Pub Date : 2021-07-03DOI: 10.1080/24705314.2021.1906092
C. McGeown, F. Huseynov, D. Hester, P. McGetrick, E. OBrien, V. Pakrashi
ABSTRACT A recent survey of Europe’s highway infrastructure has concluded that almost half of Europe’s bridges are nearing the end of their design live. Work in the wider Structural Health Monitoring sector is aiming to develop reliable and cost-effective methods for verifying condition, remaining service life and safety of ageing structures. Most bridge condition assessment methods are based on deflection, acceleration or strain measurements. This paper looks at the possibility of using rotation measurements as a main parameter to identify damage. This study looks at numerical analyses of a moving point load on a one-dimensional bridge model to provide the theoretical basis of the proposed damage detection method. It is shown that when local damage occurs, even when it is remote from a sensor location, it results in an increase in the magnitude of rotation measurements. This study looks at how best to exploit this fact for damage detection. A number of damage scenarios, sensor locations, and load arrangements are investigated in this study and their influence on the ability of the algorithm to detect damage are reported.
{"title":"Using measured rotation on a beam to detect changes in its structural condition","authors":"C. McGeown, F. Huseynov, D. Hester, P. McGetrick, E. OBrien, V. Pakrashi","doi":"10.1080/24705314.2021.1906092","DOIUrl":"https://doi.org/10.1080/24705314.2021.1906092","url":null,"abstract":"ABSTRACT A recent survey of Europe’s highway infrastructure has concluded that almost half of Europe’s bridges are nearing the end of their design live. Work in the wider Structural Health Monitoring sector is aiming to develop reliable and cost-effective methods for verifying condition, remaining service life and safety of ageing structures. Most bridge condition assessment methods are based on deflection, acceleration or strain measurements. This paper looks at the possibility of using rotation measurements as a main parameter to identify damage. This study looks at numerical analyses of a moving point load on a one-dimensional bridge model to provide the theoretical basis of the proposed damage detection method. It is shown that when local damage occurs, even when it is remote from a sensor location, it results in an increase in the magnitude of rotation measurements. This study looks at how best to exploit this fact for damage detection. A number of damage scenarios, sensor locations, and load arrangements are investigated in this study and their influence on the ability of the algorithm to detect damage are reported.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"159 - 166"},"PeriodicalIF":2.1,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2021.1906092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43579081","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}
Pub Date : 2021-07-03DOI: 10.1080/24705314.2021.1921952
J. Goggins
Papers contained in this special issue on “Sustainable and Resilient Structures” have been shortlisted from the papers presented at the Civil Engineering Research in Ireland 2020 (CERI2020) conference hosted by Munster Technology University, Ireland, in August 2020. The organisation of the CERI2020 conference was overseen by the Civil Engineering Research Association of Ireland (CERAI) which was formed in 2012 for the purpose of promoting civil engineering research and practice in Ireland, and its communication to academics and practitioners. The shortlisted papers were extended by the authors for this special issue and peer reviewed by international experts. The paper which I co-authored was handled independently by Dr Thomas Kang, Editor-in-Chief of Journal of Structural Integrity and Maintenance. As you will see from the special issue, there has been emphasis on applications, as well as theory, to maintain relevance to both industry and academia. The papers focus on sustainable and resilient structures for a range of applications from civil engineering infrastructures (bridges), to buildings and energy infrastructure (wind energy). I hope that this special issue on “Sustainable and Resilient Structures” will be of interest and use to all and a good reference to both researchers and practicing engineers.
