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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
Precast concrete panel fixing
A 1960s flyover was being demolished and an interesting feature came to light how the precast concrete edge panels were fixed.
30 June 2022
CROSS Safety Report
Report ID: 965
Region: CROSS-UK
Steel balconies fixed to precast hollowcore floor planks
A reporter is concerned about the suitability of providing a retrofitted steel balcony requiring moment connections to the sides of typical hollowcore floor planks.
1 July 2017
CROSS Safety Report
Report ID: 620
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
Design responsibility for steel to concrete connections
A reporter provides an illustrative example to support their view that the design responsibility for steel to concrete connections should be shared between the responsible designers of both materials, and that a Lead Designer should ensure all designs are properly integrated.
20 February 2024
CROSS Safety Report
Report ID: 1261
Region: CROSS-UK
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