通过全尺寸加速试验了解桥面性能

Mehdi Rashidi, Hoda Azari, J. Braley, R. Zobel
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引用次数: 0

摘要

了解桥梁的长期性能在选择适当的资产管理策略方面起着重要作用,从而最终降低生命周期成本并延长桥梁的使用寿命。为了更好地了解桥梁性能,美国联邦公路管理局启动了一项研究项目,利用全尺寸桥梁上部结构系统在循环移动车轮载荷和冻融环境条件下的加速测试。作为研究项目的一部分,采用互补无损评估(NDE)技术来评估全尺寸桥面在养护和加载期间的性能。施工后不久的无损检测结果显示,甲板中部的钢筋覆盖深度较小。这很可能为随后的桥牌退化创造了一条优先路径。建议使用比例版本的电阻率(ER)值来提高甲板瞬时ER测量值之间的一致性,并表明将施工信息与无损检测结果相结合可以改善结果的解释。总体而言,结果表明NDE对新建筑质量保证的重要性,并提供了对桥面长期性能的更好理解。
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Understanding the performance of bridge decks through full-scale accelerated testing
Understanding the long-term performance of bridges plays a major role in the selection of appropriate asset management strategies, which eventually reduce life-cycle costs and extend the service life of a bridge. To better understand bridge performance, the Federal Highway Administration initiated a research project utilizing accelerated testing of full-scale bridge superstructure systems subjected to cyclic moving wheel loads and freeze-thaw environmental conditions. As a part of the research project, complementary nondestructive evaluation (NDE) techniques were used to assess the performance of a full-scale bridge deck during the curing and loading period. NDE results, shortly after construction, revealed a smaller cover depth of rebars in the middle section of the deck. This has likely created a preferential path for the subsequent deterioration of the deck. It was suggested to use a scaled version of the electrical resistivity (ER) values to improve the consistency between temporal ER measurements of the deck, and it was shown that combining construction information with NDE results can improve the interpretation of results. Overall, results showed the importance of NDE for quality assurance of new construction and provided a better understating of the long-term bridge deck performance.
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CiteScore
1.70
自引率
0.00%
发文量
28
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