Investigation of Steel-Stringer Bridges: Superstructures and Substructures, Volume II, TR-522, 2007

(2007) Investigation of Steel-Stringer Bridges: Superstructures and Substructures, Volume II, TR-522, 2007. Transportation, Department of


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Problems with unknown bridge foundations in Iowa are often associated with timber substructures. Timber piles are subject to biological and physical deterioration, which makes quantifying in-service pile capacity difficult. Currently there are no reliable means to estimate the residual carrying capacity of an in-service deteriorated pile; and thus, the overall safety of the bridge cannot be determined. The lack of reliable evaluation methods can lead to conservative and costly maintenance practices. This research study was undertaken to investigate procedures for assessing bridge substructures, and evaluating procedures for rehabilitating/strengthening/replacing inadequate substructure components. The report includes an extensive literature review, a field reconnaissance study of 49 bridges, a survey of substructure problems from the perspective of County Engineers, a laboratory study aiming to correlate nondestructive tests to residual pile strength and stiffness values, nondestructive and destructive load tests for 6 bridges with poor substructures, and finally a laboratory study evaluating selected repair methods.

Item Type: Departmental Report
Keywords: Bridge foundations, Bridge substructures, Deterioration by environmental action, Load tests, Maintenance, Nondestructive tests, Performance evaluations, Repairing, Test piles, Timber construction, Wooden bridges
Subjects: Transportation
Transportation > Bridges and tunnels
Transportation > Research
Transportation > Design and Construction
Transportation > Maintenance and preservation
ID Code: 19977
Deposited By: Iowa DOT Library
Deposited On: 30 Jun 2015 12:11
Last Modified: 30 Jun 2015 12:11