{"title":"Sustainable and resilient structures","authors":"J. Goggins","doi":"10.1080/24705314.2021.1921952","DOIUrl":"https://doi.org/10.1080/24705314.2021.1921952","url":null,"abstract":"Papers contained in this special issue on “Sustainable and Resilient Structures” have been shortlisted from the papers presented at the Civil Engineering Research in Ireland 2020 (CERI2020) conference hosted by Munster Technology University, Ireland, in August 2020. The organisation of the CERI2020 conference was overseen by the Civil Engineering Research Association of Ireland (CERAI) which was formed in 2012 for the purpose of promoting civil engineering research and practice in Ireland, and its communication to academics and practitioners. The shortlisted papers were extended by the authors for this special issue and peer reviewed by international experts. The paper which I co-authored was handled independently by Dr Thomas Kang, Editor-in-Chief of Journal of Structural Integrity and Maintenance. As you will see from the special issue, there has been emphasis on applications, as well as theory, to maintain relevance to both industry and academia. The papers focus on sustainable and resilient structures for a range of applications from civil engineering infrastructures (bridges), to buildings and energy infrastructure (wind energy). I hope that this special issue on “Sustainable and Resilient Structures” will be of interest and use to all and a good reference to both researchers and practicing engineers.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"135 - 135"},"PeriodicalIF":2.1,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2021.1921952","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45528180","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}
Pub Date : 2021-07-03DOI: 10.1080/24705314.2021.1906088
R. Corbally, A. Malekjafarian
ABSTRACT Ongoing inspection and maintenance of bridges poses a challenging task for infrastructure owners who must manage large bridge stocks with limited budgets. Drive-by monitoring approaches, using sensors in a vehicle, provide a promising solution to this challenge. This paper investigates the use of the response at the point-of-contact between the tyre and the bridge as a means of monitoring bridge frequency. An expression is derived to allow the contact-point (CP) response to be inferred directly from in-vehicle measurements, expanding on previous studies by allowing the vehicle suspension characteristics to be considered. The sensitivity of the CP-response to the pavement characteristics is investigated in detail and a rigid-disk model is used to overcome issues with how existing vehicle-bridge interaction models consider the interaction between the wheel and the pavement. The feasibility of the CP-response as a measure of bridge condition is investigated and results show that the CP-response significantly outperforms the response measured directly on the vehicle. The CP-response is successful in identifying the bridge frequency and changes caused by damage, without being influenced by the vehicle frequencies. Incorporating the CP-response into drive-by bridge monitoring will improve accuracy over existing methods which use the vehicle response alone.
{"title":"Examining changes in bridge frequency due to damage using the contact-point response of a passing vehicle","authors":"R. Corbally, A. Malekjafarian","doi":"10.1080/24705314.2021.1906088","DOIUrl":"https://doi.org/10.1080/24705314.2021.1906088","url":null,"abstract":"ABSTRACT Ongoing inspection and maintenance of bridges poses a challenging task for infrastructure owners who must manage large bridge stocks with limited budgets. Drive-by monitoring approaches, using sensors in a vehicle, provide a promising solution to this challenge. This paper investigates the use of the response at the point-of-contact between the tyre and the bridge as a means of monitoring bridge frequency. An expression is derived to allow the contact-point (CP) response to be inferred directly from in-vehicle measurements, expanding on previous studies by allowing the vehicle suspension characteristics to be considered. The sensitivity of the CP-response to the pavement characteristics is investigated in detail and a rigid-disk model is used to overcome issues with how existing vehicle-bridge interaction models consider the interaction between the wheel and the pavement. The feasibility of the CP-response as a measure of bridge condition is investigated and results show that the CP-response significantly outperforms the response measured directly on the vehicle. The CP-response is successful in identifying the bridge frequency and changes caused by damage, without being influenced by the vehicle frequencies. Incorporating the CP-response into drive-by bridge monitoring will improve accuracy over existing methods which use the vehicle response alone.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"148 - 158"},"PeriodicalIF":2.1,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2021.1906088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44055081","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}
Pub Date : 2021-07-03DOI: 10.1080/24705314.2021.1906089
J. Lipczynska, R. West, M. Grimes, D. Niall, O. Kinnane, R. O’hegarty
ABSTRACT The traditional means of using precast concrete sandwich panels are restrictive in terms of applications, where thick wythes result in heavy panels which are often unsuitable in retrofitting domestic and commercial buildings. As concrete sandwich panel technology has evolved to make it more widely accessible, recent research work has demonstrated that it is possible to achieve thermally efficient partial composite action within a thin wythe panel provided non-conductive shear connectors are used. This paper examines high performance recycled aggregate concrete in heavily insulated non-load-bearing panels for retrofitting domestic and commercial buildings. A series of concrete mixes were tested to develop one which would be more sustainable than the widely accepted standard mixes for wythes. Different 220 mm thick concrete sandwich panels were tested consisting of 20 mm thick fibre-reinforced recycled aggregate concrete wythes and a 180 mm layer of XPS insulation. Unconnected and shear connected panels were tested in flexure in a displacement control test. The effects of composite action and post-cracking toughness were examined and it was concluded that a shear connected panel comprising sustainable thin recycled aggregate concrete wythes enclosing a thick layer of insulation is a feasible product to use for light high-performance sandwich panels.
