谢孝奎¹，贺金川²，郑山锁^{1, 3}，韩峰^{1, 3}，蔡永龙³
AuthorsHTML:谢孝奎¹，贺金川²，郑山锁^{1, 3}，韩峰^{1, 3}，蔡永龙³
AuthorsListE:Xie Xiaokui¹，He Jinchuan²，Zheng Shansuo^{1, 3}，Han Feng^{1, 3}，Cai Yonglong³
AuthorsHTMLE:Xie Xiaokui¹，He Jinchuan²，Zheng Shansuo^{1, 3}，Han Feng^{1, 3}，Cai Yonglong³
Unit:1. 西安建筑科技大学土木工程学院，西安 710055；
2. 西安建筑科技大学建筑设计研究院，西安 710055；
3. 结构工程与抗震教育部重点实验室，西安 710055
Unit_EngLish:1. School of Civil Engineering，Xi’an University of Architecture and Technology，Xi’an 710055，China；
2. Architectural Design and Research Institute，Xi’an University of Architecture and Technology，Xi’an 710055，China；
3. Key Laboratory of Structural Engineering and Earthquake Resistance of Ministry of Education of China，Xi’an 710055，China
Abstract_Chinese:在碱性及近中性土壤环境中，埋地钢管随着服役龄期的延长腐蚀逐渐加深，其力学与抗震性能不断退化．为了研究碱性及近中性土壤环境中多龄期埋地钢管的抗震性能，引入钢材时变本构模型，对埋地钢管进行了增量动力时程分析，建立了碱性及近中性土壤环境中不同服役龄期埋地钢管的概率地震需求模型．基于管线三态破坏准则，确定了各极限破坏状态的限值，进而建立了碱性和近中性土壤环境中4种不同服役龄期埋地钢管单元时变地震解析易损性模型，并绘制出相应的时变地震易损性曲线．结合震害资料的经验统计规律，对3种不同管径的多龄期埋地钢管进行了地震易损性分析．结果表明：在碱性及近中性土壤环境中，随着服役龄期的延长及管径的减小，相同地震动作用下埋地钢管在基本完好、中等破坏、严重破坏等极限破坏状态下的超越概率均逐渐增大．
Abstract_English:In alkaline and near-neutral soil environments，the mechanical and seismic performance of buried steel pipes degrades with deepening corrosion over time．To study the seismic fragility of buried steel pipes of different service ages in these environments，an incremental dynamic time history analysis of typical pipes was carried out with the time-varying constitutive model of steel．A probabilistic seismic demand model for buried steel pipes of different service ages in alkaline and near-neutral soil environments was then established，which can characterize the probability relationship between the ground motion intensity and structural response．Furthermore，on the basis of the tristate criteria，the limits of each ultimate failure state were determined．Time-varying seismic analytical fragility models of the pipes，including pipe units in two different soil environments and four service ages，were then established，which can characterize the probability of different failure states of structures under different earthquakes．The corresponding seismic fragility curves were then drawn．Seismic fragility curves were also obtained within three different diameter ranges based on seismic damage statistics．Results showed that，under the same ground motion，with increasing service time and decreasing pipe diameter，the probabilities of three failure states，namely，basically intact，moderately damaged，and severely damaged，all increased．
Keyword_Chinese:碱性土壤；近中性土壤；埋地钢管；力学性能退化；多龄期；地震易损性
Keywords_English:alkaline soil；near-neutral soil；buried steel pipe；degeneration of mechanical property；multiage；seismic fragility

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