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Amplification of linear strain in a layer excited by a shear-wave earthquake pulse

机译：剪切波地震脉冲激发的层中线性应变的放大

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摘要

Peaks of transient strains in a layer over semi-infinite half space are amplified by interference during up- and down-propagating waves, and they depend upon the impedance ratio of the layer and of the half space, as well as the wavelength. The amplification of incident motion on the ground surface is usually described in the frequency space for the response to a steady state, periodic excitation. To understand how this amplification develops for transient responses and for applications in which the linear theory leads to satisfactory answers, this paper describes the amplification in time in a layer excited by a shear-wave pulse. It is shown that the maximum amplification is equal to 2 for a "stiff layer on a "soft" half space, and equal to 4 for a "soft" layer on a "stiff1 half space, when the layer thickness corresponds to the quarter wavelength of the wave in the layer.
机译：在半无限半空间上方的层中，瞬态应变的峰值会在向上和向下传播的波中受到干扰而放大，并且它们取决于该层与半空间的阻抗比以及波长。通常在频率空间中描述对地面的入射运动的放大，以响应稳态的周期性激励。为了了解这种放大如何针对瞬态响应以及线性理论导致令人满意的应用的发展，本文介绍了在剪切波脉冲激发的层中随时间的放大。结果表明，当层厚对应于四分之一波长时，“软”半空间上的“硬层”的最大放大率等于2，而“软1”半空间上的“软”层的最大放大率等于4。层中的波浪。

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  • 来源
    《Soil Dynamics and Earthquake Engineering》 |2010年第10期|P.1073-1081|共9页
  • 作者

    V. Gicev; M.D. Trifunac;

  • 作者单位

    Fakultet za informatika University Coce Delcev 2000 Stip Republic of Macedonia;

    Department of Civil Engineering University of Southern California Los Angeles CA 90089 USA;

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