{"title":"Composite behaviour of wide sandwich panels with thin high performance recycled aggregate concrete wythes with fibre reinforced polymer shear connectors","authors":"J. Lipczynska, R. West, M. Grimes, D. Niall, O. Kinnane, R. O’hegarty","doi":"10.1080/24705314.2021.1906089","DOIUrl":"https://doi.org/10.1080/24705314.2021.1906089","url":null,"abstract":"ABSTRACT The traditional means of using precast concrete sandwich panels are restrictive in terms of applications, where thick wythes result in heavy panels which are often unsuitable in retrofitting domestic and commercial buildings. As concrete sandwich panel technology has evolved to make it more widely accessible, recent research work has demonstrated that it is possible to achieve thermally efficient partial composite action within a thin wythe panel provided non-conductive shear connectors are used. This paper examines high performance recycled aggregate concrete in heavily insulated non-load-bearing panels for retrofitting domestic and commercial buildings. A series of concrete mixes were tested to develop one which would be more sustainable than the widely accepted standard mixes for wythes. Different 220 mm thick concrete sandwich panels were tested consisting of 20 mm thick fibre-reinforced recycled aggregate concrete wythes and a 180 mm layer of XPS insulation. Unconnected and shear connected panels were tested in flexure in a displacement control test. The effects of composite action and post-cracking toughness were examined and it was concluded that a shear connected panel comprising sustainable thin recycled aggregate concrete wythes enclosing a thick layer of insulation is a feasible product to use for light high-performance sandwich panels.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"187 - 196"},"PeriodicalIF":2.1,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2021.1906089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48229941","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}
Pub Date : 2021-07-03DOI: 10.1080/24705314.2021.1906091
W. Finnegan, M. Flanagan, Rónán Ó Coistealbha, Priya Dasan Keeryadath, P. Meier, Le Chi Hung, T. Flanagan, J. Goggins
ABSTRACT Over the past 30 years, wind energy has been established as one of the leading forms of renewable energy. As the industry grows so too does the size of the wind turbines themselves – large wind turbines can now generate up to 15 MW. However, with larger turbines comes additional structural challenges to overcome, where one such challenge is erosion along the leading edge of the blade due to water impingement at the higher tip speeds of the blade. Therefore, in this paper, the development of a novel solution for preventing leading edge erosion on wind turbine blades (LEP) is presented. Primarily, this paper describes the experimental testing campaigns that were performed during LEP development. Based on the results from the rain erosion testing of selected materials, their manufacturability and other mechanical properties, thermoplastic polyurethane has been selected as the most suitable material to manufacture the LEP. The LEP component was de-risked through demonstrator testing and then bonded to the leading edge of a full-scale wind turbine blade. Structural (dynamic, static and fatigue mechanical) testing was performed on the blade with no significant damage observed. The next stage of development is operational trials on a wind turbine in marine conditions.
