Structural Enhancement Using Resin Bonded Steel and Carbon Fibre Plates
Plate bonding is a well established concept whereby steel plates are applied to plane concrete surfaces using epoxy resin adhesive and bolted fixings.
The technique is used to provide additional resistance to bending, improve load capacity or reduce deflections, and is particularly useful as a retrospective method when changes in use in a building, or perhaps increased vehicle loadings on a bridge structure need to be addressed.
Recent developments in material technology have seen the introduction of carbon fibre plates, which are significantly lighter and easier to install than steel plates of similar capacity.
Carbon fibre fabric is now also used to strengthen columns and beams using a wrapping technique. Single or multiple layers of uni or bi-directional fabric are impregnated with resin adhesive and applied to sections such as beams and columns to improve strength.
The technique is used particularly to improve bursting or impact resistance for columns on high way bridge structures.
Schemes undertaken by Ram Services include some of the well documented early uses of plate bonding such as the M1 Brinsworth Bridge at Sheffield (for South Yorkshire County Council).
Ram Services Limited also undertook the first and most extensive use of carbon fibre plates for the UK Highways Agency on the A34 Barnes Bridge over the M60 south of Manchester.
INFORMATION
Ram Services Limited were one of the earliest exponents of steel plate bonding in the UK, and pioneered a technique where plates are applied to a structure “dry”, and the resin adhesive then introduced by injection methods.
Such a procedure is particularly useful where substrates are uneven, and has been used successfully to bond steel plates to riveted steel plate girders.
Examples of Past Work
M60/A34 Barnes Bridge Manchester for the Highways Agency
Piccadily Gardens Pumping Station for Manchester CC