Structural Safety Information and Reports

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Punching shear in concrete slabs at perimeter columns

A reporter raises concerns about the underestimation of bending moments in perimeter columns when assessing punching shear in adjacent concrete slabs. Punching shear failures can be brittle and catastrophic. Designers need to include the appropriate ultimate moment in the design actions.

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.

Continuously threaded reinforcing bar

This report highlights the difficulty of inspecting continuously threaded reinforcing bars to ensure that they have been adequately inserted into the cast-in ferrules.

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.

Concern over modelling of concrete frame building for construction stage

Independent check shows inadequate modelling of concrete frame building with transfer slab.

Concerns about punching shear in a flat slab

This report concerns potential shear failures in flat slabs. This originates from inconsistent design and detailing of the shear reinforcement where a proprietary shear link system is assumed in the design but not followed in detailing.

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Waterproofing exposed concrete slabs

This report highlights that water ingress into buildings continues to be a problem and discusses the role of the structural engineer when dealing with waterproofing of exposed concrete slabs. It shows how this can be achieved by careful design and detailing of the reinforced concrete structure and by close collaboration of all parties involved.

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Punching shear in concrete slabs at perimeter columns

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

Continuously threaded reinforcing bar

Failure of prestressed hollowcore units during storage and transport

Concern over modelling of concrete frame building for construction stage

Concerns about punching shear in a flat slab

Share your knowledge

Waterproofing exposed concrete slabs

Temporary movement joint in slabs not installed correctly

Inadequate punching shear reinforcement in flat slabs

Fire risks in multi-storey car parks

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