空间网格结构节点螺栓松动损伤定位有限元分析
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摘要
以单层柱面网壳试验模型为背景进行损伤定位研究,采用ANSYS软件对其螺栓松动损伤进行了有限元分析,利用神经网络的模式分类功能进行了螺栓松动的分步损伤定位,即首先以整体结构为研究对象,采用面向子结构的损伤定位,确定结构是否存在损伤及损伤的大致位置;然后采用面向节点的损伤定位法,确定子结构中螺栓松动损伤的节点位置。研究结果表明:损伤识别的成功率与杆件灵敏度密切相关,为了保证识别结果准确性,其灵敏度达到2%以上才能正确识别,当杆件的灵敏度过低时将无法通过动力测试识别;采用分步损伤定位方法可以显著减少损伤精确定位时训练样本的数量,适合于不完备的模态数据,利用低阶模态数据即可准确识别损伤的子结构与节点位置。
Damage location was studied based on single-layer latticed cylindrical shell experiment model.Finite element analysis for the looseness of the bolt-ball was done by FEA software ANSYS using neural network pattern classification.The analysis focused on the whole structure.The sub-structure oriented damage location method was used in order to verify if there' s damage and the general location of the damage.Then the node-location oriented technique was used to confirm the accurate location of the loosened bolt-ball.By finite element analysis and experimental results,damage identification is related to the sensitivity of the bolt-ball.To get the right result,the sensitivity should be more than 2%.The above mentioned method,based on incomplete modal data,can be used for the location of loosened bolt-ball.The above mentioned method,based on incomplete modal data,can be used for the location of the loose of the bolt-ball.
Damage location was studied based on single-layer latticed cylindrical shell experiment model.Finite element analysis for the looseness of the bolt-ball was done by FEA software ANSYS using neural network pattern classification.The analysis focused on the whole structure.The sub-structure oriented damage location method was used in order to verify if there' s damage and the general location of the damage.Then the node-location oriented technique was used to confirm the accurate location of the loosened bolt-ball.By finite element analysis and experimental results,damage identification is related to the sensitivity of the bolt-ball.To get the right result,the sensitivity should be more than 2%.The above mentioned method,based on incomplete modal data,can be used for the location of loosened bolt-ball.The above mentioned method,based on incomplete modal data,can be used for the location of the loose of the bolt-ball.
引文
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[18]MATLAB中文论坛.MATLAB神经网络30个案例分析[M].北京:北京航空航天大学出版社,2010:46-65.
[19]吴金志.基于动力检测的网格结构损伤识别研究[D].北京:北京工业大学,2005:23-33.(Wu Jinzhi.Research on damage identification of grid structuresbased on the vibration parameters[D].Beijing:BeijingUniversity of Technology,2005:23-33.(in Chinese))
[20]金海,南菲.利用组合模态参数识别结构损伤的神经网络法[J].厦门大学学报,2011,50(5):856-861.(Jin Hai,Nan Fei.Structural damageidentification based on combination of modal parametersusing neural networks[J].Journal of XiamenUniversity,2011,50(5):856-861.(in Chinese))
[21]杨大彬,张毅刚,吴金志.基于ANSYS的灵敏度分析及其在单层网壳中的应用[J].世界地震工程,2009,25(4):87-91.(Yang Dabin,Zhang Yigang,WuJinzhi.Sensitivity analysis based on ANSYS and itsapplication to single-layer reticulated shell[J].WorldEarthquake Engineering,2009,25(4):87-91.(inChinese))
[2]JG/T10—2009钢网架螺栓球节点[S].北京:中国标准出版社,2010.(JG/T10—2009The boltedjoints of space grid structures[S].Beijing:ChinaStandards Press,2010.(in Chinese))
[3]John Chilton.Space gird structures[M].Oxford,Britain:Architectural Press,2000:21-43.
[4]Caglayan O,Yuksel E.Experimental and finite elementinvestigations on the collapse of a Mero space truss roofstructure:a case study[J].Engineering FailureAnalysis,2008,15(5):458-470.
[5]Ghasemi M,Davoodi M R,Mostafavian S A.Tensilestiffness of Mero-type connector regarding bolt tightness[J].Journal of Applied Science,2010,10(9):724-730.
