考虑自复位影响的预应力节段拼装桥墩地震损伤模型  

Seismic damage model of prestressed segmental bridge piers considering the self-centering influence

作　　者：张于晔[1] 乔宁 蒋定之 袁万城[2] ZHANG Yuye;QIAO Ning;JIANG Dingzhi;YUAN Wancheng(Department of Civil Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]南京理工大学土木工程系,江苏南京210094 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《地震工程学报》2023年第2期287-295,共9页China Earthquake Engineering Journal

基　　金：国家重点研发计划项目(2019YFE0112300);江苏省自然科学基金项目(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)。

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,而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。Prestressed segmental bridge piers have a good self-centering capacity under earthquakes.However,existing damage models cannot accurately evaluate the seismic damage of such piers.Thus,studying the seismic damage model of prestressed segmental bridge piers is crucial.Based on the self-centering characteristics and damage mechanisms of prestressed segmental bridge piers,the self-centering performance characterization method was first simplified in this study.Then,the self-centering correction factor was used to correct the hysteretic energy dissipation of bridge piers under an earthquake,and a seismic damage model was obtained,taking into account the self-centering performance of bridge piers.On this basis,the damage states of the prestressed segmental bridge piers were divided,and the applicability of the damage model and the damage classification method was verified.Results revealed that an obvious correlation existed between the self-centering performance and the energy dissipation damage of prestressed segmental bridge piers.The proposed model and classification method considering the self-centering performance of piers are suitable for different prestressed segmental bridge piers.This study can lay the foundation for quantitatively evaluating the damage degree of prestressed segment bridge piers under earthquakes.

关 键 词：预应力节段拼装桥墩 地震损伤 评估模型 自复位修正因子 损伤分级 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]