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Behavior of 48-Year-Old Double-Tee Bridge Girders Made with Lightweight Concrete

机译：轻质混凝土制成的48岁双T形桥梁的性能

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摘要

This paper describes the experimental testing of 48-year-old concrete bridge girders that were fabricated using lightweight concrete. After the bridge was decommissioned, three girders were transported to the Systems, Material, and Structural Health (SMASH) Laboratory at Utah State University (USU). The double-tee girders were tested to quantify the effective prestress, flexural capacity, and deck punching shear strength. The experimental results were compared with calculated values based on recommended procedures in the AASHTO LRFD bridge design specifications. The AASHTO refined method underestimated the loss of prestress of the three girders by an average of 17.6%. The calculated flexural capacities were overestimated by an average of 34.0% when compared with the measured values. This unconservative result is believed to be a result of the deck deterioration. The average calculated punching shear capacity was within 3.0% of the measured values. The experimental results were also compared with analytical values using computer software. These nonlinear finite-element analyses (FEAs) were found to replicate the behavior of the flexural and punching shear experiments in terms of both the failure mechanism and magnitude.
机译：本文介绍了使用轻质混凝土制造的48年历史的混凝土桥梁的试验测试。桥梁退役后，将三大梁运输到犹他州立大学（USU）的系统，材料和结构健康（SMASH）实验室。对双T形梁进行了测试，以量化有效的预应力，抗弯能力和桥面冲压抗剪强度。根据AASHTO LRFD桥梁设计规范中推荐的程序，将实验结果与计算值进行了比较。 AASHTO改进方法低估了三个大梁的预应力损失平均17.6％。与测量值相比，计算出的抗弯能力平均高估了34.0％。该不保守的结果被认为是甲板劣化的结果。计算出的平均冲切剪切能力在测量值的3.0％以内。还使用计算机软件将实验结果与分析值进行了比较。发现这些非线性有限元分析（FEA）可以从破坏机理和强度两方面复制挠曲和冲剪实验的行为。

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  • 来源
    《Journal of bridge engineering》 |2016年第9期|04016054.1-04016054.11|共11页
  • 作者

    Pettigrew Christopher S.; Barr Paul J.; Maguire Marc; Halling Marv W.;

  • 作者单位

    Utah State Univ, Dept Civil & Environm Engn, 4110 Old Main Hill, Logan, UT 84332 USA;

    Utah State Univ, Dept Civil & Environm Engn, 4110 Old Main Hill, Logan, UT 84332 USA;

    Utah State Univ, Dept Civil & Environm Engn, 4110 Old Main Hill, Logan, UT 84332 USA;

    Utah State Univ, Dept Civil & Environm Engn, 4110 Old Main Hill, Logan, UT 84332 USA;

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