Is FRP grating stronger than steel grating?
Per unit weight FRP is very strong, but for a given panel depth steel bar grating carries higher loads. FRP wins on corrosion resistance, light weight and being non-conductive, so it is chosen for chemical, water and marine service while steel handles the heaviest structural loads.
Steel's high stiffness (modulus) lets a given bar depth carry more and deflect less than the same depth of FRP, which is why steel dominates heavy structural platforms. FRP compensates with deeper pultruded bars and by never corroding.
So the honest answer is "it depends what you mean by strong": steel for raw load capacity and stiffness, FRP for strength that survives decades in a corrosive, wet or electrified environment where steel would fail.
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