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New polymer coat wears well

机译：新型聚合物外套磨损良好

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The Poplar Street bridge across the Mississippi River in St. Louis, Mo., is an orthotropic steel-plate deck bridge. It carries three major interstate highways, I-70, I-64 and I-55, across the Mississippi River at St. Louis. Approximately 130,000 vehicles including about 15,000 large trucks use the bridge each day. The five-span bridge is 2,165 ft long and consists of two independent bridges supported on a set of common piers. Each bridge carries four lanes of traffic and is supported by two box girder with girder depths ranging from 16 ft to 25 ft. The deck-plate thickness is typically 9/16 in. and is stiffened by closed trapezoidal stringers or ribs. The 5/16-in.-thick stiffeners on 13-in. centers are 11 in. deep and run along the length of the bridge. Load from the deck also is transferred to the box girders by transverse floor beams coinciding with every fourth floor beam location, providing the bridge additional torsional rigidity. There are approximately 30 such orthotropic steel-plate bridges in the world including six in the U.S.
机译：位于密苏里州圣路易斯的密西西比河上的白杨街大桥是正交异性钢板桥。它横跨圣路易斯的密西西比河，拥有三大州际公路，即I-70，I-64和I-55。每天大约有130,000辆车，包括大约15,000辆大型卡车使用该桥。五跨桥长2165英尺，由两个独立的桥组成，并支撑在一组公共墩上。每座桥梁载有四条行车线，由两座箱梁支撑，箱梁深度为16英尺至25英尺。盖板的厚度通常为9/16英寸，并通过封闭的梯形纵梁或肋骨进行加固。 13英寸上5/16英寸厚的加劲肋。中心深11英寸，沿桥的长度方向延伸。来自楼板的载荷也通过与每个第四楼板梁位置重合的横向楼板梁传递到箱形梁，从而为桥梁提供了额外的扭转刚度。世界上大约有30座这样的正交异性钢板桥，其中美国有6座。

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