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Overloading a portal frame with suspended services
A reporter designing a single storey portal frame used a standard roof service loading of 0.25kN/m2. After the project was completed, a tenant for the unit took over fit out and added a considerable amount of sprinkler pipework into the roof. This created local overloading.
21 August 2023
CROSS Safety Report
Report ID: 1195
Region: CROSS-UK
Painted faying surfaces leads to connections with insufficient load capacity
Painted, rather than the required unpainted connection faying surfaces, were identified by the Resident Engineer of a reporter's firm during the erection of a primary frame for a large project. The painted surfaces resulted in the connections not having sufficient load carrying capacity and necessitated remedial works.
20 November 2023
CROSS Safety Report
Report ID: 896
Region: CROSS-UK
Structural failure of older timber connections
A reporter shares three examples of the structural failure or inadequacies of connections in existing timber structures that they have encountered.
13 December 2021
CROSS Safety Report
Report ID: 1040
Region: CROSS-UK
Timber truss
The reporter has been dealing with an application where the engineer involved discovered proprietary timber girder trusses with some glued joints that have come loose.
1 February 2007
CROSS Safety Report
Report ID: 62
Region: CROSS-UK
Low pitched metal sheet roofs
A reporter is concerned about low pitch metal sheet roofing attached to trussed rafters.
1 April 2007
CROSS Safety Report
Report ID: 66
Region: CROSS-UK
Collapse of proprietary timber roof
A proprietary timber roof system spanning 8m over a school hall collapsed. The roof was constructed in 1959, and formed from a ply-web beam system, with hardboard ceiling and ply deck and asphalt covering.
1 January 2012
CROSS Safety Report
Report ID: 273
Region: CROSS-UK
Design deficiencies in long span steelwork portal
A firm commissioned to design steel joints on a large portal frame structure noticed that there was lack of restraint to a series of long span rafters.
1 October 2013
CROSS Safety Report
Report ID: 329
Region: CROSS-UK
Timber roof truss bracing problem
Lateral movement of the roof tiles on a two-storey mid-terrace house built approximately 35 years ago with a trussed rafter roof led to the discovery of broken bracing.
1 July 2014
CROSS Safety Report
Report ID: 354
Region: CROSS-UK
Partial roof collapse at shopping centre
There was a recent partial roof collapse at a shopping centre which was, says the reporter, built in the early 1970s in a form which may have been used extensively throughout the UK during this period and possibly beyond.
1 October 2013
CROSS Safety Report
Report ID: 395
Region: CROSS-UK
Lack of lateral stability in steel frame
Concerns were raised after the steel frame of a building was found to have a lack of horizontal and vertical bracing.
1 July 2016
CROSS Safety Report
Report ID: 540
Region: CROSS-UK
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