基于频率变化的钢管混凝土柱损伤评价
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摘要
为研究钢管混凝土柱在疲劳破坏后的损伤规律,进行了6根钢管混凝土柱在不同侧移率工况下的低周往复试验,并通过锤击法模态测试获取钢管混凝土柱完好状态及破坏后的模态参数。基于Ghobarah损伤指标提出了模态频率与有限元模拟相结合的损伤识别方法,并利用此方法求得了不同工况下钢管混凝土柱的损伤。研究表明,利用模态频率与有限元模拟相结合的方法进行损伤评估结果真实可靠,此方法与基于频率的损伤指标方法计算结果相近,得出了钢管混凝土柱疲劳破坏后的总损伤程度随侧移率增加而增加的规律。
To study the damage pattern after fatigue rupture of CFST column,the low-cyclic loading tests on six CFST columns under different drift ratio are carried on,and parameters of the CFST column are measured separately in good and damaged condition through the hammer test modal. The damage identification methods which combine modal frequency with finite element simulation are put forward based on the Ghtheobarah damage index,and the damage of CFST column under different working conditions is obtained by using this method. The results show that the method of the combination of modal frequency and finite element simulation is reliable. This method is similar to the result of damage index method based on frequency,and the regular pattern which total damage degree of CFST column after the fatigue damage increase with the increase of the drift ratio is obtained.
To study the damage pattern after fatigue rupture of CFST column,the low-cyclic loading tests on six CFST columns under different drift ratio are carried on,and parameters of the CFST column are measured separately in good and damaged condition through the hammer test modal. The damage identification methods which combine modal frequency with finite element simulation are put forward based on the Ghtheobarah damage index,and the damage of CFST column under different working conditions is obtained by using this method. The results show that the method of the combination of modal frequency and finite element simulation is reliable. This method is similar to the result of damage index method based on frequency,and the regular pattern which total damage degree of CFST column after the fatigue damage increase with the increase of the drift ratio is obtained.
引文
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[3]纪晓东,张明亮,刘平,等.钢管混凝土组合柱累积损伤性能试验研究[J].建筑结构学报,2013,34:35-44.Ji Xiaodong,Zhang Mingliang,Liu Ping,et al.Experimental study of cumulative damage performance of steel tube-reinforced concrete composite columns[J].Journal of Building Structures,2013,34:35-44.(in Chinese)
[4]张国伟.钢管混凝土柱在地震作用下的累计损伤性能研究[D].长沙:湖南大学,2009.Zhang Guowei.Research on Cumulative Seismic damage of CFT columns[D].Changsha:Hunan University,2009.(in Chinese)
[5]张战廷,刘宇锋.ABAQUS中的混凝土塑性损伤模型[J].建筑结构,2011,21:230-231.Zhang Zhanting,Liu Yufeng.Concrete damaged plasticity model in ABAQUS[J].Building Structure,2011,21:230-231.(in Chinese)
[6]王阳杰.基于ABAQUS的钢管混凝土柱有限元分析[J].福建建设科技,2014:36-39.Wang Yangjie.The finite element analysis of concretefilled thin-walled steel tube columns based on ABAQUS[J].Fujian Construction Technology,2014:36-39.(in Chinese)
[7]Ghobarah A,Abou-Elfath H,Biddah A.Responsebased damage assessment of structures[J].Earthquake Engineering and Structural Dynamics,1999,28(1):79-104.
[8]叶献国,种迅,李康宁,等.Pushover方法与循环往复加载分析的研究[J].合肥工业大学学报:自然科学版,2001,24(6):1019-1024.Ye Xianguo,Zhong Xun,Li Kangning,et al.Study of pushover analysis procedure and reversal load pattern[J].Journal of Hefei University of Technology,2001,24(6):1019-1024.(in Chinese)
[9]夏樟华,李嘉维,夏坚,等.基于频率退化的砌体房屋结构抗震性能评价[J].工业建筑,2015,45(4):92-97.Xia Zhanghua,Li Jiawei,Xia Jian,et al.Seismic performance assessment of brick masonry structures with percast slabs based on deterioration of frequency[J].Industrial building,2015,45(4):92-97.(in Chinese)