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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.
Disproportionate collapse assessment of large panel system buildings
A reporter has become concerned by the approach being taken by some engineers to assess the risk of disproportionate collapse due to fire in large panel system (LPS) buildings.
Design responsibility for temporary stability of steel frame building
A reporter raises concerns about the division of responsibility for the temporary stability of a four-storey steel frame structure with precast concrete planks and a structural topping.
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.
Casting, transporting and installing precast concrete kerbs
A reporter shares their experience of how collaborative engineering thinking involving several parties enabled a design solution to be found that could be constructed safely.
Failure of cast-in lifting anchor on precast twin-wall
A precast reinforced concrete twin-wall panel was being lifted when one of the cast-in lifting anchors suffered a brittle failure.
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Failure of cast-in lifting eye on L-shaped wall
During a routine lifting operation of a L-shaped wall unit, one of the legs on a cast-in lifting eye which was located on top of the unit pulled out of the concrete.
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.
Toppling of precast concrete unit during lifting causes serious injury
During a routine lifting exercise of a precast concrete unit, the unit tipped over while a worker was unslinging the top sling points for the unit using a ladder, causing them a serious injury.
Inadequate bolted connections supporting stairs
Concerns are raised over the safe design and installation of rolled steel angles (RSA) used to support heavy precast stair and landing units.