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首页> 外文期刊>Journal of earthquake and tsunami >Selection of Optimal Intensity Measures in Seismic Damage Analysis of Cable-Stayed Bridges Subjected to Far-Fault Ground Motions
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Selection of Optimal Intensity Measures in Seismic Damage Analysis of Cable-Stayed Bridges Subjected to Far-Fault Ground Motions

机译：斜拉地震作用下斜拉桥地震损伤分析中最佳强度措施的选择

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摘要

The intensity measures of ground motions are closely related to the damage of bridge structures. However, it is difficult for engineers to select these parameters to predict the potential damage of cable-stayed bridges under earthquakes. This paper investigated the correlation between the intensity measures of far-fault ground motions and the damage of cable-stayed bridges. 322 far-fault ground motions were selected, and 26 available intensity measures in the literatures were chosen to carry out comparative analysis on a cable-stayed bridge with a single pylon. The nonlinear finite element model of this bridge was built, considering the stiffness degradation of concrete and low-cycle fatigue effect of steel. It is concluded in this study that velocity spectral intensity (VSI) is the optimal intensity measure for seismic damage analysis of cable-stayed bridges subjected to far-fault ground motions, followed by spectral acceleration at fundamental period and Housner intensity. Five commonly used intensity measures, namely peak ground acceleration (PGA), the ratio of PGA to peak ground velocity (PGA/PGV), specific energy density (SED), predominant period (T-p) and mean period (T-m), demonstrate low correlations with the bridge damage. In particular, there is very weak correlation between the conventionally used PGA and the seismic damage of cable-stayed bridges.
机译：地震动的强度测量与桥梁结构的破坏密切相关。但是，工程师很难选择这些参数来预测地震作用下斜拉桥的潜在损坏。本文研究了远距离地震动的强度测度与斜拉桥的损伤之间的相关性。选择了322个远断层地面运动，并选择了26种文献中可用的强度测量方法，以对单塔斜拉桥进行比较分析。考虑混凝土的刚度退化和钢的低周疲劳效应，建立了该桥的非线性有限元模型。得出的结论是，速度谱强度（VSI）是用于斜拉桥在远断层地震动下进行地震损伤分析的最佳强度度量，然后是基本周期的频谱加速度和侯斯纳强度。五种常用的强度度量，即峰值地面加速度（PGA），峰值峰值速度与峰值地面速度的比（PGA / PGV），比能量密度（SED），主要周期（Tp）和平均周期（Tm），显示出较低的相关性与桥梁损坏。尤其是，传统使用的PGA与斜拉桥的地震破坏之间的关联非常弱。

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