Under-strength columns

Column wrapping is a technique perfected by Weber using a variety of specialist unidirectional or woven fibre sheets bonded with a strong epoxy glue. Many bridges and buildings have been repaired using this novel technique.


Problems & Solutions

Issues you may face

Reinforced concrete columns carry and transfer load from beams and slabs down to the foundations of the structure. Additional loads or deterioration of the column can result in overloading of the column, causing buckling and cracking of the columns. Shear cracks can develop when the column is severely overloaded.

Excessive loads to reinforced concrete columns can result in 3 failure modes:

1. Buckling

Bending of the column due to insufficient flexural bending reinforcement.

2. Shear

Insufficient shear reinforcement causes structural cracks.

3. Impact damage

Vehicle strikes, blast impact or physical impact can weaken the structural strength of columns.


Install manual lamination sheet wrap using either carbon, aramid or glass sheet depending upon the specific design and/or near-surface mounted reinforcement, NSM, cut-in laminates.

NSM cut-in laminate

Slots are cut vertically down the column face and 10mm or 20mm wide carbon fibre plate is glued into position to strengthen against flexural buckling. Use webertec force carbon plate.

Sheet wrap

Externally bonded sheet to strengthen for axial load and shear load to the column. Use:

The edges of the structural member must be rounded by grinding to achieve a minimum radius of 15mm.

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If you have any questions or would like assistance, please feel free to get in touch with us.

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