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Problem when launching a prestressed beam
When lowered onto its elastomeric bearings, a 40m span post-tensioned ‘I’ beam started to move towards the outer edge of the pier cap.
Temporary movement joint in slabs not installed correctly
Dowels in temporary movement joints for a slab were not installed correctly, impacting the structural behaviour.
Lessons learned from the 2018 Florida bridge collapse during construction
This was a bridge of an unusual design and was being constructed in an unusual manner. The main 53m pre-stressed pre-cast concrete span truss was in position when cracks appeared at a node and over a period of almost three weeks they visibly worsened until collapse occurred.
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.
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.
Quality of design and construction of a major bridge structure
This report concerns the design and installation of the bridge bearing zones on a new prestressed precast concrete viaduct.
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Failure of prestressed hollowcore units during lifting
A reporter raises concerns about how prestressed hollowcore units can fail during lifting if not carefully designed, planned, and managed.
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.
Shear failure during demolition
A reporter raises concerns about how a number of buildings being demolished ‘top-down’ have suffered from partial collapse during the process.
Post-tensioned precast concrete tank failure
A utility company suffered a sudden and catastrophic failure of a concrete tank at a sewage treatment works.