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).
Failure of RAAC planks in schools
A reporter was asked to investigate a reinforced autoclaved aerated concrete (RAAC) roof which had collapsed in a school.
Structural issues with cladding
A reporter who investigates cladding failures shares common issues they have encountered.
Post-tensioned slab failure during tendon stressing operations
A reporter disseminates the lessons learned after the end of a slab burst while stressing the tendons in a post-tensioned concrete slab.
Unconservative design of flat slab due to software modelling issues
A reporter discusses how a design/modelling problem caused an under-designed reinforced concrete (RC) slab to be constructed.
Missing punching shear reinforcement in concrete slabs
A reporter raises concerns of how two separate engineers observed the omission of design punching shear reinforcement prior to slab pours being undertaken on two different sites.
Propping of post-tensioned slabs during construction
A reporter raises their concerns after an infill slab strip was not poured in time which resulted in overloading of the slab below during a concrete pour.
Suspended ceiling replacement in high rise block
A reporter was involved in replacing a suspended ceiling after a few loose panels had fallen, resulting in a minor injury in one case.
Crane outrigger loads underestimated due to misuse of software
A reporter is concerned about how the misuse of software can lead to incorrect outrigger loads being used in the design of foundations for crane outriggers.
Dangerous substitution of lintels on domestic projects
This report highlights the structural risk of substituting lintels during domestic projects without approval from the design engineer.
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