外文翻譯---預(yù)應(yīng)力混凝土-其他專業(yè)(編輯修改稿)
2025-02-24 09:47 本頁面
【文章內(nèi)容簡介】 long span members helps to reduce the shear forces developed at the support section. A prestressed concrete flexural member is stiffer under working loads than a reinforced concrete member of the same depth. However, after the onset of cracking, the flexural behavior of a prestressed member is similar to that of a reinforced concrete member. The use of high strength concrete and steel in prestressed members results in lighter and slender members than could be possible by using reinforced concrete. the two structural features of prestressed concrete ,namely high strength concrete and freedom from cracks , contributes to the improved durability of the structure under aggressive environmental conditions .Prestressing of concrete improves the ability of the material for energy absorption under impact loads. The ability to resist repeated working loads has been proved to be as good in reinforced concrete. The economy of prestressed concrete is well established for long span structures. According to Dean , standardlized precast bridge beams between 10 and 30 m long and precast prestressed piles have proved to be economical than steel and reinforced concrete is economical for floor , roofs and bridges of spans up to 30 and for cast in suit work , it applies to spans up to 100 m. in the long span range , prestressed concrete is generally economical in parison with reinforced concrete and steel construction. Prestressed concrete has considerable resilience due it its capacity recovering from substantial effect of overloading without undergoing
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