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Seismic Performance of Precast Prestressed Concrete Bridge Girders Using Field-Cast Ultrahigh-Performance Concrete Connections

机译:现场浇铸超高性能混凝土连接的预制预应力混凝土桥梁梁的抗震性能

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摘要

Precast concrete bridges have many advantages over cast-in-place construction. Prefabrication typically requires less time at the site due to the ease of installation. Furthermore, production in a controlled environment can result in higher bridge quality. However, the quality of field connections is a key challenge in ensuring the integrity of the bridge seismic performance. A Federal Highway Administration (FHWA) research project conducted at the University at Buffalo in 2012 using ultrahigh-performance concrete (UHPC) to evaluate the suitability of deck-level connections between precast prestressed concrete bridge girders is reported in this paper. The structural performance of the UHPC connections has been investigated by both cyclic and static loading tests at the FHWA Turner-Fairbank Highway Research Center. This paper discusses the results of a shake table study on the seismic performance of two full-scale prestressed girders connected with UHPC. The main objective of this experimental study was to observe the seismic performances of the UHPC connection between two bridge girders to assess the applicability of using UHPC-connected precast bridge girders in moderate to high earthquake regions. The experimental results show that the use of a UHPC connection with straight rebar protruding from the prestressed girders provided adequate resilience even under high-level earthquake ground motions.
机译:预制混凝土桥梁比现浇建筑具有许多优势。由于易于安装,预制通常在现场需要较少的时间。此外,在受控环境中进行生产可以提高桥梁质量。但是,现场连接的质量是确保桥梁抗震性能完整性的关键挑战。本文报道了2012年在布法罗大学进行的一项联邦公路管理局(FHWA)研究项目,该项目使用超高性能混凝土(UHPC)来评估预制预应力混凝土桥梁大梁之间桥面连接的适用性。 UHPC连接的结构性能已通过FHWA特纳-费尔班克高速公路研究中心的循环和静态载荷测试进行了研究。本文讨论了用振动台研究两个与UHPC连接的全尺寸预应力大梁的抗震性能的结果。该实验研究的主要目的是观察两座桥梁之间的UHPC连接的抗震性能,以评估在中到高地震地区使用UHPC连接的预制桥梁的适用性。实验结果表明,即使在高水平地震地震动下,使用带有从预应力梁伸出的直钢筋的UHPC连接也能提供足够的弹性。

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  • 来源
    《Journal of bridge engineering》 |2019年第6期|04019046.1-04019046.15|共15页
  • 作者单位

    FHWA Turner Fairbank Highway Res Ctr, Genex Syst, 6300 Georgetown Pike, Mclean, VA 22101 USA;

    SUNY Buffalo, Dept Civil Struct & Environm Engn, Buffalo, NY 14260 USA;

    FHWA Turner Fairbank Highway Res Ctr, Genex Syst, 6300 Georgetown Pike, Mclean, VA 22101 USA;

    SUNY Buffalo, Dept Civil Struct & Environm Engn, Buffalo, NY 14260 USA;

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