A Newsletter from CROSS-UK containing reports on structural safety issues.
Note: this Newsletter was published by CROSS (Confidential Reporting on Structural Safety). Since March 2021, Confidential Reporting on Structural Safety is renamed Collaborative Reporting for Safer Structures (CROSS).
Grandstands and dynamic crowd loads
A cantilever football stand vibrated when fans jumped in a synchronised manner and modifications had to be carried out to raise the natural frequency of the structure.
Potential overload on buildings
A reporter raises concerns after a crowd in a city centre greeting a successful sporting team gained access to the roofs of buildings and were densely packed around perimeters overlooking the streets.
Steel fabrication - quality control
A question was raised concerning the quality of some steelwork and the issue of self-certification by the fabricator.
Cladding fixed to stainless steel
Cladding panels fixed to a stainless steel supporting angle with stainless steel screws failed.
Items falling from buildings and structures
A reporter raises concerns about incidents on structures where items have fallen off.
A flat roof with parapets and internal downpipes collapsed after drainage outlets became blocked.
Computer aided design
Concerns are raises after it was discovered that the steel design element of a software package did not automatically allow for nominal moments in the design of columns for simple structures.
Stud framing with self-tapping screws
A reporter raises concerns about contractors not using the specified screws for constructing metal stud frame walls.
Collapse of old masonry walls
There were reports of the collapse of several old masonry walls associated with adjacent construction work.
Latent shear stud defects
Shear studs appeared to be satisfactory when checked with the standard pull-over to five degrees but when hit with a hammer they snapped off.
Concerns over structural design submissions
Concern was expressed about the standard of structural design submissions presented to local authorities.
Local authority resources to check structural calculations
An aspect of local authority work that caused concern to a reporter was the lack of internal resources to check calculations.
Unprotected deep excavation
On a construction site by a busy main road a reporter saw a deep excavation with no internal temporary works.
Design of timber structures
An approximate design led to a timber roof deflecting considerably.
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