Full-scale experimental and numerical investigation on the ductility, plastic redistribution, and redundancy of deteriorated concrete bridges

Wang Xiaoming; Mao Xiangyuan; Frangopol Dan M.; Dong You; Wang Huan; Tao Pei; Qi Zezhong; Tang Shengpeng

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Full-scale experimental and numerical investigation on the ductility, plastic redistribution, and redundancy of deteriorated concrete bridges

机译：延展性，塑料再分配和劣化混凝土桥梁延展性，塑料再分配和冗余的全规模实验性和数值研究

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Due to structural degradation, the performance of concrete bridges may degrade with time and result in catastrophic consequences. A novel approach is developed for evaluating the time-variant reliability of multi-girder concrete bridges considering the effects of the load-carrying mechanism and redundancy. By considering three failure modes at both the component and system levels, a new performance indicator is proposed for quantitatively evaluating the load elastic distribution and plastic redistribution among multiple girders. The adverse effects of material deterioration on the structural capacity, ductility, redundancy, load-carrying capacity, and failure mechanism are also investigated and incorporated into the analytical procedure, in which an incremental nonlinear finite element analysis of a 3D fiber beam element is used. Furthermore, the results associated with full-scale destructive tests of two in situ deteriorated bridges, a reinforced concrete (RC) and a prestressed RC (PRC) T-girder bridge, are adopted to evaluate the accuracy of the proposed approach. The feasibility and satisfactory performance of the proposed framework are evaluated using these two real-world bridges. The results demonstrate that the load-carrying mechanism and redundancy significantly affect the structural ultimate load-carrying capacity and time-variant reliability of deteriorating structures.

机译：由于结构性降解，混凝土桥的性能可能随着时间的推移而降低并导致灾难性后果。考虑载荷机构和冗余的效果，开发了一种用于评估多梁混凝土桥的时变可靠性的新方法。通过考虑两个组件和系统级别的故障模式，提出了一种新的性能指示器，用于定量评估多个梁之间的负载弹性分布和塑性再分配。还研究了材料劣化对结构容量，延展性，冗余，承载能力和故障机制的不利影响，并结合到分析过程中，其中使用了3D光束元件的增量非线性有限元分析。此外，采用与两个原位劣化桥，钢筋混凝土（RC）和预应力的RC（PRC）T梁桥的全规模破坏性试验相关的结果，以评估所提出的方法的准确性。使用这两个现实世界桥接评估所提出的框架的可行性和满意性能。结果表明，承载机构和冗余显着影响劣化结构的结构终极承载能力和时变可靠性。

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来源
《Engineering Structures》 |2021年第1期|111930.1-111930.15|共15页
作者
Wang Xiaoming; Mao Xiangyuan; Frangopol Dan M.; Dong You; Wang Huan; Tao Pei; Qi Zezhong; Tang Shengpeng;
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作者单位

Changan Univ Key Lab Transport Ind Bridge Detect Reinforcement Xian 710064 Shaanxi Peoples R China;

Changan Univ Key Lab Transport Ind Bridge Detect Reinforcement Xian 710064 Shaanxi Peoples R China;

Lehigh Univ ATLSS Engn Res Ctr Dept Civil & Environm Engn 117 ATLSS Dr Bethlehem PA 18015 USA;

Hong Kong Polytech Univ Dept Civil & Environm Engn Hong Kong Peoples R China;

Sichuan Highway Planning Survey Design & Res Inst Chengdu 610041 Sichuan Peoples R China;

Changan Univ Key Lab Transport Ind Bridge Detect Reinforcement Xian 710064 Shaanxi Peoples R China;

Changan Univ Key Lab Transport Ind Bridge Detect Reinforcement Xian 710064 Shaanxi Peoples R China;

Changan Univ Key Lab Transport Ind Bridge Detect Reinforcement Xian 710064 Shaanxi Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Multi-girder bridge; Load-carrying mechanism; Ductility; Plastic redistribution; Time-variant system reliability and redundancy;

机译：多梁桥;承载机构;延展性;塑料再分配;时变量系统可靠性和冗余;

Full-scale experimental and numerical investigation on the ductility, plastic redistribution, and redundancy of deteriorated concrete bridges

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