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首页> 外文学位 >IMPEDANCE MATRICES AND INTERPOLATION TECHNIQUES FOR 3-D INTERACTION ANALYSIS BY THE FLEXIBLE VOLUME METHOD.
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IMPEDANCE MATRICES AND INTERPOLATION TECHNIQUES FOR 3-D INTERACTION ANALYSIS BY THE FLEXIBLE VOLUME METHOD.

机译：弹性体积法进行3D相互作用分析的阻抗矩阵和插值技术。

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Most currently available procedures for the dynamic analysis of three dimensional soil-structure systems have some restrictions regarding the type of system that can be analysed. Hence, a new technique, the flexible volume method, has been developed. This method can handle much more complex problems than current methods of analysis. It can handle flexible foundations of arbitrary shapes embedded in a layered viscoelastic halfspace, structure to structure interaction, and pile foundations. The only limitation being cost and available computer storage space.;The method proposed differs from other substructuring techniques in the manner in which the soil and the structure are partitioned. By assuming that the interaction occurs at all the nodes connecting the structure to the foundation, the general three dimensional impedance problem is reduced to a series of axisymmetric solutions of the response of a layered site to point loads. A perfect halfspace can be modeled by the addition of special energy absorbing boundaries at the base of the model.;The method works in the frequency domain using the complex response method. Transient problems can be handled by Fast Fourier Transform techniques. In order to make the method cost-effective, a new interpolation scheme is proposed. This scheme significantly reduces the number of frequencies where the response of the system (complex transfer functions) need to be computed.;The method has been implemented in a system of computer programs called SASSI. Several solutions obtained by this program show good agreement with known analytical solutions. This favorable comparison provides verification for both the method and the SASSI computer code.;SASSI was also used to study the structural response of the Humboldt Bay Nuclear Power Plant during the Ferndale Earthquake of June 7, 1975. The response obtained from SASSI was compared with actual recordings made at the plant and with the response obtained from a plane strain analysis using FLUSH. From this investigation it was shown that for heavy, stiff embedded structures, soil-structure interaction effects are very important. Furthermore, the response in the foundation obtained from a FLUSH analysis can be accurate enough for engineering purposes.
机译：对于三维土壤结构系统的动力学分析，当前最有效的方法对于可分析的系统类型有一些限制。因此，已经开发了一种新技术，即弹性容积法。与当前的分析方法相比，该方法可以处理更为复杂的问题。它可以处理嵌入分层粘弹性半空间中的任意形状的柔性基础，结构与结构之间的相互作用以及桩基础。唯一的限制是成本和可用的计算机存储空间。所提出的方法与其他子构造技术的不同之处在于对土壤和结构进行分区的方式。通过假设相互作用发生在将结构连接到基础的所有节点上，一般的三维阻抗问题可以简化为一系列分层响应点荷载的轴对称解。可以通过在模型的基础上添加特殊的能量吸收边界来建模理想的半空间。;该方法使用复响应方法在频域中工作。瞬态问题可以通过快速傅立叶变换技术来处理。为了使该方法具有成本效益，提出了一种新的插值方案。该方案显着减少了需要计算系统响应（复杂传递函数）的频率。该方法已在称为SASSI的计算机程序系统中实现。通过该程序获得的几种解决方案与已知的分析解决方案具有很好的一致性。这一有利的比较为方法和SASSI计算机代码提供了验证。SASSI还被用于研究1975年6月7日费尔代尔地震期间洪堡湾核电站的结构响应。在工厂进行的实际记录，以及使用FLUSH进行平面应变分析获得的响应。从这项调查中可以看出，对于沉重，刚性的嵌入式结构，土-结构相互作用的影响非常重要。此外，从FLUSH分析中获得的地基响应对于工程目的可能足够准确。

著录项

  • 作者

    TAJIRIAN, FREDERICK FARAJ.;

  • 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 1981
  • 页码 169 p.
  • 总页数 169
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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