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Collapse of unusual hybrid concrete and steel strand truss on school roof

This report concerns the collapse of a school hall roof which resulted from the failure of one of a number of unusual hybrid concrete and steel strand trusses. The trusses consist of a precast reinforced concrete top chord and verticals with a bottom chord of tensioned steel strands. The failure of the truss resulted in the collapse of the supported flat roof local to the failed truss, and da...

25 May 2023

CROSS Safety Report

Report ID: 1227

Region: CROSS-UK

Incompetent design of simple steel beams

This report concerns designs for simple steel beams submitted to building control bodies under Part A of the Building Regulations. The reporter, a checking engineer for a building control body, was not able to accept the effective length and restraints assumed in a number of submitted designs. Most originated from individuals who used proprietary structural design computer packages without, i...

24 May 2023

CROSS Safety Report

Report ID: 1183

Region: CROSS-UK

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.

24 May 2023

CROSS Safety Report

Report ID: 1196

Region: CROSS-UK

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.

6 April 2023

CROSS Safety Report

Report ID: 855

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

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

Poor quality design leads to failure for a small design and build contract

An example of a small design and build contract where poor design and management led to an inadequate structure being built.

6 June 2022

CROSS Safety Report

Report ID: 1088

Region: CROSS-UK

Dangerous building work on domestic project

Temporary propping fails during works to a semi-detached property putting the whole building at risk of collapse.

10 March 2022

CROSS Safety Report

Report ID: 1062

Region: CROSS-UK

Incorrect steel lintel installation

A reporter came across several issues, associated with the installation of steel beam lintels, while carrying out inspection works on a 1950’s domestic property.

13 December 2021

CROSS Safety Report

Report ID: 1008

Region: CROSS-UK

Problem when launching a prestressed beam

When lowered onto its elastomeric bearings, a 40m span post-tensioned ‘I’ beam started to move towards the outer edge of the pier cap.

30 July 2021

CROSS Safety Report

Report ID: 1027

Region: CROSS-UK

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