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首页> 外文期刊>Bulletin of earthquake engineering >Time-dependent seismic demand and fragility of deteriorating bridges for their residual service life
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Time-dependent seismic demand and fragility of deteriorating bridges for their residual service life

机译：随时间变化的地震需求和不断恶化的桥梁的剩余使用寿命的脆弱性

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Coastal bridges that are exposed to marine environments always suffer serious corrosion, which degrades their structural performance during the long-term service period. This paper investigates the time-dependent seismic demand and fragility of coastal bridges for their residual service life. First, the equal exceeding probability method was established to consider the reduction in the seismic hazard level for the residual service life of the structures. A finite element model of sound and aging structures was built by analyzing the different corrosion characteristics of bridge columns in the atmospheric zone, splash and tidal zone and submerged zone due to chloride penetration in concrete. The incremental dynamic analysis method was adopted to analyze the seismic demand and establish the fragility curves of the sound and aging bridges under both the design spectral acceleration and the reduced earthquake inputs for comparison. The results of this analysis indicate that the seismic demand of the structure significantly decreases, and the probability of failure of the structural system does not support the common opinion of increasing in the residual service period, if the shortening of the service period is considered in the analysis.
机译：暴露在海洋环境中的沿海桥梁经常遭受严重腐蚀，这在长期使用期间会降低其结构性能。本文研究了随时间变化的地震需求和沿海桥梁的剩余使用寿命的脆弱性。首先，建立了均等超概率方法，以考虑结构剩余使用寿命的地震危险等级降低。通过分析混凝土中氯化物渗透引起的大气，飞溅，潮汐带和淹没区桥梁柱的不同腐蚀特征，建立了合理的老化结构有限元模型。采用增量动力分析方法对地震需求进行分析，并在设计频谱加速度和地震输入减少的情况下，建立了声音和老化桥梁的脆性曲线进行比较。分析结果表明，如果考虑缩短服务期，则结构的地震需求将显着降低，并且结构系统的失效概率不支持增加剩余服务期的普遍观点。分析。

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