{"id":13827,"date":"2026-04-03T17:04:56","date_gmt":"2026-04-03T09:04:56","guid":{"rendered":"https:\/\/www.wedospace.com\/?p=13827"},"modified":"2026-04-03T17:17:42","modified_gmt":"2026-04-03T09:17:42","slug":"why-is-steel-used-for-bridges","status":"publish","type":"post","link":"https:\/\/www.wedospace.com\/ar\/why-is-steel-used-for-bridges\/","title":{"rendered":"\u0644\u0645\u0627\u0630\u0627 \u064a\u0633\u062a\u062e\u062f\u0645 \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0644\u0644\u062c\u0633\u0648\u0631"},"content":{"rendered":"
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Structural steel has an unparalleled strength-to-weight ratio, extremely high tensile strength and excellent ductility. It is currently the only truly viable material when dealing with long-span bridges that carry huge live loads while also resisting seismic forces. Unlike the field work of reinforced concrete, steel supports prefabrication in a controlled factory environment, which not only ensures the overall quality of the structure, but also makes the construction progress of the site much faster. Coupled with the maturity of weathering steel technology, the protective film formed on the surface can save a large amount of later maintenance costs. When dealing with complex engineering challenges, steel is chosen because it finds the optimal solution in terms of cost performance, durability and design flexibility.<\/p>\n\n\n\n

\"steel<\/figure>\n\n\n\n

<\/span>Mechanical Properties<\/span><\/h2>\n\n\n\n

The first is the strength-to-weight ratio. Steel has light weight but great \u201cstrength\u201d, which means that we can design the upper structure to be lighter. This is very critical in the actual project, because the upper part is light, the following piers and foundations do not need to be so large, the material consumption and foundation costs of the whole project are directly reduced.<\/p>\n\n\n\n

The second is tensile strength. Bridges-especially suspension bridges and cable-stayed bridges-are under tension all the time. Under such conditions, concrete often appears to be weak, while steel can be stretched without breaking under great tension, which is why we can build those slender, elegant long-span bridges.<\/p>\n\n\n\n

Another thing that is particularly important in seismic zones is ductility. I have always felt that ductility is the \u201clife-saving attribute\u201d of steel bridges \u201c. Steel can produce a lot of deformation before it completely fails, which means that when an earthquake occurs, the bridge can dissipate energy by shaking and deforming, rather than having that devastating brittle fracture.<\/p>\n\n\n\n

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