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首页> 外文期刊>Transportation Research Record >Fatigue Behavior of Prestressed Tubular Bridge Deck of Fiber-Reinforced Polymer
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Fatigue Behavior of Prestressed Tubular Bridge Deck of Fiber-Reinforced Polymer

机译：纤维增强聚合物预应力管桥桥面的疲劳行为

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An experimental study was undertaken to assess the flexural fatigue performance of a new deck system of fiber-reinforced polymer (FRP) that has been installed on a bridge in Delaware County, Ohio. The deck consists of a series of 4-in. (102-mm) square pultruded FRP tubes with a thickness of 1/4 in. (6.4 mm), laid side by side on existing stringers, perpendicular to the direction of traffic. The tubes are posttensioned up to 20 kips (90 kN) with 0.6-in. (15-mm) diameter seven-wire strands at midpoints between the stringers in the direction of traffic. Four double-span FRP deck specimens with two different tube sizes and three different span lengths were tested in flexural fatigue under AASHTO-prescribed footprint of wheel loads for an HS20 truck. Panel action in the deck system was inadequate for the most part, as only the tubes that were directly under the load carried the majority of the load. Subsequent slippage between these tubes and their adjacent tubes can cause cracking in the asphalt overlay. However, no such crack has been observed on the actual bridge after 1 year in service. Panel action is generally improved at higher prestress levels. Prestressing also offers additional redundancy and reserve strength for the system. While longer span decks fail in bending, shorter span decks generally suffer from local shear failure as a result of stress concentrations at the corner of the tubes under the applied load or at the support. The fatigue problem is less critical for longer span decks and smaller tube sizes.
机译：进行了一项实验研究，以评估已安装在俄亥俄州特拉华县一座桥梁上的新型纤维增强聚合物（FRP）甲板系统的弯曲疲劳性能。甲板包括一系列的4英寸。 （102毫米）方形拉挤FRP管，厚度为1/4英寸（6.4毫米），并排放置在现有纵梁上，垂直于交通方向。在0.6英寸的压力下，将管后张至20 kips（90 kN）。 （15毫米）直径的七线绞线在纵梁之间沿行进方向的中点。在AASHTO规定的HS20卡车轮辋占地面积下，对四个具有两种不同管径和三种不同跨度长度的双跨FRP甲板样品进行了弯曲疲劳测试。甲板系统中的面板作用在大多数情况下是不充分的，因为只有直接在负载下的管道才承担大部分负载。这些管及其相邻管之间的后续打滑会导致沥青覆盖层破裂。但是，在使用了1年之后，在实际的桥梁上没有观察到这种裂缝。在较高的预应力水平下，面板动作通常会得到改善。预应力还为系统提供了额外的冗余并保留了强度。虽然较长的跨度桥面无法弯曲，但较短的跨度桥面通常会由于施加的载荷或支撑处的管角处的应力集中而遭受局部剪切破坏。对于较长跨度的甲板和较小的管子尺寸，疲劳问题的重要性较小。

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