【摘 要】
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Segmental concrete box-girder bridges are often realized by using a balanced cantilever approach where individual bridge segments are sequentially erected t
【机 构】
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DepartmentofCivilandEnvironmentalEngineering,PolitecnicodiMilano,Milan,Italy
【出 处】
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The 7th International Conference on Bridge Maintenance, Safe
论文部分内容阅读
Segmental concrete box-girder bridges are often realized by using a balanced cantilever approach where individual bridge segments are sequentially erected to form individual deck spans counterweighted about a single support (Mathivat 1983,AASHTO-PCIASBI 2002).The segments are kept in the cantilever arms together by means of post-tensioning of longitudinal prestressing tendons.During the erection stage the superstructure must be connected to the piers through suitable anchoring systems.Usually the superstructtre is made stable by using prestressing cables or prestressed bars which clamp the head deck segment to the top of the pier.This link must sustain the possible unbalances between the two cantilevers and may fail if the cables or the bars are too weak or if the unbalance becomes excessive.
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