Sunday, 9 November 2014

Cable-stayed bridge in Southport

This isn't a suspension bridge because the cables are angled and not vertical. On a suspension bridge, there are two parallel cables from shore to shore and then vertical cables hang down to hold the deck. Here, the cables provide a vertical component to hold up the bridge deck but there is also a horizontal component towards the support. This means that the material from which the deck is made needs to be more rigid than that for a suspension bridge. Its compressive strength must be greater. This isn't quite a classic cable-stayed bridge because it is actually anchored to the shore on the left. It is possible to have two halves of the deck hanging from a single central pillar because then the horizontal components pulling in towards the pillar from left and right can be made to balance with no need for an anchor on the banks.