Structural Safety Information and Reports

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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.

Reinforced aerated autoclaved concrete planks found on pitched roof of 1990s hospital building

A building constructed in the early 1990s has been found to contain reinforced aerated autoclaved concrete (RAAC) planks. This date is important since it is much later than the previously thought last significant use of RAAC in buildings in the UK and potentially affects the scope of buildings that could require screening for RAAC problems.

Precast concrete panel fixing

A 1960s flyover was being demolished and an interesting feature came to light how the precast concrete edge panels were fixed.

Failure of prestressed hollowcore units during storage and transport

A reporter shares their experience of the failure of prestressed hollowcore units during storage and transport.

Failure of cast-in wire lifting loops on manhole cover slabs

A cast-in wire lifting loop failed when lifting a 4m diameter precast manhole cover slab into place.

Channel slab roof deck collapse during reroofing

This report highlights the structural risk caused by machinery during reroof a project.

Roof collapse of warehouse structure under rainwater ponding

This report highlights the structural risk caused by rainwater ponding on relatively flat roofs.

Grouting of joints between load-bearing prefabricated concrete members

This report highlights the risk of failure if grouted joints between load-bearing prefabricated concrete members are not designed and installed correctly.

The use of cast-in ferrules as structural connections

This report highlights several problems that can arise with structural connections between elements when cast-in ferrules (also known as threaded inserts) are used for the anchorage of reinforcing bars.

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Temporary instability of columns

Incorrect lifting system used for precast concrete stair elements

Reinforced aerated autoclaved concrete planks found on pitched roof of 1990s hospital building

Precast concrete panel fixing

Failure of prestressed hollowcore units during storage and transport

Failure of cast-in wire lifting loops on manhole cover slabs

Channel slab roof deck collapse during reroofing

Roof collapse of warehouse structure under rainwater ponding

Grouting of joints between load-bearing prefabricated concrete members

The use of cast-in ferrules as structural connections

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