橋梁專(zhuān)業(yè)外文翻譯--歐洲橋梁研究(文件)
【正文】 al inspection, nondestructive radar testing and other exploratory methods were used to investigate for possible weaknesses in the bridge.Since the sudden collapse of YnysyGwas Bridge in Wales, UK in 1985, there has been concern about the longterm integrity of segmental, posttensioned concrete bridges which may be prone to ‘brittle’ failure without warning. The corrosion protection of the posttensioned steel cables, where they pass through joints between the segments, has been identified as a major factor affecting the longterm durability and consequent strength of this type of bridge. The identification of voids in grouted tendon ducts at vulnerable positions is recognized as an important step in the detection of such corrosion.Description of bridgeGeneral arrangementBesses o’ th’ Barn Bridge is a 160 m long, three span, segmental, posttensioned concrete railway bridge built in 1969. The main span of 90 m crosses over both the M62 motorway and A665 Bury to Prestwick Road. Minimum headroom is m from the A665 and the M62 is cleared by approx m.The superstructure consists of a central hollow trapezoidal concrete box section m high and 4 m wide. The majority of the south and central spans are constructed using m long precast concrete trapezoidal box units, posttensioned together. This box section supports the in site concrete transverse cantilever slabs at bottom flange level, which carry the rail tracks and ballast.The center and south span sections are of posttensioned construction. These posttensioned sections have five types of prestressing:1. Longitudinal tendons in grouted ducts within the top and bottom flanges.2. Longitudinal internal draped tendons located alongside the webs. These are deflected at internal diaphragm positions and are encased in in site concrete.3. Longitudinal macalloy bars in the transverse cantilever slabs in the
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