Swinging bridge designs
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One disadvantage of the simple pivoting bascule bridge, as shown in Figures 4 a and b , is that the mass of the cantilever has to be balanced whilst pivoting in order to keep the power requirements to a reasonable level,. Normally, such bridges on railways or major highways are of single leaf construction, since they then behave as simply supported girders for carrying traffic loads. if a double leaf configuration is used, even the traffic loads are carried on cantilever structures which, in consequence, have to be of much stronger construction. Cantilever trusses were used during the early evolution of steel bridges. The table below summarises the factors which influence this choice.
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Building A Diy Rope Bridge
Factor Reasons Location of obstacles Pier positions are often dictated by rivers, railway tracks and buried services. To provide initial guidance in selection of bridge form and span. Perhaps the commonest form of service bridge is a simple light truss, although aesthetic considerations can rule this out in certain locations. This lecture continues the introduction to steel and composite bridges started in Lecture 1B. The main disadvantage of a moving bridge, of course, is the delay to traffic when a bridge is opened to shipping. further disadvantages include the need for manning and maintenance of the opening system, the risk of failure thus disrupting either shipping or surface traffic, and the risk of ships colliding with and damaging the structure. For long viaducts it is worthwhile to carry out initial costed designs for different spans to determine the most economical combination of superstructure and substructure costs. However, where an element of delay is acceptable, moving bridges are commonly used.
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Types of suspension bridges
Above this span fabricated sections will be required. Furthermore, it will be very weak in the transverse direction when subjected to wind loading. The main disadvantage of a lift bridge is that it can only give as much vertical clearance as is provided by the height of the towers. hence, if very large clearances are required, the towers become very expensive. As for bascule bridges, however, there is no need to raise the span fully for small vessels, thus improving the efficiency of operation.
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