Structural Safety Information and Reports

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Structural safety of reinforced autoclaved aerated concrete (RAAC) planks

A Theme Page to raise awareness of and encourage knowledge sharing on the structural safety of RAAC planks.

RAAC assessment undertaken by persons not suitably experienced

A reinforced aerated autoclaved concrete (RAAC) assessment was carried out by persons who did not appear to have appropriate experience, potentially putting building users at risk of harm.

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.

Accidental partial demolition of a beam

During a site visit, the permanent works design engineer noticed that hydro-demolition of the end of a floor supporting beam had taken place out of sequence. This introduced a pattern of bending moments and shear forces that were not considered in the original design.

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.

Temporary instability of columns

Concerns were raised by a reporter on the temporary stability of concrete columns during construction.

Incorrect lifting system used for precast concrete stair elements

A reporter was asked to inspect a precast concrete stair unit which was exhibiting cracking around the lifting anchor locations after being de-moulded.

Concern over concrete test methods used on site

A reporter is concerned about the test method a contractor uses to justify the strength of concrete placed on site.

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Structural safety of reinforced autoclaved aerated concrete (RAAC) planks

RAAC assessment undertaken by persons not suitably experienced

Concern about rebending starter bars

Accidental partial demolition of a beam

Cantilever bridge parapet falsework failure

Further example of incorrect finite element modelling

Corrosion concerns on a pedestrian bridge

Temporary instability of columns

Incorrect lifting system used for precast concrete stair elements

Concern over concrete test methods used on site

Submit a report

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