Editing Cable-stayed bridge (section)

==Designs==
There are four major classes of rigging on cable-stayed bridges: ''mono'', ''harp'', ''fan,'' and ''star''.<ref name=designs>{{cite web |url=http://www.eng-forum.com/articles/articles/cable_stayed.htm |title=Cable Stayed Bridge |website=Middle East Economic Engineering Forum |access-date=13 May 2016 |archive-url=https://web.archive.org/web/20190525145904/http://www.eng-forum.com/articles/articles/cable_stayed.htm |archive-date=25 May 2019 |url-status=dead }}</ref>

* The ''mono'' design uses a single cable from its towers and is one of the lesser-used examples of the class.
* In the ''harp'' or ''parallel'' design, the cables are nearly parallel so that the height of their attachment to the tower is proportional to the distance from the tower to their mounting on the deck.
* In the ''fan'' design, the cables all connect to or pass over the top of the towers. The fan design is structurally superior with a minimum moment applied to the towers, but, for practical reasons, the modified fan (also called the semi-fan) is preferred, especially where many cables are necessary. In the modified fan arrangement, the cables terminate near the top of the tower but are spaced from each other sufficiently to allow better termination, improved environmental protection, and good access to individual cables for maintenance.<ref>{{Cite web|url=http://ir.lib.uwo.ca/cgi/viewcontent.cgi?article=2246&context=etd|title=''Comparison Between Three Types of Cable Stayed Bridges Using Structural Optimization''|last=Sarhang Zadeh|first=Olfat|date=October 2012|website=Western University Canada|format=PDF}}</ref>
* In the ''star'' design, another relatively rare design, the cables are spaced apart on the tower, like the harp design, but connect to one point or a number of closely spaced points on the deck.<ref name="Dayaratnam2000">{{cite book|author1=T.K. Bandyopadhyay|author2=Alok Baishya|editor1=P. Dayaratnam|editor2=G.P. Garg|editor3=G.V. Ratnam|editor4=R.N. Raghavan|title=International Conference on Suspension, Cable Supported, and Cable Stayed Bridges: November 19–21, 1999, Hyderabad|url=https://books.google.com/books?id=pb67nkDk4FMC&pg=PA282|year=2000|publisher=Universities Press (India)|isbn=978-81-7371-271-5|pages=282, 373}}</ref>

<gallery class="center" mode="packed" caption="Difference between types of bridges" heights="60px">
File:Bridge-mono-cable-stayed.svg|''Mono'' design
File:Bridge-harp-cable-stayed.svg|''Harp'' design
File:Bridge-fan-cable-stayed.svg|''Fan'' design
File:Bridge-star-cable-stayed.svg|''Star'' design
</gallery>

[[File:Cable-stayed bridge tower arrangements.png|thumb|All the seven column arrangements of a cable-stayed bridge]]

There are also seven main arrangements for support columns: ''single'', ''double'', ''portal'', ''A-shaped'', ''H-shaped'', ''inverted Y'' and ''M-shaped''. The last three are hybrid arrangements that combine two arrangements into one.<ref name=designs/>

* The ''single'' arrangement uses a single column for cable support, normally projecting through the center of the deck, but in some cases located on one side or the other. Examples: [[Millau Viaduct]] in [[France]] and [[Sunshine Skyway Bridge]] in [[Florida]].
* The ''double'' arrangement places pairs of columns on both sides of the deck. Examples: [[Øresund Bridge]] between [[Denmark]] and [[Sweden]], and [[Zolotoy Bridge]] in [[Russia]].
* The ''portal'' is similar to the double arrangement but has a third member connecting the tops of the two columns to form a door-like shape or portal. This offers additional strength, especially against transverse loads. Examples: [[Hale Boggs Bridge]] in [[Louisiana]] and [[Kirumi Bridge]] in [[Tanzania]].
* The ''A-shaped'' design is similar in concept to the portal but achieves the same goal by angling the two columns towards each other to meet at the top, eliminating the need for the third member. Examples: [[Arthur Ravenel Jr. Bridge]] in [[South Carolina]], [[Helgeland Bridge]] in [[Norway]] and [[Christopher S. Bond Bridge (Kansas City, Missouri)|Christopher S. Bond Bridge]] in [[Missouri]].
* The ''H-shaped'' design combines the ''portal'' on the bottom with the ''double'' on top. Examples: [[Grenland Bridge]] in [[Norway]], [[Vasco da Gama Bridge]] in [[Portugal]], [[Greenville Bridge]] in [[Arkansas]] and [[John James Audubon Bridge (Mississippi River)|John James Audubon Bridge]] in Louisiana.
* The ''inverted Y'' design combines the ''A-shaped'' on the bottom with the ''single'' on top. Examples: [[Pont de Normandie]] in [[France]] and [[Incheon Bridge]] in [[South Korea]].
* The ''M-shaped'' design combines two ''A-shaped'', each tower on the side of the other, to form an M. This type of arrangement is rare, and is mostly used in wide bridges where a lonely ''A-shaped'' arrangement would be too weak. Examples: [[Fred Hartman Bridge]] in [[Texas]] and its planned sister bridge [[Ship Channel Bridge]], also in Texas.

Depending on the design, the columns may be vertical or angled or curved relative to the bridge deck.