Truss bridgesA truss is a triangula

Truss bridges
A truss is a triangulated framework of elements that act primarily in tension and compression. It is a light-weight yet very stiff form of construction. Truss girders were common in early steel bridge construction as welding had yet to be developed (pre 1930s), and rolled sections and plate sizes were of a limited range.

They are considered expensive to fabricate today, being labour intensive, and maintenance issues have to be carefully addressed, e.g. ease of access. However, they can still show dvantages in particular applications such as footbridges and railway bridges. Typical spans in one form or other can range from 40m to 500m.

Trusses may be used as girders below the deck level, or as through girders with the deck at the bottom chord level. Such through-truss girders minimise the effective construction depth, and the length of approach embankments. Hence, they are particularly suited to footbridges and railway bridges. The light-weight, yet stiff, nature of truss bridges also makes them ideal for demountable "Bailey" bridges.

Trusses can also be used as arch elements, examples of these are the Sydney Harbour Bridge, and as cantilever elements, the Forth Rail Bridge in Scotland, a further example of this is the Brinnington rail bridge in Manchester. They also have applications as stiffening girders on major suspension bridges.Brinnington rail bridge, Manchester, UK
 

The Yeonjong Bridge in Korea is clearly a suspension bridge, but it is a classic example of how a truss is used as the main deck stiffening girder. However, in this example the stiffening girder is also subjected to large compressive forces as it this bridge the world’s longest self-anchored suspension bridge.Yeonjong bridge, Korea

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Truss kreteg
A truss iki framework triangulated unsur sing tumindak utamané ing tension lan komprèsi. Iku cahya bobot durung wangun banget kuli saka construction. Balok-balok Truss padha umum ing construction Bridge baja awal minangka welding wis durung dikembangaké (wis taun 1930-an), lan mbalek bagean lan ukuran piring padha saka sawetara winates. Lagi dianggep larang kanggo fabricate dina iki, kang pegawe intensif, lan masalah pangopènan kudu kasebut kanthi teliti, ono, contone gampilipun aksès. Nanging, padha isih bisa nuduhake dvantages ing aplikasi tartamtu kayata footbridges lan railway kreteg. Kedaden khas ing salah siji wangun utawa liyane bisa Range saka 40m 500m. Trusses bisa dipigunakaké minangka balok-balok ngisor tingkat kelompok, utawa liwat balok-balok karo kelompok ing tingkat penghubung ngisor. Kuwi liwat-truss balok-balok nyilikake ambane construction efektif, lan dawane pendekatan embankments. Empu, iku utamané cocog kanggo footbridges lan railway kreteg. Lampu-bobot, durung kuli, alam truss kreteg uga ndadekake wong becik kanggo demountable "Bailey" kreteg. Trusses uga bisa digunakake minangka unsur arch, conto iki Sydney Harbour Bridge, lan minangka unsur cantilever, ing Rail Bridge kasebut ing Romania, contone luwih saka iki jembatan ril Brinnington di Manchester. Padha uga duwe aplikasi minangka stiffening balok-balok ing Bridge bridges.Brinnington penundaan alur utama, Manchester, UK Ing Yeonjong Bridge in Korea iku cetha suspension bridge, nanging menika tuladha klasik saka carane truss digunakake minangka kelompok utama stiffening dibangun. Nanging, ing tuladha iki dibangun stiffening uga subjected pasukan Compressive gedhe minangka jembatan paling dawa iki poto-anchored donya penundaan bridge.Yeonjong jembatan, Korea