摘要
借助有限差分法确定考虑多重环境因素影响的钢骨混凝土桥墩内置钢材初始锈蚀时间,基于海蚀环境中纵筋截面面积和屈服强度时变退化公式,建立钢骨混凝土桥墩内部型钢力学性能劣化表征方法,基于OpenSees软件建立考虑腐蚀损伤的钢骨混凝土桥墩全服役期内有限元纤维模型。通过滞回分析及延性分析,了解和掌握全寿命服役过程中钢骨混凝土桥墩的腐蚀损伤和性能劣化机制,探究腐蚀现象对于耗能能力、延性、强度和峰值位移反应的影响规律。结果表明:保护层厚度显著影响锈蚀初始发生时间,型钢腹板性能退化程度对构件性能的影响程度远远小于翼缘。翼缘锈蚀开始后,桥墩抗震性能出现明显的退化现象。
The corrosion initiation time of the steels in the steel reinforced concrete bridge piers was determined based on the finite difference method,with the consideration of multiple environmental factors.The method to describe the deterioration of mechanical property of steel was proposed based on the time-dependent sectional area and yield strength equations of the circular ribbed bars in the marine environment.Finite element models built by OpenSees were to consider the corrosion-induced damage in the whole service life.From hysteretic analysis and ductility analysis,the degradation mechanism,energy dissipation capacity,ductility,strength and peak displacement of steel reinforced concrete bridge piers were investigated.Results indicated that the corrosion initiation time was significantly affected by the cover depth,and the influence of deterioration of web plate on structural seismic performance was far less than the flange.The obvious deterioration of seismic performance was observed after the initiation of flange corrosion.
作者
苑溦
刘振亮
宗莉娜
于艳春
蔡忠奎
YUAN Wei;LIU Zhenliang;ZONG Lina;YU Yanchun;CAI Zhongkui(School of Civil Engineering and Architecture, Jiangsu Open University, Nanjing 210036, China;School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2020年第3期342-350,共9页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金(51908251,51908283)
江苏省高等学校自然科学研究面上项目(19KJB560002,19KJB560013)。
关键词
钢骨混凝土桥墩
初始锈蚀时间
退化模型
抗震性能
全服役期
海浊环境
steel reinforced concrete bridge piers
corrosion initiation time
deterioration model
seismic performance
service life
marine environment
