: A finite element model of a bridge can be calibrated based on field measurements, and then updated periodically using a structural health monitoring system. The value of a structural parameter such as bending stiffness can be adjusted to measurements using well-known modal updating techniques and monitored in conjunction with external effects such as temperature to assess the condition of the structure. A value of the parameter that is predominant during the period under investigation will be captured, however, in the case of bending stiffness, brief and transitory values could take place as a result of a section exceeding the yield point due to a moving traffic load. Given that the latter is probably the prelude of more severe damage, this paper proposes a novel two-stage method based on the Hilbert-Huang transform combined with a statistical optimization approach to characterize the stiffness changes associated with a non-linear response.
{"title":"Estimation of transitory changes in bending stiffness using the Hilbert-Huang transform","authors":"Arturo González, Hussein Aied","doi":"10.3233/brs-190163","DOIUrl":"https://doi.org/10.3233/brs-190163","url":null,"abstract":": A finite element model of a bridge can be calibrated based on field measurements, and then updated periodically using a structural health monitoring system. The value of a structural parameter such as bending stiffness can be adjusted to measurements using well-known modal updating techniques and monitored in conjunction with external effects such as temperature to assess the condition of the structure. A value of the parameter that is predominant during the period under investigation will be captured, however, in the case of bending stiffness, brief and transitory values could take place as a result of a section exceeding the yield point due to a moving traffic load. Given that the latter is probably the prelude of more severe damage, this paper proposes a novel two-stage method based on the Hilbert-Huang transform combined with a statistical optimization approach to characterize the stiffness changes associated with a non-linear response.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/brs-190163","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43088650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Acceleration-based bridge weigh-in-motion","authors":"Y. M. Mohammed, N. Uddin","doi":"10.3233/BRS-190143","DOIUrl":"https://doi.org/10.3233/BRS-190143","url":null,"abstract":"","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-190143","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47690496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Lateral distribution of live load moment in skewed NEXT beam bridges","authors":"Jianwei Huang","doi":"10.3233/BRS-190145","DOIUrl":"https://doi.org/10.3233/BRS-190145","url":null,"abstract":"","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-190145","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44144741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Numerical investigation of seismic rehabilitation of mass concrete piers of a railway bridge using post-tensioning technique","authors":"A. Tabar, M. Rahbar","doi":"10.3233/BRS-190146","DOIUrl":"https://doi.org/10.3233/BRS-190146","url":null,"abstract":"","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-190146","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47809025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Moving force identification for real-time bridge weigh-in-motion","authors":"Y. M. Mohammed, N. Uddin, E. O'brien","doi":"10.3233/BRS-190144","DOIUrl":"https://doi.org/10.3233/BRS-190144","url":null,"abstract":"","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-190144","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45841211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper introduces a new approach for monitoring and system identification of suspension bridges. The methodology is based on the theoretical formulation of the dynamic response of a suspension bridge and its components. The vibration records are used to identify the boundary conditions and the unknown coefficients in the equations. The goal is to identify the forces in the main components of the bridge, rather than its modal properties. By proper placement of right-type of sensors, it is possible to identify the time-varying forces on the main suspension cables, hangers, towers, and the deck from the records.
{"title":"Monitoring and system identification of suspension bridges: An alternative approach","authors":"E. Şafak","doi":"10.3233/BRS-180141","DOIUrl":"https://doi.org/10.3233/BRS-180141","url":null,"abstract":"This paper introduces a new approach for monitoring and system identification of suspension bridges. The methodology is based on the theoretical formulation of the dynamic response of a suspension bridge and its components. The vibration records are used to identify the boundary conditions and the unknown coefficients in the equations. The goal is to identify the forces in the main components of the bridge, rather than its modal properties. By proper placement of right-type of sensors, it is possible to identify the time-varying forces on the main suspension cables, hangers, towers, and the deck from the records.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-180141","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48793800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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