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Stochastic Dynamic Analysis of Bridges Subjected to Spatially Varying Ground Motions.

机译：受地震动变化影响的桥梁随机动力学分析。

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摘要

Using response spectrum and time-history analysis methods, a thorough investigation of the response of bridges subjected to spatially varying support motions is performed. Three main causes of spatial variability are considered: the incoherence effect, which represents random differences in the amplitudes and phases of seismic waves due to reflections and refractions that occur during wave propagation in the heterogeneous medium of the ground and due to differential superposition of waves arriving from different parts of an extended source; the wave-passage effect, which describes the differences in the arrival times of waves at separate locations; and the site-response effect, which accounts for differences in the intensities and frequency contents of surface motions due to variable soil profiles underneath the supports.;The multiple-support response spectrum (MSRS) method originally developed by Der Kiureghian and Neuenhofer (1992) is generalized to allow consideration of response quantities that depend on the support degrees of freedom, and extended to account for quasi-static contributions of truncated modes. Efficient algorithms and a computer code are developed for the implementation of the generalized and extended MSRS method. The code is used for comprehensive parametric analyses of four real bridge models with vastly different characteristics. The analyses identify cases of ground motion spatial variability and types of bridges for which the effects of spatial variability are significant.;Methods for simulation of spatially varying ground motion arrays incorporating the effects of incoherence, wave passage and differential site response are developed. The simulated motions inherit statistical characteristics of a specified acceleration record at a reference site. The conditional simulation approach preserves time-history characteristics of the specified record; however, the array of motions exhibits increasing variability with distance from the reference site. The unconditional simulation method generates an array of motions that preserve the overall temporal and spectral characteristics of the specified record and exhibit uniform variability at all locations. The simulated motions are validated by examining their physical compliance and by comparing their response spectra, coherency characteristics and power spectral densities with corresponding target models.;Sets of simulated support motions are used to investigate the effect of spatial variability on linear and non-linear bridge response by time-history analyses. Comparisons between linear and non-linear pier drifts are performed to assess the accuracy of the "equal displacement" rule (Veletsos and Newmark, 1960) for spatially varying ground motions. Comparisons between mean peak responses obtained from linear time-history and MSRS analyses provide information on the range of errors induced by the approximations involved in the latter method.;Finally, coherency analysis of a recorded array of near-fault ground motions is performed. The ability of commonly used models to describe the incoherence component of this array is assessed.
机译：使用响应频谱和时程分析方法，对桥梁在空间上变化的支撑运动的响应进行了全面研究。考虑了空间变化的三个主要原因：不相干效应，它表示地震波在振幅和相位上的随机差异，这是由于在地面非均质介质中的波传播过程中发生的反射和折射以及到达的波的差分叠加引起的。来自扩展源的不同部分；波通过效应，描述了波在不同位置到达的时间差异；以及场地响应效应，这解释了由于支撑物下方土壤变化引起的地表运动强度和频率含量的差异。； Der Kiureghian和Neuenhofer（1992）最初开发的多支撑响应光谱（MSRS）方法。通用化可以考虑依赖于支持自由度的响应量，并扩展为考虑截断模式的准静态贡献。开发了有效的算法和计算机代码来实现广义和扩展的MSRS方法。该代码用于对具有完全不同特征的四个真实桥梁模型进行全面的参数分析。分析确定了地面运动空间变异的情况和对空间变异性影响显着的桥梁类型。；开发了结合不连贯性，波通过和差分场响应效应的空间变化地面运动阵列的仿真方法。模拟的运动继承了参考位置上指定加速度记录的统计特性。条件模拟方法保留了指定记录的时程特性；然而，运动阵列显示出随着距参考部位距离的增加而增加的可变性。无条件模拟方法生成一系列运动，这些运动保留指定记录的整体时间和频谱特征，并在所有位置均表现出均匀的可变性。通过检查其物理顺应性并将其响应谱，相干特性和功率谱密度与相应的目标模型进行比较，来验证模拟运动。；使用一组模拟支撑运动来研究空间可变性对线性和非线性桥梁的影响通过时间历史分析做出回应。进行线性和非线性墩台位移之间的比较，以评估针对空间变​​化的地面运动的“等位移”规则（Veletsos和Newmark，1960年）的准确性。从线性时间历史和MSRS分析获得的平均峰值响应之间的比较提供了有关后一种方法所涉及的近似值引起的误差范围的信息。最后，对记录的近断层地震动阵列进行了相干分析。评估了常用模型描述此阵列的非相干成分的能力。

著录项

  • 作者

    Konakli, Aikaterini.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 264 p.
  • 总页数 264
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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