工程力学 ›› 2019, Vol. 36 ›› Issue (3): 121-130.doi: 10.6052/j.issn.1000-4750.2017.12.0941

• 土木工程学科 • 上一篇    下一篇

主余震序列作用下非线性单自由度体系的增量损伤分析

于晓辉1,2,3, 乔雨蒙2,3, 代旷宇2,3, 陶静2,3, 吕大刚2,3   

  1. 1. 中国地震局工程力学研究所, 中国地震局地震工程与工程振动重点实验室, 哈尔滨 150090;
    2. 哈尔滨工业大学, 结构工程灾变与控制教育部重点实验室, 哈尔滨 150090;
    3. 哈尔滨工业大学, 土木工程学院智能防灾减灾工业与信息化部重点实验室, 哈尔滨 150090
  • 收稿日期:2017-12-12 修回日期:2018-08-31 出版日期:2019-03-29 发布日期:2019-03-16
  • 通讯作者: 吕大刚(1970-),男,黑龙江人,教授,博士,博导,副院长,从事抗震可靠性、易损性和鲁棒性研究(E-mail:ludagang@sina.com). E-mail:ludagang@sina.com
  • 作者简介:于晓辉(1982-),男,辽宁人,副研究员,博士,从事地震易损性和概率风险分析的研究(E-mail:yxhhit@126.com);乔雨蒙(1989-),男,河南驻马店人,博士生,从事主余震序列作用下结构抗震性能评估方面的研究(E-mail:ymqiao@hit.edu.cn);代旷宇(1991-):男,河南驻马店人,博士生,从事结构地震风险分析方面的研究(E-mail:daikuangyu@126.com);陶静(1992-),女,河南南阳人,硕士,从事主余震序列作用下结构非线性反应方面的研究(E-mail:1185357633@qq.com)
  • 基金资助:
    中国地震局工程力学研究所基本科研业务费专项资助项目(2018D08);国家自然科学基金项目(51408155,51378162,51778198);国家建设高水平大学公派研究生项目(201606120187)

INCREMENTAL DAMAGE ANALYSIS OF NONLINEAR SINGLE-DEGREE-FREEDOM SYSTEMS SUBJECTED TO MAINSHOCK-AFTERSHOCK EARTHQUAKE SEQUENCES

YU Xiao-hui1,2,3, QIAO Yu-meng2,3, DAI Kuang-yu2,3, TAO Jing2,3, LU Da-gang2,3   

  1. 1. Institute of Engineering Mechanics, China Earthquake Administration, Key Laboratory of Earthquake Engineering and Engineering Vibration, China Earthquake Administration, Harbin 150090, China;
    2. Key Lab of Structure Dynamic Behavior and Control of China Ministry of Education, Harbin Institute of Technology, Harbin 150090, China;
    3. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disaster of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China
  • Received:2017-12-12 Revised:2018-08-31 Online:2019-03-29 Published:2019-03-16

摘要: 同时采用真实主余震序列和人工构造主余震序列作为输入,开展了非线性单自由度体系在主余震序列作用下的增量损伤分析。挑选75组真实主余震序列,并基于相同的主震记录,分别采用重复法、随机法和衰减法构造不同的人工主余震序列作为输入。分别采用理想弹塑性模型、考虑屈服后刚度的双线型模型和三线型模型,开展主余震序列作用下非线性单自由度体系的反应分析。以修正的Park-Ang损伤指数作为结构损伤指标,对主余震序列作用下的结构增量损伤进行研究,并对强度折减系数、恢复力模型及主余震序列人工构造方法对增量损伤的影响进行研究。结果表明:余震造成的结构增量损伤不可忽视。基于重复法和随机法合成的人工主余震序列相比真实主余震序列的余震强度偏大,因此会高估余震对结构造成的增量损伤。基于衰减法合成的人工主余震序列的余震强度偏小,会低估余震对结构造成的增量损伤。结构特性对增量损伤的影响很小,体现为不同强度折减系数及不同恢复力模型对结构增量损伤的影响均不明显。

关键词: 主余震序列, 增量损伤, 单自由度体系, 重复法, 随机法, 衰减法

Abstract: The incremental damage of nonlinear single-degree-of-freedom (SDOF) systems subjected to real and artificial mainshock-aftershock (MA) sequences is evaluated. A suite of 75 real mainshock-aftershock sequences is selected. Based on the same mainshock records, different methods including the repeated method, the randomized method and the attenuated method are also adopted to generate artificial MA sequences as earthquake inputs. The nonlinear responses of the SDOF systems due to earthquake sequences are calculated considering different hysteretic models, including the elastic-plastic model, the bilinear model considering the post-yielding hardening, and the trilinear model. The modified Park-Ang damage index is used as a structural damage index, and the structural cumulative damages and the incremental damages due to MA sequences are examined by considering the effects of different strength reduction factors, different hysteretic models and different MA sequences. The results show that the aftershock-induced incremental damages of structures cannot be neglected. The aftershock records from the artificial MA sequences generated by the repeated method and the randomized method have stronger intensities than that from the real MA sequences. This may cause the overestimation of the incremental damage of structures due to aftershock. However, the intensities of the aftershock records for the artificial MA sequences generated by the attenuated method are smaller than that of the real MA sequences, which may lead to an underestimation of the incremental damage of structures due to aftershock. The characteristics of structural systems have ignorable effects on aftershock-induced incremental damage since the effects of strength reduction factors and hysteretic models on the incremental damage of structures are not significant.

Key words: mainshock-aftershock sequences, incremental damages, SDOF systems, repeated method, randomized method, attenuated method

中图分类号: 

  • TU311.3
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