Originally, costs, structural and esthetics. Bridges tend to experience torsion for a variety of factors. The covered part historically provides additional rigidity without supports below into the water. It also protects the covered area from bad weather.
As building materials and engineering improved its now largely about esthetics.
Originally, costs, structural and esthetics. Bridges tend to experience torsion for a variety of factors. The covered part historically provides additional rigidity without supports below into the water. It also protects the covered area from bad weather.
As building materials and engineering improved its now largely about esthetics.
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