橋梁工程本科畢業(yè)設(shè)計(jì)外文翻譯---混凝土橋梁的結(jié)構(gòu)形式-橋梁設(shè)計(jì)-展示頁
2025-05-26 13:38本頁面
【正文】 ,some states have adopted more refined designs ,such as the State of Washington standard girders. The specially designed precast girders may be used to carry a monorail transit system .The finished guide way of Walt Disney World Monorail features a series of segments, each consisting of six simply supported pretensioned beams ,together to from a continuous structure .Typical spans are 100 to 110 ft . Approximately half of the 337 beams used have some bination of vertical and horizontal curvatures and variable super elevation .All 2 beams are hollow, a feature achieved by inserting a styrofoam void in the curved beams and by a moving mandrel in straight beam production. Precast girders may not be used for spans much in excess of 120 ft because of the problems of transporting and erecting large, heavy units. On the other hand ,there is a clear trend toward the use of longer spans for bridges .For elevated urban expressways ,long spans facilitate access and minimize obstruction to activities below .Concern for environmental damage has led to the choice of long spans for continuous viaducts . For river crossings, intermediate piers may be impossible because of requirements of navigational clearance. In typical construction of this type, piers are castinplace, often using the slipforming technique .A ―hammerhead‖ section of box girder is often cast at the top of the pier, and construction proceeds in each direction by the balanced cantilever method. Finally, after the closing castinplace joint is made at midspan, the structure is further posttensioned for full continuity .Shear keys may be used on the vertical faces between segments, and precast are glued
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