Precast Flooring Federation issues data sheet
Since its inception 20 years ago, the Precast Flooring Federation has maintained an active policy of providing up-to-date technical assistance to the industry. The latest of its series of data sheets deals with Approved Document A for England and Wales, which was published in June 2004 and comes into effect from December 2004. The main aim of Approved Document A is to improve safety for persons both in and near buildings by providing clear guidance on loading and ground movement.
One of the changes being introduced concerns Requirement A3 Disproportionate Collapse which states that: “The building shall be constructed so that in the event of an accident the building will not suffer collapse to an extent disproportionate to the cause” – in that buildings of fewer than five storeys are now covered. The new guidance provided in the data sheet splits structures into categories depending on the risk factor and the consequences of an accidental failure. These parameters depend on the type of the building, the likelihood of accidents and the number of people that may be affected. For each category, specific guidance is given on the need for horizontal ties, vertical ties and other measures that need to be taken.
The data sheet also deals with design aspects and the requirements relating to ties in precast concrete floors given in BS 8110. There is clarification given on perimeter floor ties, internal ties, peripheral ties and vertical ties. Typical details are provided, with diagrams, both for hollow-core floors and for beam-and-block floors.
For copies of the datasheet contact: Clive Budge, Precast Flooring Federation, tel: +44 (0)116 253 6161; e-mail: CJB@britishprecast.org or visit www.pff.org.uk
Copyright The Concrete Society 2004
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