贺金川¹，韩 峰^{2, 3}，郑山锁^{2, 3}，谢孝奎²，蔡永龙³
AuthorsHTML:贺金川¹，韩 峰^{2, 3}，郑山锁^{2, 3}，谢孝奎²，蔡永龙³
AuthorsListE:He Jinchuan¹，Han Feng ^{2, 3}，Zheng Shansuo ^{2, 3}，Xie Xiaokui²，Cai Yonglong³
AuthorsHTMLE:He Jinchuan¹，Han Feng ^{2, 3}，Zheng Shansuo ^{2, 3}，Xie Xiaokui²，Cai Yonglong³
Unit:1. 西安建筑科技大学建筑设计研究院，西安 710055；
2. 西安建筑科技大学土木工程学院，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. Architectural Design and Research Institute，Xi’an University of Architecture and Technology，Xi’an 710055，China；
2. School of Civil Engineering，Xi’an University of Architecture and Technology，Xi’an 710055，China；
3. Key Laboratory of Structural Engineering and Earthquake Resistance of Ministry of Education，Xi’an 710055，China
Abstract_Chinese:\r\r\r\r在酸性腐蚀土壤环境中，埋地钢管的抗震性能会随着服役龄期的延长而显著降低\r\r．为了研究酸性土壤环境中多龄期埋地钢管的抗震性能，对钢材进行人工加速腐蚀试验与拉伸破坏试验，建立了钢材屈服强度、极限强度、弹性模量及伸长率与失重率之间的关系；在全面腐蚀模型的基础上，揭示了酸性土壤环境中埋地钢管力学性能与几何尺寸随服役龄期的变化规律，并建立时变本构模型．基于\rANSYS\r有限元分析软件，建立了酸性土壤条件中考虑锈蚀钢材几何尺寸及力学性能退化的不同服役龄期有限元模型；采用增量动力分析法及云图法，建立了描述地震动强度与结构地震响应之间关系的概率地震需求模型，结合管道破坏状态的划分和概率意义上极限损伤限值的确定，对埋地钢管进行地震易损性分析，从而建立了考虑锈蚀耐久性能退化的不同服役龄期埋地钢管时变地震解析易损性模型，表征了管道单元损伤指标与地震动强度指标之间的关系\r\r，并进一步给出了不同管径多龄期埋地钢管的地震易损性曲线．\r结果表明：在酸性腐蚀土壤环境中，随着服役龄期的延长，埋地钢管的几何尺寸及力学性能均不断削减，出现不同震害状态的概率呈现不同幅度的升高；在其他条件相同的情况下，随着管径增大，出现不同震害状态的概率有一定程度的降低．\r\r\r\r
Abstract_English:In an acidic soil environment，the seismic performance of the buried steel pipes will obviously decrease with increasing service life. To study the seismic performance of the multi-age buried pipes in an acidic soil environment，the accelerated artificial corrosion test and the steel tensile failure test were performed. The relationships between yield strength，maximum strength，modulus of elasticity，elongation and weight loss rate were established. The variation laws of mechanical properties and size of steel pipes with increasing service life were obtained based on the general corrosion model，in order to establish the time-varying constitutive model. Based on the ANSYS finite element software，finite element models were established considering the deterioration of the geometric dimensions and mechanical properties of the corroded steel pipes under acidic soil conditions. Using the incremental dynamic analysis method and the cloud map method，a probabilistic model of seismic demand was established describing ground motion intensity parameters and structural demand parameters. Combined with the division of pipes damage states and the determination of the maximum damage value in the sense of probability，the seismic vulnerability analysis of buried steel pipes was performed，thus establishing the time-varying seismic analytical vulnerability models of buried steel pipes with different service ages，considering the degradation of corrosion durability. The relationship between the pipes damage index and the ground motion intensity index was characterized. In addition，the seismic vulnerability curve of buried multi-age steel pipes with different diameters was given. The results showed that，with the increasing age of service in acidic soil，the geometric dimensions and the mechanical properties of buried steel pipes were continuously reduced，and the probability of different states of damage caused by earthquakes increased in different amplitudes. Under the same conditions，with the increase in the diameter of the pipes，the probability of different states of damage from the earthquake was reduced to some extent.
Keyword_Chinese:埋地钢管；多龄期；酸性腐蚀；力学退化模型；地震易损性分析
Keywords_English:buried steel pipe；multi-age；acid rust；mechanical degradation model；seismic vulnerability analysis

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