Full-scale fatigue simulation of the deterioration mechanism of reinforced concrete road bridge slabs under dry and wet conditions
Full-scale fatigue simulation of the deterioration mechanism of reinforced concrete road bridge slabs under dry and wet conditions
复制标题
干湿条件下钢筋混凝土公路桥板劣化机理的全尺寸疲劳模拟
DOI：
10.1016/j.engstruct.2021.112988
复制
发表时间：
2021
影响因子：
5.5
通讯作者：
S. Tsuchiya
中科院分区：
文献类型：
--
作者：
Jie Fang;T. Ishida;E. Fathalla;S. Tsuchiya
本研究探讨公路桥梁钢筋混凝土板在乾燥与积水（湿）条件下之劣化过程与机制。以往的研究使用简单板模型（SPM）来预测钢筋混凝土桥面的疲劳寿命，考虑保守的假设，在不同的环境过程下进行更安全的评估。为了获得更详细的分析，阐明劣化的结果和机制，在本研究中使用了一个真实的桥梁的足尺上部结构。模拟结果显示，由于尺寸效应和边界条件的差异，全尺寸模型（FSM）和SPM之间。研究结果还表明，在FSM模拟的故障机制不同的干燥和潮湿的条件。在干燥的情况下，桥面板的底面容易发生损坏。然而，在潮湿的情况下，水平裂缝和解体发生在顶部表面下方靠近上部钢筋层的板在早期阶段在很短的时间内，这不能目视调查，根据目前的桥梁板检查规定。这些结果成功地再现了现场发生的劣化现象，表明了模拟的可信性。然后研究了两轮荷载作用下钢筋混凝土板的连续性。该研究为公路桥梁钢筋混凝土板的合理设计和养护提供了有益的参考。
This study investigates the deterioration process and mechanism of reinforced concrete (RC) slabs in road bridges under dry and stagnant water (wet) conditions. Previous studies used a simple-plate model (SPM) to predict the fatigue life of RC decks by considering conservative assumptions for safer assessment under different environmental processes. To obtain a more detailed analysis and clarify the deterioration result and mechanism, a full-scale superstructure of a realistic bridge is used in this study. The simulation results reveal differences between the full-scale model (FSM) and SPM due to size effects and boundary conditions. The findings also demonstrate that the failure mechanism in the FSM simulations differs between dry and wet conditions. In dry cases, damage easily occurs at the bottom surface of the bridge slab. However, in wet cases, horizontal cracks and disintegration occur below the top surface near the upper rebar layer of the slab during the early stage over a very short time period, which cannot be visually investigated according to current bridge slab inspection regulations. These results successfully reproduce the deterioration phenomenon that occurred on site, which indicates the credibility of the simulation. Then the effect of two wheel-loading on RC slabs is studied to assess the slab continuity at adjacent panels. This study provides a useful reference for more rational design and maintenance of RC slabs of road bridges.
影响因子：
2
作者：
K. Maekawa;K. El-kashif
通讯作者：
K. Maekawa;K. El-kashif
移动式滚轮式载荷作用下 RC 板的三维疲劳模拟，
DOI：
--
发表时间：
2006
期刊：
Journal of Advanced Concrete Technology 4(3)
影响因子：
--
作者：
Maekawa;K.;Gebreyouhannes;E.;Mishima;T.;An;X.
通讯作者：
X.