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Title:

Monitoring of a Bascule Bridge during Construction
Cover of Monitoring of a Bascule Bridge during Construction

Accession Number:

01593572

Record Type:

Component

Abstract:

The risk of member/connection distress or even overall collapse of bridge structures under significant rehabilitation efforts is generally greater than when subject to normal operating conditions and hazards. This is particularly evident for movable structures. Currently, visual inspection during construction is the most common source of assurance a bridge owner has that the structure is functioning properly. Complex structures like movable bridges may benefit from additional oversight beyond visual inspection because of the elevated risks. Structural health monitoring of critical elements can help reduce these risks. A case study is presented for the first monitoring effort of a rolling lift bascule bridge under rehabilitation. During an opening of the span for ship traffic, a 460µε (92MPa or 13.3ksi) shift in strain response was measured in the truss lower chord. To identify the root cause of this behavior, a detailed investigation was performed including field studies, interviews and model-experiment correlation. It was concluded that a connection slip occurred at a partially completed repair. Fortunately the structural system utilized on this bascule span includes a redundant truss which allowed for redistribution of forces. In this scenario, the primary impact of the monitoring was a change to the construction sequence allowed by the contractor. This investigation shows the potential benefit of instrumentation and monitoring in conjunction with traditional visual assessment methods, specifically during construction and retrofit of a movable bascule bridge.

Supplemental Notes:

This paper was sponsored by TRB committee AFF10 Standing Committee on General Structures.

Monograph Accession #:

01584066

Report/Paper Numbers:

16-5822

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Yarnold, Matthew
Weidner, Jeffrey

Pagination:

15p

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; References; Tables

Uncontrolled Terms:

Visual assessment study

Subject Areas:

Bridges and other structures; Construction; Highways; Safety and Human Factors

Source Data:

Transportation Research Board Annual Meeting 2016 Paper #16-5822

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Jan 12 2016 6:33PM