Selection of Optimal Intensity Measures in Seismic Damage Analysis of Cable-Stayed Bridges Subjected to Far-Fault Ground Motions
Selection of Optimal Intensity Measures in Seismic Damage Analysis of Cable-Stayed Bridges Subjected to Far-Fault Ground Motions
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DOI：
10.1142/s1793431115500037
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发表时间：
2015-03
影响因子：
1.5
通讯作者：
Yuyi Zhang;Yong Ding;Y. Pang
中科院分区：
文献类型：
--
作者：
Yuyi Zhang;Yong Ding;Y. Pang
地震动的强度指标与桥梁结构的损伤密切相关。然而，工程师很难选择这些参数来预测斜拉桥在地震作用下的潜在破坏。本文研究了斜拉桥远断层地震动强度指标与桥梁损伤的相关性。选取322个远断层地震动，选取文献中26个可用的烈度指标，对一座独塔斜拉桥进行对比分析。建立了考虑混凝土刚度退化和钢筋低周疲劳效应的非线性有限元模型。结果表明，速度谱强度（VSI）是斜拉桥在远断层地震作用下地震损伤分析的最佳强度指标，其次是基频谱加速度和Housner烈度。5种常用的烈度指标，即峰值加速度（PGA）、PGA/PGV、比能量密度（SED）、卓越周期（Tp）和平均周期（Tm）与桥梁损伤的相关性较低。特别是，有很弱的相关性之间的常规使用的PGA和斜拉桥的地震损伤。
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 (Tp) and mean period (Tm), 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.