Structural health monitoring(SHM)has become a hot and intensively researched field in civil engineering.Thereinto,damage identification play an important role in maintaining structural integrity and safety.Many effect...Structural health monitoring(SHM)has become a hot and intensively researched field in civil engineering.Thereinto,damage identification play an important role in maintaining structural integrity and safety.Many effective methods have been proposed for damage identification.However,accurate global identification of large real-world structures is not easy due to their complex and often unknown boundary conditions,nonlinear components,insensitivity of global response to localized damages,etc.Furthermore,global identification often requires lots of sensors and involves large number of unknowns.This is costly,rarely feasible in practice,and usually yields severely ill-conditioned identification problems.Substructuring approach is a possible solution:substructuring methods can focus on local small substructures;they need only a few sensors placed on the substructure and yield smaller and numerically much more feasible identification problems.This paper proposed an improved substructure method using local free response for substructure damage identification.The virtual supports are constructed by Substructure Isolation Method(SIM)using the linear combination of the substructural responses.The influence of the global errors is isolated by adding the virtual supports on the main degree of freedoms(DOFs)of the substructure.Through the correlation analysis,the substructural modes are selected and used for damage identification of the substructure.A plain model of cable stayed bridge is used for the verification of the proposed method.展开更多
基金国家自然科学基金项目(50579008)Support of the Foundation for Polish Science through TEAM Programme‘Smart&Safe+3 种基金co-financed by the EU European Regional Development Fundsupport of Structural Funds in the Operational Programme-Innovative Economy(IEOP)financed from the European Regional Development Fund-Projects No POIG.0101.02-00-013/08-00(MONIT)大连民族学院科研基金项目(20116207)大连民族学院自主科研基金项目(DC10040116)
基金国家自然科学基金项目资助(50579008)Support of the Foundation for Polish Science through TEAM Programme‘Smart&Safe’co-financed by the EUEuropean Regional Development Fund
基金国家自然科学基金资助项目(5110806651108057)Financial Support of Structural Funds in the Operational Programme-Innovative Economy(IEOP)Financed from the European Regional Development Fund-Projects"Health Monitoring and Lifetime assessment of Structures"(No POIG.0101.02-00-013/08-00)
基金support by the National Natural Science Foundation of China(NSFC)(Grand No.51108057)the National Basic Research Program of China(973 Program)(Grand No.2013CB036305)+4 种基金the Fundamental Research Funds for the Central Universities(China)(Grand No.DUT13LK13)Special Financial Grant from the China Postdoctoral Science Foundation(Grand No.2012T50255)the Project of National Key Technology R&D Program(China)(Grand Nos.2011BAK02B01,2011BAK02B03,2006BAJ03B05)the Polish National Science Centre Project"AIA"(Grand No.DEC-2012/05/B/ST8/02971)the FP7 EU project Smart-Nest(Grand No.PIAPP-GA-2011-28499)
文摘Structural health monitoring(SHM)has become a hot and intensively researched field in civil engineering.Thereinto,damage identification play an important role in maintaining structural integrity and safety.Many effective methods have been proposed for damage identification.However,accurate global identification of large real-world structures is not easy due to their complex and often unknown boundary conditions,nonlinear components,insensitivity of global response to localized damages,etc.Furthermore,global identification often requires lots of sensors and involves large number of unknowns.This is costly,rarely feasible in practice,and usually yields severely ill-conditioned identification problems.Substructuring approach is a possible solution:substructuring methods can focus on local small substructures;they need only a few sensors placed on the substructure and yield smaller and numerically much more feasible identification problems.This paper proposed an improved substructure method using local free response for substructure damage identification.The virtual supports are constructed by Substructure Isolation Method(SIM)using the linear combination of the substructural responses.The influence of the global errors is isolated by adding the virtual supports on the main degree of freedoms(DOFs)of the substructure.Through the correlation analysis,the substructural modes are selected and used for damage identification of the substructure.A plain model of cable stayed bridge is used for the verification of the proposed method.