Retrofit of Steel Columns

In corrosive industrial environments, such as in mines, loss of capacity of steel columns due to corrosion is a major concern. Even in absence of corrosion, buckling loads often limit the capacity of steel columns. Until the development of super laminates, no practical retrofit options with FRP existed.

Similar to the method described above for concrete columns, a continuous jacket can be constructed around the steel column and the annular space filled with grout (Figure 5). This results in a highly confined composite (concrete + steel) column with much larger load carrying capacity. In addition to the compression capacity of the column, its buckling load is also improved greatly.

 

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