• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Transportation Research Record >Fiber-Reinforced Polymer Shear Strengthening of Short-Span, Precast Channel Beams in Bridge Superstructures
【24h】

Fiber-Reinforced Polymer Shear Strengthening of Short-Span, Precast Channel Beams in Bridge Superstructures

机译：桥梁上部结构中短跨预制通道梁的纤维增强聚合物抗剪加固

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A national study concluded that at least 14 states use precast channel beams for their bridge superstructures. Before the mid-1970s short-span (19-ft) precast channel beam bridges were designed by the Arkansas State Highway and Transportation Department for H15 loading without any provision for shear reinforcement. A recent statewide survey has identified 389 of these bridges that remain in service. About 3% are load posted. Approximately one-third of the 389 bridges are exhibiting deterioration that may be serious. During a recent investigation by the University of Arkansas, 33 precast channel beams were evaluated for structural strength. It was determined that many of these units have inadequate shear capacity. A shear crack frequency distribution curve was developed through examination of the 33 tested beams. A simple shear strengthening technique is presented consisting of fiber-reinforced polymer (FRP) strips as external stirrups. The technique has been developed so that it can be easily implemented in the field. The FRP strips are spaced to prevent the full formation of a diagonal crack between two adjacent strips and designed to ensure a flexural failure rather than a sudden shear failure. Four beams retrofitted with the proposed retrofit technique and two control beams were load tested to failure to evaluate the effectiveness of the technique. Results from the experiment show that the retrofitted beams exhibited at least a 290% increase in deflection ductility and a 418% increase in energy ductility.
机译：一项全国性研究得出的结论是，至少有14个州在其桥梁上部结构中使用预制通道梁。在1970年代中期之前，阿肯色州州公路和运输部设计了短跨度（19英尺）的预制通道梁桥，用于H15荷载，但没有提供抗剪加固措施。最近一项全州范围的调查确定了其中389座仍在使用的桥梁。约有3％被发布。 389座桥中约有三分之一的车削可能会很严重。在阿肯色大学最近的调查中，评估了33个预制通道梁的结构强度。已确定这些单元中有许多单元的剪切能力不足。通过检查33根测试梁，得出了一条剪切裂纹频率分布曲线。提出了一种简单的剪切增强技术，该技术由纤维增强聚合物（FRP）条作为外部箍筋组成。已经开发了该技术，以便可以在现场轻松实现该技术。 FRP条带间隔开以防止在两个相邻条带之间完全形成对角裂纹，并设计为确保弯曲破坏而不是突然的剪切破坏。用提议的改造技术改造的四根梁和两根控制梁进行了载荷测试，以评估该技术的有效性。实验结果表明，改型后的梁的挠性延展性至少增加了290％，能量延展性增加了418％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号