{"title":"A novel solution for preventing leading edge erosion in wind turbine blades","authors":"W. Finnegan, M. Flanagan, Rónán Ó Coistealbha, Priya Dasan Keeryadath, P. Meier, Le Chi Hung, T. Flanagan, J. Goggins","doi":"10.1080/24705314.2021.1906091","DOIUrl":"https://doi.org/10.1080/24705314.2021.1906091","url":null,"abstract":"ABSTRACT Over the past 30 years, wind energy has been established as one of the leading forms of renewable energy. As the industry grows so too does the size of the wind turbines themselves – large wind turbines can now generate up to 15 MW. However, with larger turbines comes additional structural challenges to overcome, where one such challenge is erosion along the leading edge of the blade due to water impingement at the higher tip speeds of the blade. Therefore, in this paper, the development of a novel solution for preventing leading edge erosion on wind turbine blades (LEP) is presented. Primarily, this paper describes the experimental testing campaigns that were performed during LEP development. Based on the results from the rain erosion testing of selected materials, their manufacturability and other mechanical properties, thermoplastic polyurethane has been selected as the most suitable material to manufacture the LEP. The LEP component was de-risked through demonstrator testing and then bonded to the leading edge of a full-scale wind turbine blade. Structural (dynamic, static and fatigue mechanical) testing was performed on the blade with no significant damage observed. The next stage of development is operational trials on a wind turbine in marine conditions.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"136 - 147"},"PeriodicalIF":2.1,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2021.1906091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47232185","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}
Pub Date : 2021-06-07DOI: 10.1080/24705314.2021.1906090
Michael Conway, Sameer Mehra, A. Harte, C. O’Ceallaigh
ABSTRACT An investigation was carried out to examine the potential to utilise densified wood dowels as a reinforcement for timber subjected to compression loading perpendicular to the grain. While timber has a high strength-to-weight ratio parallel to the grain, it demonstrates poor strength perpendicular to the grain and in recent years there has been a significant number of studies examining the use of steel screws and bonded-in rods as reinforcement in this area. This is becoming more and more important with the increased use of timber in medium-to-high rise structures. In this study, thermo-mechanical densified wood in the form of dowels are utilised as compression reinforcement perpendicular to the grain and tested to failure. Thermo-mechanically densified dowel reinforcement arrangements of 2, 4, and 6 dowels are examined experimentally under a compressive load and compared to timber samples similarly reinforced but with steel self-tapping screws. The results have demonstrated the potential to utilised densified wood to create an all-wood solution to reinforce against compressive stresses perpendicular to the grain. Additionally, modifications to recently proposed Eurocode 5 recommendations for the design of compression reinforcement using self-tapping steel screws are presented, which are suitable for the design of compression reinforcement using densified wood dowels.
{"title":"Densified wood dowel reinforcement of timber perpendicular to the grain: a pilot study","authors":"Michael Conway, Sameer Mehra, A. Harte, C. O’Ceallaigh","doi":"10.1080/24705314.2021.1906090","DOIUrl":"https://doi.org/10.1080/24705314.2021.1906090","url":null,"abstract":"ABSTRACT An investigation was carried out to examine the potential to utilise densified wood dowels as a reinforcement for timber subjected to compression loading perpendicular to the grain. While timber has a high strength-to-weight ratio parallel to the grain, it demonstrates poor strength perpendicular to the grain and in recent years there has been a significant number of studies examining the use of steel screws and bonded-in rods as reinforcement in this area. This is becoming more and more important with the increased use of timber in medium-to-high rise structures. In this study, thermo-mechanical densified wood in the form of dowels are utilised as compression reinforcement perpendicular to the grain and tested to failure. Thermo-mechanically densified dowel reinforcement arrangements of 2, 4, and 6 dowels are examined experimentally under a compressive load and compared to timber samples similarly reinforced but with steel self-tapping screws. The results have demonstrated the potential to utilised densified wood to create an all-wood solution to reinforce against compressive stresses perpendicular to the grain. Additionally, modifications to recently proposed Eurocode 5 recommendations for the design of compression reinforcement using self-tapping steel screws are presented, which are suitable for the design of compression reinforcement using densified wood dowels.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"177 - 186"},"PeriodicalIF":2.1,"publicationDate":"2021-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2021.1906090","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43270462","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}
Pub Date : 2021-04-03DOI: 10.1080/24705314.2020.1862963
Hopeful Syiemiong, C. Marthong
ABSTRACT Masonry construction is the leading construction method for building constructions worldwide. Despite their relatively poor seismic performance, masonry buildings have widespread appeal owing to their low construction costs and ease of construction especially in rural and semi-urban centres of developing countries like India. In the recent past, however, innovative techniques in masonry constructions have significantly improved the seismic behaviour of low and medium rise masonry buildings and have satisfactorily performed under strong earthquake ground shaking. This paper critically summarizes the different seismically-improved construction methods for clay-brick and concrete-block ordinary masonry buildings adopted worldwide. While the same method may be applied in different regions of the world, the use of different types of masonry units, however, do not necessarily yield the same results. For regions where the first use of a seismically-improved construction method is contemplated, there is a need to further investigate the efficacy of any method with the locally available materials of the region for economic feasibility and social acceptance of the proposed method.
