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CROSS Safety Report

Deflection of bridge girder under load

Report ID: 557 Published: 1 July 2016 Region: CROSS-UK

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Overview

A report was received from a bridge examiner to say outer main girder of a short span railway bridge was moving up to 30mm under load.

Key Learning Outcomes

For asset owners and managers:

  • This report demonstrates how regular inspections can help identify any safety issues that may need to be addressed

  • A strict inspection and maintenance programme can also help keep a structure safe and operational

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A report was received from a bridge examiner to say outer main girder of a short span railway bridge (Figure 1) was moving up to 30mm under load. The girder was reported to be rocking outwards at the bottom flange which was indicated by the handrail moving inwards towards the running rail.

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Figure 1: general view of railway bridge before strengthening works

The girder was also pumping under load at both abutments. Subsequent strengthening consisted of three underslung beams spanning between the edge girder and centre main girder with two beams spanning the abutments supporting the trough decking directly under the rail (Figure 2). A new deck is planned.

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Figure 2: intermediate strengthening works

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