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CROSS regions
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
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
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
Steelwork splices do not match design calculations
Remedial works had to be carried out after it was found that steelwork splices on site did not match calculations which were retrospectively provided by a contractor.
29 March 2021
CROSS Safety Report
Report ID: 916
Region: CROSS-UK
Workmanship in domestic buildings
A reporter has raised concerns after discovering a steel beam on site had its web cut away at the support without approval from the design engineer.
14 October 2020
CROSS Safety Report
Report ID: 971
Region: CROSS-UK
Execution not matching design assumptions
This report highlights how the connection of steel columns to twin beams acting as a transfer beam was overlooked and created an eccentric loading condition.
14 October 2020
CROSS Safety Report
Report ID: 968
Region: CROSS-UK
Repeating the same design mistakes
A correspondent who investigates engineering failures has shared common errors which engineers keep repeating.
1 October 2019
CROSS Safety Report
Report ID: 858
Region: CROSS-UK
Inadequate billets used in precast concrete connections
Whilst completing a third-party design appraisal, a correspondent found that solid steel billets intended to form the primary shear transfer mechanism between concrete beams and columns were insufficient for this purpose.
1 April 2019
CROSS Safety Report
Report ID: 705
Region: CROSS-UK
Dangerous modification during construction of five storey block of flats
A reporter was asked to investigate a five storey timber framed block of flats after the leaseholder of the top floor reported gaps appearing between oak floorboards.
1 January 2018
CROSS Safety Report
Report ID: 699
Region: CROSS-UK
Serious safety failings of high level lattice girder walkways
A reporter discusses extremely serious safety failings with the construction of two new high level lattice girder walkways in the fly tower of a theatre.
1 January 2018
CROSS Safety Report
Report ID: 697
Region: CROSS-UK
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