Safety analysis of existing masonry arch bridges by nonlinear finite element simulations
Safety analysis of existing masonry arch bridges by nonlinear finite element simulations
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DOI：
10.1177/1056789519865995
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发表时间：
2020-01
影响因子：
4.2
通讯作者：
Stephanie A. Franck;N. Bretschneider;V. Slowik
中科院分区：
文献类型：
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作者：
Stephanie A. Franck;N. Bretschneider;V. Slowik
为了模拟圬工拱桥的特殊承载性能，可以进行非线性有限元分析。为此，本文提出了一种关联分析的概念。应用涂抹裂纹模型允许一个真实地再现在现有的这种类型的桥梁结构观察到的特征损伤模式。通过使用所提出的分析概念，可以揭示承载储备，并可以确定现有损坏的可能原因。该概念包括适当的失效准则和相应的安全裕度。后者大致符合有效的设计规范，但也考虑到非线性分析的具体情况。在参数研究中，分析结果的客观性和不同的材料参数对承载性能的影响。此外，还给出了两个既有浆砌石拱桥安全评估的实例。在这两种情况下，观察到的损坏模式可以在数值模拟中再现。在一座废弃桥梁上进行的破坏性荷载试验为验证所提出的分析概念提供了额外的机会。
In order to simulate the specific load-carrying behavior of masonry arch bridges, nonlinear finite element analyses may be carried out. To that end, an associated analysis concept is proposed in this paper. The applied smeared crack model allows one to realistically reproduce characteristic damage patterns observed at existing bridge structures of this type. By using the proposed analysis concept, load-bearing reserves may be revealed and possible causes for existing damage may be identified. The concept includes appropriate failure criteria and corresponding safety margins. The latter approximately conform to valid design codes, but also account for the specifics of nonlinear analyses. In parametric studies, the objectivity of the analysis results and influences of different material parameters on the load-bearing behavior were investigated. Furthermore, two examples of the safety evaluation of existing masonry arch bridges are presented. In both cases, observed damage patterns could be reproduced in the numerical simulations. Destructive load tests at a disused bridge provided an additional opportunity to validate the proposed analysis concept.