外文翻譯---混凝土梁橋的結(jié)構(gòu)形式-wenkub
2023-05-19 09:11:03 本頁面
【正文】 ng ,design ,and construction requirements of the AASHTO Specification .Design requirements for pedestrian crossings and bridges serving other purposes may be established by local or regional codes and specifications .ACI Code provisions are often incorporated by reference . Bridges spans to about 100ft often consist of precast integraldeck units ,which offer low initial cost ,minimum ,maintenance ,and fast easy construction ,with minimum traffic interruption .Such girders are generally pretensioned .The units are placed side by side ,and are often posttensioned laterally at intermediate diaphragm locations ,after which shear keys between adjacent units are filled with nonshrinking mortar .For highway spans ,an asphalt wearing surface may be applied directly to the top of the precast concrete .In some cases ,a castinplace slab is placed to provide posite action . The voided slabs are monly available in depths from 15 to 21 in .and widths of 3 to 4 ft .For a standard highway HS20 loading, they are suitable for spans to about 50 ft, Standard channel sections are available in depths from 21 to 35 in a variety of widths, and are used for spans between about 20 and 60 ft .The hollow box beamsand singletee girders are intended for longer spans up to about 100 ft. For mediumspan highway bridges ,to about 120 ft ,AASHTO standard I beams are 4 generally used .They are intended for use with a posite castinplace roadway slab .Such girders often bine pretensioning of the precast member with posttensioning of the posite beam after the deck is placed .In an effort to obtain improved economy ,some stat
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