Fatigue Life Assessment of Integral Concrete Bridges with H Cross-Section Steel Piles Mounted in Water
Fatigue Life Assessment of Integral Concrete Bridges with H Cross-Section Steel Piles Mounted in Water
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DOI：
10.1007/s11668-020-00976-w
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发表时间：
2020-08-11
影响因子：
1.2
通讯作者：
Kashyzadeh, K. Reza
中科院分区：
文献类型：
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作者：
Abdollahnia, H.;Elizei, M. H. Alizadeh;Kashyzadeh, K. Reza
本研究的主要目的是预测H型截面钢桩的疲劳寿命的整体混凝土桥梁，是安装在海上。为实现这一目的，利用CATIA软件对该桥进行了几何模型设计，该桥长90 m，包括42根钢桩。其次，进行了两种不同的应力分析，包括静态分析（为了研究静水的影响）和瞬态动力分析（为了研究海浪碰撞的影响），以提取桩顶部的总变形。有限元分析结果表明，静水对桥桩的受力性能无明显影响。但海浪与桩的碰撞使桩变形。最后，采用有限元模拟和概率分析两种不同的方法，对H形截面钢桩在海浪作用下的疲劳寿命进行了预测。结果表明，静水对整体式混凝土桥梁各部位不产生疲劳损伤。此外，通过有限元分析和概率分析发现，钢桩在波浪冲击变幅荷载作用下的使用寿命分别为39年和34年。
The main aim of the present research is to predict the fatigue life of H cross-section steel piles of an integral concrete bridge that is mounted in the sea. To achieve this purpose, the geometric model of the bridge with a 90 m length including 42 numbers of steel piles was designed using CATIA software. Next, two different stress analyses including static analysis (in order to study the effect of motionless water) and transient dynamic analysis (in order to study the effect of sea waves clash) were performed for extracting the total deformation on the top part of the piles. The finite element results indicated that motionless water has no significant effect on the mechanical behavior of the bridge piles. But the sea waves clash with the piles caused a deformation on the piles. Eventually, the fatigue life of the H cross-section steel pile subjected to the sea waves clash was predicted using two different techniques (finite element simulation and probabilistic approach). The results reveal that the motionless water has no ability to cause fatigue damage to the different parts of an integral concrete bridge. Moreover, it is found that the useful lifetime of steel piles under variable amplitude loading caused by sea waves clash is 39 and 34 years based on the FE and probabilistic analyses, respectively.