基于应变测量的桅杆结构拉耳焊缝损伤识别
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摘要
基于桅杆结构拉耳表面应变对其焊缝裂纹扩展长度的敏感度分析,提出了桅杆结构拉耳焊缝损伤的两级模糊模式识别方法,并通过试验研究进行验证。采用有限元模拟建立了拉耳索力-关键点应变-焊缝裂纹扩展长度的模糊模式库;对16个不同裂纹长度的拉耳模型进行试验,以实测拉耳表面关键点应变为待识别样本,采用模糊模式识别方法对索力及焊缝裂纹扩展长度进行分步识别。结果表明:模糊数据库中的模拟数据能够反映拉耳的实际受力状态,识别焊缝裂纹扩展长度与实际裂纹长度具有较好的吻合度;对于不同索力及裂纹长度,识别焊缝裂纹扩展长度的误差在1mm之内,最大隶属度均大于0.8,识别峰值明显;该识别技术具有可行性,是实现桅杆结构损伤智能识别的一种有效手段。
Base on sensitivity analysis of surface strain of ear-plate connection in guyed mast on crack propagation length,a two level fuzzy pattern recognition method was proposed for the damage of welded ear-plate connection in guyed mast,and was verified by experimental study.The fuzzy pattern database of cable forces and key-point strains of ear-plate connections,as well as weld crack propagation lengths was developed by finite element.16 ear-plate connection models with different crack lengths were tested,and the key-point strains were measured to identify cable forces and weld crack propagation lengths by the proposed method.The results show that the simulated data in fuzzy database can reflect the actual stress state of ear-plate connection,and the identified weld crack lengths agree well with the actual weld crack lengths.For the different cable forces and crack propagation lengths,the error of identified weld crack length is within 1mm,the maximum membership degree is greater than 0.8,and the recognition peak is obvious.The recognition technology is feasible and is an effective method to realize the damage intelligent identification of guyed mast.
Base on sensitivity analysis of surface strain of ear-plate connection in guyed mast on crack propagation length,a two level fuzzy pattern recognition method was proposed for the damage of welded ear-plate connection in guyed mast,and was verified by experimental study.The fuzzy pattern database of cable forces and key-point strains of ear-plate connections,as well as weld crack propagation lengths was developed by finite element.16 ear-plate connection models with different crack lengths were tested,and the key-point strains were measured to identify cable forces and weld crack propagation lengths by the proposed method.The results show that the simulated data in fuzzy database can reflect the actual stress state of ear-plate connection,and the identified weld crack lengths agree well with the actual weld crack lengths.For the different cable forces and crack propagation lengths,the error of identified weld crack length is within 1mm,the maximum membership degree is greater than 0.8,and the recognition peak is obvious.The recognition technology is feasible and is an effective method to realize the damage intelligent identification of guyed mast.
引文
[1]GIOFFRE M,CAVALAGLI N,GUSELLA V.Movable Guyed Masts Affected by Wind Loads:Buckling and Stochastic Response[J].Structure Control and Heath Monitoring,2008,15(3):299-314.
[2]REPETTO M P,SOLARI G.Wind-induced Fatigue Collapse of Real Slender Structures[J].Engineering Structures,2010,32(12):3888-3898.
[3]徐建波,邓洪洲,王肇民.考虑非高斯和宽带修正的桅杆风振疲劳分析[J].同济大学学报:自然科学版,2004,32(7):889-892.XU Jian-bo,DENG Hong-zhou,WANG Zhao-min.Study on Stochastic Fatigue of Guyed Masts Under Wind Load Considering No-Gaussian and Wide-band Modification[J].Journal of Tongji University:Natural Science,2004,32(7):889-892.
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[6]瞿伟廉,彭琦.桅杆结构竖向杆件损伤位置识别的时域方法[J].地震工程与工程振动,2007,27(5):110-116.QU Wei-lian,PENG Qi.Damage Detection Method for Vertical Bars of Mast Structure in Time Domain[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(5):110-116.
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[8]徐志宏,邓洪洲.桅杆结构纤绳与杆身连接拉耳风致疲劳寿命预测[J].特种结构,2004,21(3):25-27.XU Zhi-hong,DENG Hong-zhou.Prediction on Windinduced Fatigue Service Life of Ear-plate Connection Between Cable and Tower of Guyed Mast[J].Special Structures,2004,21(3):25-27.
