摘要
混凝土结构开裂严重影响结构性能,采用纤维混凝土加固是减小结构开裂的工程措施之一。基于希尔伯特-黄变换(HHT)提出了钢纤维混凝土加固混凝土重力坝损伤指标识别模型。对纤维含量为1.0%、2.0%和3.0%的三组钢纤维混凝土加固坝体的地震响应时程进行希尔伯特-黄变换。综合考虑结构地震响应频率和幅值的变化,提出基于HHT的结构位移频谱差损伤指标识别模型,并与数值分析中坝体的损伤分布进行对比。结果表明:得到的损伤指标曲线与坝体损伤的分布变化趋势相一致,说明提出的损伤指标对结构损伤识别有较好的敏感性和准确性。
The cracking of concrete structure seriously affects the performance of the structure.The reinforcement of fiber reinforced concrete is one of the engineering measures to reduce the cracking of the structure.Based on the Hilbert-Huang transform(HHT),a damage identification model for steel fiber reinforced concrete reinforced concrete gravity dam is proposed.HHT was carried out on the seismic response time history of three groups of steel fiber reinforced concrete reinforced dams with fiber contents of 1.0%,2.0%and 3.0%.Considering the variation of structural seismic response frequency and amplitude,a HHT-based structural displacement spectral difference damage index recognition model is proposed and compared with the damage distribution of the dam in numerical analysis.The results show that the damage index curve obtained is consistent with the distribution trend of dam damage,which shows that the proposed damage index has better sensitivity and accuracy for structural damage identification.
作者
徐强
刘博
陈健云
李静
徐舒桐
XU Qiang;LIU Bo;CHEN Jianyun;LI Jing;XU Shutong(State Key Labor of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;Institute of Earthquake Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)
出处
《水利与建筑工程学报》
2019年第6期127-132,共6页
Journal of Water Resources and Architectural Engineering
基金
国家重点研发计划“300 m级特高坝抗震安全评价与控制关键技术”(2017YFC0404903)
