Evaluation of Fatigue Damage in RC Slabs Considering Water Infiltration by Means of 3D AE and Elastic Wave Tomography
Evaluation of Fatigue Damage in RC Slabs Considering Water Infiltration by Means of 3D AE and Elastic Wave Tomography
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利用 3D AE 和弹性波断层扫描评估考虑水渗透的 RC 板疲劳损伤
DOI：
10.1007/978-981-15-9837-1_27
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
T. Maeshima
中科院分区：
文献类型：
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作者：
H. Asaue;T. Shiotani;S. Fukumoto;T. Maeshima
为合理维护土木工程基础设施，应在出现明显损坏/劣化之前实施适当的维护计划。对于公路桥梁的钢筋混凝土板，应研究其疲劳损伤演化过程，以制定合理的维修方案。作者对钢筋混凝土板的疲劳破坏机理进行了深入的研究，但考虑渗水的影响，其内部疲劳损伤过程尚待进一步阐明。为了解混凝土桥面板在水渗透作用下的疲劳破坏机理，对表面充水的混凝土板进行了系统的车轮加载试验。通过几个负载步骤和在每个指定循环之后进行车轮负载的多次重复，在100、200和250 k循环中，对试样施加静载荷，并监测AE活动。利用声发射活动即声发射源定位，实现三维声发射层析成像，利用弹性波速度分布（层析图像）识别损伤。根据各加载阶段的断层图像，讨论了考虑入渗的破坏机理，并与不考虑入渗的情况进行了比较。通过研究，揭示了与干燥条件下不同的、由初始裂纹扩展而成的非常独特的破坏过程。
To maintain civil engineering infrastructures reasonably, proper maintenance programs shall be implemented before remarkable damage/deterioration. As for RC slabs of road bridges, an evolutional process of fatigue damage shall be studied to establish the proper maintenance program. The authors have enthusiastically studied the mechanism of fatigue failure of the RC slabs; however, there is still space to clarify internal fatigue damage progress in consideration of water infiltration. In the study, to know the fatigue failure mechanism of RC decks in consideration of water infiltration, a wheel loading test of the RC slab filled with water on the surface is conducted systematically. Numerous numbers of repetition of the wheel load are conducted by several loads’ step and after each designated cycle e.g., 100, 200 and 250 k cycles, the specimen is subject to static load with monitoring AE activity. With using AE activity namely AE sources located, 3D AE tomography is implemented to identify the damage with elastic wave velocity distributions (tomogram). Based on the tomograms obtained each loads’ step, failure mechanisms in consideration of water infiltration is discussed in comparison with the cases without infiltration. Through the study, very unique failure progress, being different from dry condition, which expands from first-introduced cracks comes to light.