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Flexural properties of a lightweight hybrid FRP-aluminum modular space truss bridge system

机译：轻巧的混合FRP-铝模块化空间桁架桥系统的抗弯性能

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摘要

A hybrid FRP-aluminum space truss structure system was designed as a modular emergency bridge with a span of 12 m. The bridge has a light weight of only approximately 1.2 tons and contains 8 structural units, which are composed of an aluminum bridge deck supported by FRP trussed members and connected by male jugs and female jaws based on the pre-tightened teeth connection (PTTC) technique. In the paper, the conceptual design of the bridge, assembly of structural units and bridge erection are described in detail. To understand the actual flexural behavior of the bridge, 4 prototype structural units were fabricated and mounted as a single-span simply supported structure and subjected to the four-point bending loading test. Structural computational models, including two FE models and a simplified analytical planar model, were constructed and validated by the experimental results. The results indicated that (1) the specimen displayed linear behavior under the ultimate-limit-state loading level, and both the strength and stiffness satisfied the design requirements; (2) the bridge deck exhibited an unexpected complex strain distribution, which is different from that of the analogous structure; and (3) the "beam-grillage" FE model and simplified analytical planar model provided effective calculation methods for the proposed bridge.
机译：混合FRP-铝空间桁架结构系统被设计为跨距为12 m的模块化应急桥梁。这座桥的重量仅为1.2吨，包含8个结构单元，这些结构单元由铝制桥面板组成，铝桥面板由FRP桁架支撑，并根据预紧齿连接（PTTC）技术通过公壶和母钳口连接。在本文中，详细描述了桥梁的概念设计，结构单元的组装和桥梁的架设。为了了解桥梁的实际挠曲性能，制造了4个原型结构单元，并将其安装为单跨简单支撑结构，并进行了四点弯曲载荷测试。实验结果构建并验证了结构计算模型，包括两个有限元模型和一个简化的分析平面模型。结果表明：（1）试样在极限极限荷载水平下表现出线性行为，强度和刚度均满足设计要求。 （2）桥面板表现出意想不到的复杂应变分布，这与类似结构不同。 （3）“梁-固结”有限元模型和简化的分析平面模型为拟建桥梁提供了有效的计算方法。

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  • 来源
    《Composite Structures》 |2014年第2期|600-615|共16页
  • 作者

    Dongdong Zhang; Qilin Zhao; Yaxin Huang; Fei Li; Haosen Chen; Dasheng Miao;

  • 作者单位

    College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China;

    College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China;

    College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China;

    Institute of Logistics Engineering of PLA, Chongqing 400000, China;

    College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China;

    College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Space truss bridge; FRP; Pre-tightened teeth connection (PTTC); Experimentation; Finite element analysis (FEA);

    机译：太空桁架桥;玻璃钢;预紧齿连接（PTTC）;实验;有限元分析（FEA）;

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