考虑自复位影响的预应力节段拼装桥墩地震损伤模型
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1.南京理工大学 土木工程系;2.同济大学 土木工程防灾国家重点实验室;3.a

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江苏省自然科学基金面上项目(BK20211196);中央高校基本科研业务费专项资金资助项目(30920021154);江苏省研究生科研创新计划(KYCX21_0330)


Seismic Damage Model of Prestressed Segmental Bridge Columns Considering the Self-resetting Influence
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1.Department of Civil Engineering,Nanjing University of Science and Technology;2.State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University;3.a

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    摘要:

    预应力节段拼装桥墩在地震作用下具有良好的自复位能力,既有的损伤模型无法准确评估预应力节段桥墩的地震损伤。鉴于此,有必要研究预应力节段拼装桥墩的地震损伤模型。从预应力节段桥墩的自复位特点和损伤机理出发,对自复位性能表征方法进行简化,提出采用自复位修正因子来对桥墩在地震作用下的累积耗能进行修正,从而获得考虑桥墩自复位性能的地震损伤评估模型。在此基础上,划分预应力节段拼装桥墩的损伤状态,最后验证该地震损伤模型及损伤分级方法的适用性。结果表明:预应力节段桥墩的自复位性能与耗能损伤之间呈现明显的相关性,考虑桥墩自复位的地震损伤模型和分级方法适用于不同的预应力节段拼装桥墩,为定量评估预应力节段拼装桥墩在地震作用下的损伤程度打下基础。

    Abstract:

    Prestressed segmental bridge columns have good self-resetting capacity under earthquakes, but the existing damage models cannot accurately evaluate the damage of prestressed segmental bridge columns. Thus, it is necessary to study the seismic damage model of prestressed segmental bridge columns. Based on the self-resetting characteristics and damage mechanism of prestressed segmental bridge columns, the self-resetting performance characterization method is simplified. The self-resetting correction factor is proposed to correct the hysteretic energy dissipation of the bridge columns under earthquakes,then the seismic damage model considering the self-resetting performance of bridge columns is obtained. On this basis, the damage states of prestressed segmental bridge columns are divided. Finally, the applicability of the damage model and the damage classification method is verified. The results show that there is an obvious correlation between the self-resetting performance and the energy dissipation damage of prestressed segmental bridge columns. The seismic damage model and classification method considering columns self-resetting performance are suitable for different prestressed segmental bridge columns, which lays the foundation for quantitatively evaluating the damage degree of prestressed segment bridge columns under earthquakes.

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  • 收稿日期:2021-09-14
  • 最后修改日期:2021-12-29
  • 录用日期:2022-03-11
  • 在线发布日期: 2022-11-10
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