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[10]瞿伟廉,鲁丽君,李明.桅杆结构纤绳拉耳任意形状孔边裂纹SIF计算[J].武汉理工大学学报,2009,31(1):54-58.QU Wei-lian,LU Li-jun,LI Ming.Calculation of Stress Intensity Factor of Crack at Hole for Ear Plate Connecting Cable with Guyed Mast[J].Journal of Wuhan University of Technology,2009,31(1):54-58.
[11]王欣学.桅杆结构拉耳焊缝三维穿透裂纹扩展的模糊模式识别方法[D].武汉:武汉理工大学,2010.WANG Xin-xue.Fuzzy Mode Identification Method for Propagation of 3-D Straight Through Crack of Ear Plate of Mast Structure[D].Wuhan:Wuhan University of Technology,2010.
[12]王文利.桅杆结构拉耳裂纹萌生的疲劳损伤评定[D].武汉:武汉理工大学,2008.WANG Wen-li.Evaluation on Fatigue Damage of Guyed Mast's Ear-plate[D].Wuhan:Wuhan University of Technology,2008.
[13]王文利,瞿伟廉,皮永林.考虑焊接残余应力的桅杆结构拉耳节点风致疲劳裂纹萌生寿命评定[J].土木工程学报,2010,43(增2):22-27.WANG Wen-li,QU Wei-lian,PI Yong-lin.Assessment of Wind-induced Fatigue Crack Initiation Life at Guyed Mast Ear-plate Joints Considering Welding Residual Stresses[J].China Civil Engineering Journal,2010,43(S2):22-27.
[14]贾志伟.桅杆结构拉耳焊接节点疲劳试验研究[D].武汉:武汉理工大学,2012.JIA Zhi-wei.Experimental Study of Fatigue Life for Guyed Mast's Earplate Welded Joint[D].Wuhan:Wuhan University of Technology,2012.
[15]王艺霖,刘西拉,方从启.基于应变指标的桥梁损伤识别方法[J].建筑科学与工程学报,2011,28(2):62-68.WANG Yi-lin,LIU Xi-la,FANG Cong-qi.Bridge Damage Detection Method Based on Strain Index[J].Journal of Architecture and Civil Engineering,2011,28(2):62-68.
[16]王清涛.基于模糊模式识别的风力作用下高耸结构应力场的识别[D].武汉:武汉理工大学,2008.WANG Qing-tao.The Distinguish of Tall and Erect Structure Stress Ground Under Wind Load Based on Blurred Mode Distinguish[D].Wuhan:Wuhan University of Technology,2008.
[17]王倩.网架结构节点焊缝拉裂等效有限元模型与损伤识别[D].武汉:武汉理工大学,2015.WANG Qian.Equivalent Finite Element and Damage Identification on Joint Weld with a Crack of Grid Structure[D].Wuhan:Wuhan University of Technology,2015.
[18]郭桂蓉.模糊模式识别[M].长沙:国防科技大学出版社,1992.GUO Gui-rong.Fuzzy Pattern Recognition[M].Changsha:National University of Defense Technology Press,1992.
[2]REPETTO M P,SOLARI G.Wind-induced Fatigue Collapse of Real Slender Structures[J].Engineering Structures,2010,32(12):3888-3898.
[3]徐建波,邓洪洲,王肇民.考虑非高斯和宽带修正的桅杆风振疲劳分析[J].同济大学学报:自然科学版,2004,32(7):889-892.XU Jian-bo,DENG Hong-zhou,WANG Zhao-min.Study on Stochastic Fatigue of Guyed Masts Under Wind Load Considering No-Gaussian and Wide-band Modification[J].Journal of Tongji University:Natural Science,2004,32(7):889-892.
[4]周凌,程华,王仲刚,等.基于WVD交叉项统计特征的桅杆结构损伤识别[J].土木建筑与环境工程,2009,31(4):13-18,30.ZHOU Ling,CHENG Hua,WANG Zhong-gang,et al.Damage Identification for Guyed Mast Based on WVD Cross-term Statistic Distinction[J].Journal of Civil,Architectural&Environmental Engineering,2009,31(4):13-18,30.
[5]程华.基于时频分布的桅杆结构损伤识别方法及试验研究[D].重庆:重庆大学,2005.CHENG Hua.A Time-frequency Damage Identification Method and Experimental Study for Guyed Masts[D].Chongqing:Chongqing University,2005.
