Structural Safety Information and Reports

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Concern about rebending starter bars

This report concerns the bending and rebending of starter bars on site during the construction of a multi storey tower. The reporter considered that such a practice could compromise the structure under extreme load conditions.

Incorrectly installed tension control bolts could have led to serious consequences

A reporter finds incorrectly installed system HRC preload bolt assemblies, better known as tension control bolts, during a site inspection of a new highway bridge over a railway. The incorrectly fitted bolts could have had major structural implications, and led to other safety risks, if the installation error had not been spotted.

Inadequate bridge bearing pad installation

During the final construction phase of a reinforced concrete bridge deck, the contractor installed the elastomeric bridge bearing pads using a non-approved and potentially dangerous methodology.

Wrong length blind bolts lead to unsafe bridge structure

Bridge strengthening being carried out using blind bolts left a structure in an unsafe condition with traffic loading on it.

Cantilever bridge parapet falsework failure

A reporter has experienced the failure of cantilever parapet falsework twice, for different reasons, using two different products during bridge construction.

Further example of incorrect finite element modelling

Concerns in respect of the sufficiency of finite element modelling of masonry walls as part of a reinforced concrete framed building.

Corrosion concerns on a pedestrian bridge

A reporter is concerned about a pedestrian bridge that may have reduced load capacity due to corrosion at the root of cantilever supports.

Concerns over execution class categorisation of steel pedestrian bridge

A reporter is concerned in respect of the steelwork execution class, and quality management arrangements, applied to the construction of a public access pedestrian bridge.

Stunts on bridges cause concern

A thrill-seeker travelling up and over the arch of a bridge, risking serious injury to themselves and others, raises the concerns of a reporter.

Connection fixity considerations for steel frame modelling

This report concerns the modelling of joints when using computer programs. In some cases, engineers are applying rotational releases to joints in models but subsequently designing the connections as rigid. This leaves a fundamental mismatch between analysis and design which may lead to unsafe structural connections argues a reporter.

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Concern about rebending starter bars

Incorrectly installed tension control bolts could have led to serious consequences

Inadequate bridge bearing pad installation

Wrong length blind bolts lead to unsafe bridge structure

Cantilever bridge parapet falsework failure

Further example of incorrect finite element modelling

Corrosion concerns on a pedestrian bridge

Concerns over execution class categorisation of steel pedestrian bridge

Stunts on bridges cause concern

Connection fixity considerations for steel frame modelling

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