Structural Safety Information and Reports

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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.

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.

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...

Incompetent design of simple steel beams

This report concerns designs for simple steel beams submitted to building control bodies under Part A of the Building Regulations. The reporter, a checking engineer for a building control body, was not able to accept the effective length and restraints assumed in a number of submitted designs. Most originated from individuals who used proprietary structural design computer packages without, i...

Concerns over corrosion of dissimilar metals in fixing cavity wall tie systems

A reporter is concerned about corrosion that may occur between dissimilar metals that can be used in cavity wall tie systems. The reporter has noted that stainless steel and carbon steel may be fixed together in wall cavities, which are damp environments, and that corrosion of dissimilar metals in contact may occur.

Overall stability of building proposed to be provided by metal framing and plasterboard

Metal framing and plasterboard was used to provide lateral stability to a building. The form of construction was later deemed to be unsuitable and extensive remedial works had to be carried out.

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.

Partial collapse of a shopping mall roof under drifting snow

Partial collapse of a shopping mall roof under drifting snow caused by lack of building code provisions for drifting snow and poor fabrication of open web steel joists.

Incorrect fabrication of balustrade connection

A reporter describes how threaded bars were incorrectly used for a balustrade fixing instead of bolts which led to failure of the connection.

Inadequate design and procurement of large steel roof structure

This report demonstrates the importance of following the correct process for project procurement, including preparing a detailed design and project specification, and certificating compliance with the relevant building codes. It also covers the potential consequences when shortcuts are taken.

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Painted faying surfaces leads to connections with insufficient load capacity

Overloading a portal frame with suspended services

Collapse of unusual hybrid concrete and steel strand truss on school roof

Incompetent design of simple steel beams

Concerns over corrosion of dissimilar metals in fixing cavity wall tie systems

Overall stability of building proposed to be provided by metal framing and plasterboard

Incorrectly installed tension control bolts could have led to serious consequences

Partial collapse of a shopping mall roof under drifting snow

Incorrect fabrication of balustrade connection

Inadequate design and procurement of large steel roof structure

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