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Splice system in extending the precast prestressed concrete beam span

机译:延长预制预应力混凝土梁跨度的拼接系统

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摘要

This project focuses on the use of splicing precast concrete beams to extend their span length. Precast prestressed concrete beams are economical solutions for many bridges, due to various restrictions such as weight and hauling length they are rarely used for spans greater than 40 m. This project was initiated by collecting the information from internet and technical reports of some bridge projects that have used spliced beam system. The experimental work has been carried out on three beams of 2.5 m span with different location of splice loaded to fail. The type of splice beam system used consisted of precast pretensioned beam joint together by post-tensioned method. The experimental results show the development at shear failures inclined the depth opposed with initial prediction to fail in flexure. Both spliced beam has achieved the ultimate load capacity. On the other hand, the actual load capacity for controlled beam was twice times higher than calculated. From this research, base on ultimate load failure, the spliced system applied for double spliced beam has succeeded to perform as calculated nominal beam. However, since the actual controlled beam perform better, and the splice beam fail unexpectedly in shear, the future research should focusing on the materials, location and type of splice section to improve the present research.
机译:该项目的重点是使用拼接预制混凝土梁来延长其跨度。预制预应力混凝土梁是许多桥梁的经济解决方案,由于重量和牵引长度等各种限制,它们很少用于跨度大于40 m的桥梁。该项目是通过收集来自互联网的信息以及一些使用拼接梁系统的桥梁项目的技术报告而发起的。实验工作是在跨度为2.5 m的三根梁上进行的,其中不同位置的接头加载失败。所使用的拼接梁系统的类型包括通过预张紧方法将预张紧的预应力梁连接在一起。实验结果表明,剪切破坏的发展与初始预测相反,其倾斜深度与弯曲破坏相反。两种拼接梁都达到了极限承载能力。另一方面,受控梁的实际负载能力是计算值的两倍。从这项研究中,基于极限载荷失效,应用于双拼接梁的拼接系统已经成功地完成了计算的标称梁的工作。但是,由于实际的控制梁性能更好,并且拼接梁在剪切过程中出乎意料地失效,因此,未来的研究应该集中在拼接部分的材料,位置和类型上,以改进本研究。

著录项

  • 作者

    Kamarol Zaki Mohd. Nasir;

  • 作者单位
  • 年度 2009
  • 总页数
  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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