[6]瞿伟廉,彭琦.桅杆结构竖向杆件损伤位置识别的时域方法[J].地震工程与工程振动,2007,27(5):110-116.QU Wei-lian,PENG Qi.Damage Detection Method for Vertical Bars of Mast Structure in Time Domain[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(5):110-116.
[7]ROY S,PARK Y C,SAUSE R,et al.Fatigue Resistance of Pole-to-base Plate Connections in High Level Lighting Structures[C]//ASCE.Proceedings of 2010Structures Congress.Reston:ASCE,2010:170-180.
[8]徐志宏,邓洪洲.桅杆结构纤绳与杆身连接拉耳风致疲劳寿命预测[J].特种结构,2004,21(3):25-27.XU Zhi-hong,DENG Hong-zhou.Prediction on Windinduced Fatigue Service Life of Ear-plate Connection Between Cable and Tower of Guyed Mast[J].Special Structures,2004,21(3):25-27.
[9]鲁丽君.桅杆结构纤绳连接拉耳风致疲劳裂纹萌生与扩展寿命预测[D].武汉:武汉理工大学,2008.LU Li-jun.Prediction of Germination and Propagation Life of Wind Induced Fatigue Crack of Ear-plate Connecting Guyed-mast to Cables[D].Wuhan:Wuhan University of Technology,2008.
[10]瞿伟廉,鲁丽君,李明.桅杆结构纤绳拉耳任意形状孔边裂纹SIF计算[J].武汉理工大学学报,2009,31(1):54-58.QU Wei-lian,LU Li-jun,LI Ming.Calculation of Stress Intensity Factor of Crack at Hole for Ear Plate Connecting Cable with Guyed Mast[J].Journal of Wuhan University of Technology,2009,31(1):54-58.
[11]王欣学.桅杆结构拉耳焊缝三维穿透裂纹扩展的模糊模式识别方法[D].武汉:武汉理工大学,2010.WANG Xin-xue.Fuzzy Mode Identification Method for Propagation of 3-D Straight Through Crack of Ear Plate of Mast Structure[D].Wuhan:Wuhan University of Technology,2010.
[12]王文利.桅杆结构拉耳裂纹萌生的疲劳损伤评定[D].武汉:武汉理工大学,2008.WANG Wen-li.Evaluation on Fatigue Damage of Guyed Mast's Ear-plate[D].Wuhan:Wuhan University of Technology,2008.
[13]王文利,瞿伟廉,皮永林.考虑焊接残余应力的桅杆结构拉耳节点风致疲劳裂纹萌生寿命评定[J].土木工程学报,2010,43(增2):22-27.WANG Wen-li,QU Wei-lian,PI Yong-lin.Assessment of Wind-induced Fatigue Crack Initiation Life at Guyed Mast Ear-plate Joints Considering Welding Residual Stresses[J].China Civil Engineering Journal,2010,43(S2):22-27.
[14]贾志伟.桅杆结构拉耳焊接节点疲劳试验研究[D].武汉:武汉理工大学,2012.JIA Zhi-wei.Experimental Study of Fatigue Life for Guyed Mast's Earplate Welded Joint[D].Wuhan:Wuhan University of Technology,2012.
[15]王艺霖,刘西拉,方从启.基于应变指标的桥梁损伤识别方法[J].建筑科学与工程学报,2011,28(2):62-68.WANG Yi-lin,LIU Xi-la,FANG Cong-qi.Bridge Damage Detection Method Based on Strain Index[J].Journal of Architecture and Civil Engineering,2011,28(2):62-68.
[16]王清涛.基于模糊模式识别的风力作用下高耸结构应力场的识别[D].武汉:武汉理工大学,2008.WANG Qing-tao.The Distinguish of Tall and Erect Structure Stress Ground Under Wind Load Based on Blurred Mode Distinguish[D].Wuhan:Wuhan University of Technology,2008.
[17]王倩.网架结构节点焊缝拉裂等效有限元模型与损伤识别[D].武汉:武汉理工大学,2015.WANG Qian.Equivalent Finite Element and Damage Identification on Joint Weld with a Crack of Grid Structure[D].Wuhan:Wuhan University of Technology,2015.
[18]郭桂蓉.模糊模式识别[M].长沙:国防科技大学出版社,1992.GUO Gui-rong.Fuzzy Pattern Recognition[M].Changsha:National University of Defense Technology Press,1992.