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Failure of cantilevered stone staircase

During the renovation and change-of-use conversion of a former minor stately home built around 1830, under pedestrian loading, a ‘cantilevered’ stone staircase partially collapsed without warning.

21 February 2023

CROSS Safety Report

Report ID: 1147

Region: CROSS-UK

RAAC planks in a 1970s shopping centre

An existing large shopping centre built circa 1975 had a number of external storerooms and loading bays with roofs constructed using reinforced autoclaved aerated concrete (RAAC) planks. The planks had deflected to the extent that they needed replacing.

20 February 2023

CROSS Safety Report

Report ID: 1155

Region: CROSS-UK

Construction period of RAAC planks

A reporter says that there are structural issues with reinforced autoclaved aerated concrete (RAAC) panels installed in a building as late as 1998. This date is significantly later than previous reports suggest as the last significant use of RAAC elements in the UK.

20 February 2023

CROSS Safety Report

Report ID: 954

Region: CROSS-UK

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.

20 February 2023

CROSS Safety Report

Report ID: 1145

Region: CROSS-UK

Inadequate design for basement works

An inadequate structural design for alterations to a basement led to structural distress within a substantial five-storey townhouse.

21 November 2022

CROSS Safety Report

Report ID: 1132

Region: CROSS-UK

Critical welding of structural steelwork missed

The designer of a steelwork roof frame found a critical fabrication error when inspecting steelwork on site before it was erected.

21 November 2022

CROSS Safety Report

Report ID: 1126

Region: CROSS-UK

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.

17 November 2022

CROSS Safety Report

Report ID: 1139

Region: CROSS-UK

Incorrect modelling of a cantilever

A steel framed building was incorrectly modelled and designed resulting in excessive deflection of part of the frame even before the frame was loaded with the self-weight of the building.

17 November 2022

CROSS Safety Report

Report ID: 1144

Region: CROSS-UK

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.

14 October 2022

CROSS Safety Report

Report ID: 1122

Region: CROSS-AUS

Floor vibration in a gym

Vibration within the floor structure of a second floor gym gives rise to concern of structural resonance and possible fatigue of structural members.

26 August 2022

CROSS Safety Report

Report ID: 1106

Region: CROSS-UK

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