Table of Contents
How does a Extradosed bridge work?
The extradosed/cable-stayed bridge uses a series of cable-supported spans to cross the river with equal span lengths of approximately 300 feet, as shown in Figure 6.7. The superstructure would be supported by cables above the deck anchored at one end to a central pylon and at the other end to the edge of the deck.
What do you mean by Extradosed bridge?
An extradosed bridge employs a structure that combines the main elements of both a prestressed box girder bridge and a cable-stayed bridge.
How does a cable-stayed bridge work?
cable-stayed bridge, bridge form in which the weight of the deck is supported by a number of nearly straight diagonal cables in tension running directly to one or more vertical towers. The towers transfer the cable forces to the foundations through vertical compression.
What is bridge construction?
A bridge is a structure which is built over some physical obstacle such as a body of water, valley, or road, and its purpose is to provide crossing over that obstacle. It is built to be strong enough to safely support its own weight as well as the weight of anything that should pass over it.
How is a suspension bridge built?
In the case of suspension bridges, towers are built atop the caissons. The early suspension-bridge towers were stone, but now they are either steel or concrete. Next, the anchorages are built on both ends, usually of reinforced concrete with embedded steel eyebars to which the cables will be fastened.
What is cantilever construction method?
The balance cantilever method is method of construction where the segment is need to construct from pier. Balance cantilever method are suitable for long span bridge especially for crossing wide river and minimize construction site at ground level.
What is cantilever building?
In building, any beam built into a wall and with the free end projecting forms a cantilever. Longer cantilevers are incorporated in a building when clear space is required below, with the cantilevers carrying a gallery, roof, canopy, runway for an overhead travelling crane, or part of a building above.
What are the characteristics of extradosed bridge?
Design characteristics. Visually, extradosed bridges typically have the appearance of a cable-stayed bridge with very short towers (pylons), with cable stays of shallow angle that may not extend along the full length of the deck, and (frequently) with a more substantial deck superstructure.
What is a stay cable on an extradosed bridge?
As a result of these characteristics, the “stay cables” on extradosed bridges are not treated as such by the design codes, but are instead considered as external post-tensioning tendons that have been deviated upwards from the deck to the towers to increase the superstructure’s load capacity over the main supports. : 1 Extradosed bridges frequen…
When was the first extradosed bridge made?
The earliest bridge known to incorporate some of the features of an extradosed design is Bridge in Rzuchów near Leżajsk, constructed in Poland in 1980.
What is an extradosal bridge?
The extradosal bridge form is mostly suited to medium-length spans between 100 metres (330 ft) and 250 metres (820 ft), and over fifty such bridges had been constructed around the world to 2012.