[6]陈志华,吴锋,闫翔宇,等.国内空间结构节点综述[J].建筑科学,2007,23(9):93-97.(Chen Zhihua,Wu Feng,Yan Xiangyu,et al.The state of arts:jointsof space structures in China[J].Building Science,2007,23(9):93-97.(in Chinese))
[7]丁芸孙.网(壳)架及轻钢结构设计、施工及检验的有关问题探讨:上[J].空间结构,2004,10(1):31-40.(Ding Yunsun.Discussion on design,construction andinspection of space grid structures and light-weight steelstructures:part I[J].Spatial Structure,2004,10(1):31-40.(in Chinese))
[8]谭冬梅,瞿伟廉,秦文科.基于小波包和模糊聚类的输电塔结构损伤诊断[J].天津大学学报,2011,44(8):695-700.(Tan Dongmei,Qu Weilian,QinWenke.Damage identification of transmission towerbased on wavelet packet transform and fuzzy clustering[J].Journal of Tianjin University,2011,44(8):695-700.(in Chinese))
[9]王莹,李兆霞,钱方.结构连接刚度损伤的识别方法[J].东南大学学报,2011,41(4):829-835.(Wang Ying,Li Zhaoxia,Qian Fang.Identification ofdamage in connecting stiffness of steel structures[J].Journal of Southeast University,2011,41(4):829-835.(in Chinese))
[10]王丹生,朱宏平,鲁晶晶,等.基于压电导纳的钢框架螺栓松动检测试验研究[J].振动与冲击,2007,26(10):157-160.(Wang Dansheng,Zhu Hongping,Lu Jingjing,et al.Experimental study on detectingloosened bolts of a steel frame based on piezoelectricADM ittance[J].Journal of Vibration and Shock,2007,26(10):157-160.(in Chinese))
[11]张毅刚,吴金志,梁鑫.面向节点的网格结构损伤定位方法[J].北京工业大学学报,2004,30(2):171-175.(Zhang Yigang,Wu Jinzhi,Liang Xin.Localization method of nodes oriented grid structuraldamage[J].Journal of Beijing University ofTechnology,2004,30(2):171-175.(in Chinese))
[12]丁阳,张玉峰,李忠献.大跨度空间网格结构的损伤定位[J].建筑结构学报,2006,27(1):17-23.(DING Yang,ZHANG Yufeng,LI Zhongxian.Damagelocalization for long-span spatial lattice structures[J].Journal of Building Structures,2006,27(1):17-23.(in Chinese))
[13]宋玉普,刘志鑫,纪卫红.基于模态应变能与神经网络的钢网架损伤检测方法[J].土木工程学报,2007,40(10):13-18.(Song Yupu,Liu Zhixin,JiWeihong.Damage diagnosis of spatial trusses based onmodal strain energy and neural network[J].China CivilEngineering Journal,2007,40(10):13-18.(inChinese))
[14]Fan Wei,Qiao Pizhong.Vibration-based damageidentification methods:a review and comparative study[J].Structural Health Monitoring,2012,10(1):83-108.
[15]安永辉,欧进萍.大跨度钢桁桥模型的精细化损伤定位模拟和试验研究[J].计算力学学报,2011,28(5):730-736.(An Yonghui,Ou Jinping.Experimentaland numerical studies on precise damage localization ofa long-span steel truss bridge model[J].ChineseJournal of Computational Mechanics,2011,28(5):730-736.(in Chinese))
[16]周宜哲.考虑蒙皮效应的单层柱面网壳振动台试验及其性能研究[D].北京:北京工业大学,2012:41-46.(Zhou Yizhe.Study on shaking table tests forsingle-layer reticulated cylindrical shells with skindiaphragm[D].Beijing:Beijing University ofTechnology,2012:41-46.(in Chinese))
[17]姜绍飞,吴兆旗.结构健康监测与智能信息处理技术及应用[M].北京:中国建筑工业出版社,2011:157-180.
[18]MATLAB中文论坛.MATLAB神经网络30个案例分析[M].北京:北京航空航天大学出版社,2010:46-65.
[19]吴金志.基于动力检测的网格结构损伤识别研究[D].北京:北京工业大学,2005:23-33.(Wu Jinzhi.Research on damage identification of grid structuresbased on the vibration parameters[D].Beijing:BeijingUniversity of Technology,2005:23-33.(in Chinese))
[20]金海,南菲.利用组合模态参数识别结构损伤的神经网络法[J].厦门大学学报,2011,50(5):856-861.(Jin Hai,Nan Fei.Structural damageidentification based on combination of modal parametersusing neural networks[J].Journal of XiamenUniversity,2011,50(5):856-861.(in Chinese))
[21]杨大彬,张毅刚,吴金志.基于ANSYS的灵敏度分析及其在单层网壳中的应用[J].世界地震工程,2009,25(4):87-91.(Yang Dabin,Zhang Yigang,WuJinzhi.Sensitivity analysis based on ANSYS and itsapplication to single-layer reticulated shell[J].WorldEarthquake Engineering,2009,25(4):87-91.(inChinese))
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