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基于相位差谱的非平稳地震波合成及应用

贾宏宇 蓝先林 陈航 郑史雄 李晰 张永水

贾宏宇, 蓝先林, 陈航, 郑史雄, 李晰, 张永水. 基于相位差谱的非平稳地震波合成及应用[J]. 西南交通大学学报, 2019, 54(3): 453-460. doi: 10.3969/j.issn.0258-2724.20180284
引用本文: 贾宏宇, 蓝先林, 陈航, 郑史雄, 李晰, 张永水. 基于相位差谱的非平稳地震波合成及应用[J]. 西南交通大学学报, 2019, 54(3): 453-460. doi: 10.3969/j.issn.0258-2724.20180284
JIA Hongyu, LAN Xianlin, CHEN Hang, ZHENG Shixiong, LI Xi, ZHANG Yongshui. Synthesis of Non-Stationary Seismic Waves Based on Phase Difference Spectrum and Its Application[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 453-460. doi: 10.3969/j.issn.0258-2724.20180284
Citation: JIA Hongyu, LAN Xianlin, CHEN Hang, ZHENG Shixiong, LI Xi, ZHANG Yongshui. Synthesis of Non-Stationary Seismic Waves Based on Phase Difference Spectrum and Its Application[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 453-460. doi: 10.3969/j.issn.0258-2724.20180284

基于相位差谱的非平稳地震波合成及应用

doi: 10.3969/j.issn.0258-2724.20180284
基金项目: 国家自然科学基金资助项目(51308465,E51508102);四川省科技厅计划资助项目(2019YJ0243);中国博士后基金(2015M580031);青海省科学技术厅应用基础资助项目(2016-ZJ-727)
详细信息
    作者简介:

    贾宏宇(1981—),男,副教授,博士,硕士生导师,研究方向为桥梁结构动力学,E-mail:Hongyu1016@swjtu.edu.cn

  • 中图分类号: TU311.3

Synthesis of Non-Stationary Seismic Waves Based on Phase Difference Spectrum and Its Application

  • 摘要: 为了模拟地震动的非平稳性和多维性并克服传统三角级数法在合成地震波中选择包络函数具有任意性和不能表征频率非平稳性的缺点,提出了基于相位差谱法的多维多点非平稳人工地震波合成. 首先,基于随机场理论模拟地震动的行波效应、相干效应、场地效应和多维性;其次,确定能表征地震动的强度非平稳和频率非平稳性的相位差谱;最后,将合成的非平稳地震波和当量反应谱应用到实际桥梁抗震分析中进行分析对比. 研究结果表明:相位差谱法合成多维多点非平稳地震动不需要包络函数控制地震波的波形,排除人工选择强度包络函数的任意性,且考虑了地震动的空间相关性和多维性,优于传统的三角级数法;本文方法与传统反应谱法计算结果基本一致,采用反应谱法计算的两处墩底的剪力值和弯矩值分别相差在10%和17%以内,本文方法分别在9%和12%以内.

     

  • 图 1  相位差谱均值趋势曲线

    Figure 1.  Mean curve trend chart of phase difference spectrum

    图 2  连续刚构桥示意(单位:m)

    Figure 2.  Schematic diagram of continuous rigid frame bridge (unit:m)

    图 3  x方向非平稳地震动(未修正)

    Figure 3.  Non-stationary ground motion at x direction(uncorrected)

    图 5  z方向非平稳地震动(未修正)

    Figure 5.  Non-stationary ground motion at z direction(uncorrected)

    图 6  拟合反应谱和设计反应谱(未修正)

    Figure 6.  Fitting response spectrum and design response spectrum(uncorrected)

    图 4  y方向非平稳地震动时程(未修正)

    Figure 4.  Non-stationary ground motion at y direction(uncorrected)

    图 7  x方向的非平稳人工地震时程(修正)

    Figure 7.  Non-stationary ground motion at x direction(corrected)

    图 8  拟合反应谱和目标设计反应谱(修正)

    Figure 8.  Non-stationary fitting response spectrum and target design response spectrum(corrected)

    图 9  连续刚构计算工况图例

    Figure 9.  Analysis case of continuous rigid frame bridge

    图 10  一致激励与多点激励的墩底剪力弯矩(相位差谱法)

    Figure 10.  Shearing and moment at the bottom of the piers under UE and ME(phase difference spectrum method)

    图 11  墩底处剪力

    Figure 11.  Shearing of the piers bottom

    图 12  墩底处弯矩

    Figure 12.  Moment of the piers bottom

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出版历程
  • 收稿日期:  2018-04-11
  • 修回日期:  2018-06-13
  • 网络出版日期:  2018-12-21
  • 刊出日期:  2019-06-01

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