Site effects based on time varying horizontal-to vertical spectral ratio

Vibroengineering PROCEDIA Pub Date : 2023-11-27 DOI:10.21595/vp.2023.23760

Fuchao Cao, Yinfeng Dong, Yiming Xie, Yiping Wang

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Abstract

Horizontal to vertical spectral ratio (HVSR) based on seismic ground motion is an important index to study site conditions and dynamic characteristics (seismic effect). Due to the influence of the vertical dynamic amplification effect of the site, the Fourier spectral ratio calculated according to the surface motion and downhole motion is quite different from that of the horizontal and vertical ground motion in the case of strong vibration input. However, our recent research shows that when considering the time-varying characteristics of ground motion, the time-varying surface-downhole spectral ratio and time-varying HVSR are almost the same. Based on this discovery, the time-varying HVSR is used to study the dynamic characteristics of the site (site effect). First, a new method for calculating the natural period and damping ratio of the site is proposed. Secondly, based on tremendous strong motion records, the prediction formulas of natural period and damping ratio are studied. Finally, the effects of various influencing factors on the natural period and damping ratio are compared. The results of this paper can provide a basis for selecting and synthesizing appropriate ground motions in structural seismic design.

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基于时间变化的水平-垂直光谱比的场地效应

基于地震地面运动的水平垂直谱比（HVSR）是研究场地条件和动力特性（地震效应）的重要指标。由于场地垂直动力放大效应的影响，在强振动输入的情况下，根据地面运动和井下运动计算的傅里叶谱比与水平和垂直地面运动计算的傅里叶谱比有很大差异。然而，我们最近的研究表明，当考虑到地表运动的时变特性时，时变地表-井下频谱比和时变 HVSR 几乎相同。基于这一发现，时变 HVSR 被用来研究场地的动力特性（场地效应）。首先，提出了计算场地自然周期和阻尼比的新方法。其次，基于大量的强震记录，研究了自然周期和阻尼比的预测公式。最后，比较了各种影响因素对自然周期和阻尼比的影响。本文的研究结果可为结构抗震设计中选择和综合适当的地面运动提供依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vibroengineering PROCEDIA

CiteScore

0.80

自引率

0.00%

发文量