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Gateway to confusion

With regard to the recent article on the Brisbane Gateway (NCE 21 August), an arch bridge is one where the weight of the bridge and the vertical loading is supported by the arching action and hence thrust from the abutments.

I can see that the bridge at Brisbane has a curved soffit, but it is surely a beam bridge depending on bending, not an arch bridge depending on horizontal thrust from abutments.

DONALD DALTON, d.dalton@lineone.net

Editor's note: Our photograph does not show the whole of the main span, which is in fact a balanced cantilever.

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