oa Civil Engineer in South Africa - Construction and related design aspects of a large span concrete arch bridge



Whereas the construction of large concrete arches had become uneconomical in comparison with structures such as cable-stayed girder bridges, the successful application of sophisticated construction techniques such as the suspended cantilever and related methods has since the late 1960's led to the design and construction of various large span concrete arch bridge. Due to the nature of the interaction between the permanent structure and temporary erection and bracing structures these techniques require a greater degree of expertise than the conventional forms of construction such as formwork supported by centering from the ground. The associated savings in the cost of temporary works and labour are such that for sites with suitable founding conditions the large span concrete arch has again become competitive with other structural configurations in bridge construction.


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