一种钢管焊接结构焊接节点损伤识别的新方法
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摘要
采用端部半刚性连接梁单元模型进行模拟焊接节点的损伤,并基于应变模态理论,提出了一种焊接节点损伤识别两步法。第一步,先整体测量结构的位移模态并推导出应变模态,然后采用改进后的目标函数,通过信赖域优化算法对损伤节点位置进行准确判定;第二步,采用提出的杆端应变模态变化比指标,实现焊接节点损伤程度的精确识别。经工程实例的数值仿真及试验分析,验证了该方法的有效性及优越性,为解决这类大型焊接结构焊接节点的损伤识别问题提供了新思路。
The damage of welded joints is simulated with a semi-rigid connection model.According to the strain mode theory,a two-step damage detection method is proposed.First,strain modal parameters are deduced from displacement modal parameters based on the holistic modal testing and then the improved objective function is used to locate the structural damage correctly by trust region optimization algorithm.Second,the variation in element-end strain modal index is used to detect the structural damage exactly.The numerical simulation and experimental analysis of engineering examples show that the improved damage detection method is more desirable which provides a new idea for the damage detection of welded joints in large welded structures.
The damage of welded joints is simulated with a semi-rigid connection model.According to the strain mode theory,a two-step damage detection method is proposed.First,strain modal parameters are deduced from displacement modal parameters based on the holistic modal testing and then the improved objective function is used to locate the structural damage correctly by trust region optimization algorithm.Second,the variation in element-end strain modal index is used to detect the structural damage exactly.The numerical simulation and experimental analysis of engineering examples show that the improved damage detection method is more desirable which provides a new idea for the damage detection of welded joints in large welded structures.
引文
[1]王天辉,马立元,李世龙,等.基于量子遗传算法的钢管焊接结构焊缝损伤识别[J].海军工程大学学报,2012,24(6):89-94.WANG Tian-hui,MA Li-yuan,LI Shi-long,et al.Damage detection of weld seam damage on steel tube welded structures by quantum genetic algorithm[J].Journal of Naval University of Engineering,2012,24(6):89-94.(in Chinese)
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[7]彭细荣,路新瀛,隋允康,等.基于应变模态及结构优化技术的结构损伤程度识别方法[J].北京工业大学学报,2009,35(2):145-150.PENG Xi-rong,LU Xin-ying,SUI Yun-kang,et al.Damage degree identification method based on strain mode and structural optimization[J].Journal of Beijing University of Technology,2009,35(2):145-150.(in Chinese)
[8]吴春利.基于应变模态桥梁健康监测关键技术研究[D].长春:吉林大学,2012.
[2]顾培英,邓昌,汤雷.基于工作应变模态损伤识别方法的试验研究[J].振动与冲击,2011,30(11):175-178.GU Pei-ying,DENG Chang,TANG Lei.Experimental study on damage identification based on operational strain modal shape[J].Journal of Vibration and Shock,2011,30(11):175-178.(in Chinese)
[3]瞿伟廉,陈超,魏文辉.基于应变模态的钢结构构件焊缝损伤定位方法的研究[J].世界地震工程,2002,18(2):1-7.QU Wei-lian,CHEN Chao,WEI Wen-hui.The methods of identifying damage location for weld in members for steel structure based on strain mode[J].World Earthquake Engineering,2002,18(2):1-7.(in Chinese)
[4]马立元,李世龙,李永军,等.基于子结构及模态柔度曲率差的某框架结构损伤识别[J].海军工程大学学报,2011,23(5):21-26.MA Li-yuan,LI Shi-long,LI Yong-jun,et al.Damage identification of a frame based on substructure and modal flexibility curvature difference[J].Journal of Naval University of Engineering,2011,23(5):21-26.(in Chinese)
[5]谭晋鹏.基于信赖域法的结构动力优化设计方法研究[D].北京:清华大学,2006.
[6]李军,于德栋,白会人.基于应变模态的结构损伤定位方法[J].世界地震工程,2007,23(1):104-109.LI Jun,YU De-dong,BAI Hui-ren.Damage localization of changes based on the strain modes for simply supported beam[J].World Earthquake Engineering,2007,23(1):104-109.(in Chinese)
[7]彭细荣,路新瀛,隋允康,等.基于应变模态及结构优化技术的结构损伤程度识别方法[J].北京工业大学学报,2009,35(2):145-150.PENG Xi-rong,LU Xin-ying,SUI Yun-kang,et al.Damage degree identification method based on strain mode and structural optimization[J].Journal of Beijing University of Technology,2009,35(2):145-150.(in Chinese)
[8]吴春利.基于应变模态桥梁健康监测关键技术研究[D].长春:吉林大学,2012.
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