Accommodating building deflection

The clear joint below should be at least 10mm where there is a single storey height of brickwork below the support system.Where there are two storeys or more of brickwork below the support system, the clear joint should be sufficient to accommodate all expected movements. Damp-proofing is normally located at the support position.Deflection is a collective issue in the building industry, but it’s not on a level playing field, says Rob Judd, Managing Director of Optima Contracting Ltd, one of the largest installers of partitioning systems incorporating deflection heads. Together, we need to understand deflection, accept that it’s there and work collectively to accommodate it.It’s naive to believe that deflection heads are being over-specified, particularly in large London offices.The question of accommodating sway in the chilled water, domestic water, and fire protection piping systems was not just about how much the structure would move, but also about how quickly it would move given acceleration of the movement.Taking into consideration these design challenges, SOM chose to specify grooved mechanical pipe joining systems for these piping systems.To allow for a vertical movement of around 1mm per metre, in buildings exceeding four storeys or 12 metres in height, movement joints are generally positioned at every storey or every second storey.

Its elevator has the longest travel distance in the world and it has the tallest service elevator in the world.

Deflection in beams is a major issue in structural design.

Engineers adopt deflection limits which suit the nature of the building.

Wall ties should be incorporated within 300mm above and below the support.

It is important to select the correct support system to ensure that building tolerances can be accommodated. Ancon brackets have a slot at the back to provide vertical adjustment. Longitudinal adjustment is provided by an Ancon cast-in channel in concrete structures, or horizontally slotted holes in steel framed structures.

Accommodating building deflection