near an interior pier which is 13% of the mean measured crack width of 0.10 in. (2.5 mm). Continued research investment in low shrinkage concrete is recommended to prevent transverse cracking that can lead to premature reinforcement corrosion from deicing salts and reduced service life.

Supplemental Notes:

This paper was sponsored by TRB committee AFF40 Standing Committee on Field Testing and Nondestructive Evaluation (NDE) of Transportation Structures.

Monograph Accession #:

01584066

Report/Paper Numbers:

16-5532

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Salomon, Abraham Lama
Moen, Cristopher D
Sprinkel, Michael M

Pagination:

14p

Publication Date:

2016

Conference:

Transportation Research Board 95th Annual Meeting

Location: Washington DC, United States
Date: 2016-1-10 to 2016-1-14
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Subject Areas:

Bridges and other structures; Highways; Maintenance and Preservation

Source Data:

Transportation Research Board Annual Meeting 2016 Paper #16-5532

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Jan 12 2016 6:24PM