{"title":"A review on improved construction methods for clay-brick and concrete-block ordinary masonry buildings","authors":"Hopeful Syiemiong, C. Marthong","doi":"10.1080/24705314.2020.1862963","DOIUrl":"https://doi.org/10.1080/24705314.2020.1862963","url":null,"abstract":"ABSTRACT Masonry construction is the leading construction method for building constructions worldwide. Despite their relatively poor seismic performance, masonry buildings have widespread appeal owing to their low construction costs and ease of construction especially in rural and semi-urban centres of developing countries like India. In the recent past, however, innovative techniques in masonry constructions have significantly improved the seismic behaviour of low and medium rise masonry buildings and have satisfactorily performed under strong earthquake ground shaking. This paper critically summarizes the different seismically-improved construction methods for clay-brick and concrete-block ordinary masonry buildings adopted worldwide. While the same method may be applied in different regions of the world, the use of different types of masonry units, however, do not necessarily yield the same results. For regions where the first use of a seismically-improved construction method is contemplated, there is a need to further investigate the efficacy of any method with the locally available materials of the region for economic feasibility and social acceptance of the proposed method.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"67 - 83"},"PeriodicalIF":2.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1862963","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48618465","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}
Pub Date : 2021-04-03DOI: 10.1080/24705314.2020.1862964
O. Corbi, F. Tropeano, I. Corbi, H. Li, Eugenio Liccardo
ABSTRACT This paper is focused on the analysis of an Italian monumental masonry arch bridge in the Campania Region. Starting from a historical survey, the main features of the bridge are recognized, concerning its geometry, materials, and mechanical parameters. Therefore, a 3D model is developed based on these data. The procedure is characterized by two phases aimed at identifying the suitable mesh and selecting the substructures then reassembled together to obtain the entire bridge. The FEM analysis of the structural model shows results in terms of stresses and deformed shapes, emphasizing the global response of the bridge and the contribution of any, both structural and non-structural, component.
{"title":"Structural analysis of historical infrastructures: the case of the bridge on the Furore Fiord","authors":"O. Corbi, F. Tropeano, I. Corbi, H. Li, Eugenio Liccardo","doi":"10.1080/24705314.2020.1862964","DOIUrl":"https://doi.org/10.1080/24705314.2020.1862964","url":null,"abstract":"ABSTRACT This paper is focused on the analysis of an Italian monumental masonry arch bridge in the Campania Region. Starting from a historical survey, the main features of the bridge are recognized, concerning its geometry, materials, and mechanical parameters. Therefore, a 3D model is developed based on these data. The procedure is characterized by two phases aimed at identifying the suitable mesh and selecting the substructures then reassembled together to obtain the entire bridge. The FEM analysis of the structural model shows results in terms of stresses and deformed shapes, emphasizing the global response of the bridge and the contribution of any, both structural and non-structural, component.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"84 - 90"},"PeriodicalIF":2.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1862964","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47714993","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}
Pub Date : 2021-04-03DOI: 10.1080/24705314.2020.1862969
Muyideen Abdulkareem, N. Bakhary, A. Ganiyu, O. Nathaniel, Taha M. Jassam, R. Al-Mansob
ABSTRACT The effectiveness of vibration-based damage detection (VBDD) method has been demonstrated by researchers to provide reliable results. However, the existence of uncertainties in measurement and modelling data hinders the accuracy of results obtained from VBDD. Researches have yielded favourable results by integrating probabilistic method. Despite these successes, the probabilistic method faces the problem of obtaining an unbiased probabilistic distribution of uncertainties. Furthermore, the probabilistic method involves long and complex computations. In dealing with these problems, the nonprobabilistic method that requires no assumptions of the uncertainties distribution was proposed. It involves estimating only the upper and lower bounds of the uncertain parameter. However, the success of the nonprobabilistic method is shortened by its reliance on baseline (undamaged) data that is often not available for existing structures. In this study, a nonprobabilistic interval analysis wavelet (NIAW) method to consider uncertainties in damage identification without using baseline healthy data is proposed. The proposed method is demonstrated by using a plate structure and applying the symmetrical properties of the plate structure. The wavelet coefficient of the plate mode shape is divided along the line of symmetry to obtain wavelet coefficients WL and WR , and the bounds (upper and lower) of WL and WR are estimated. The PoDE and wavelet coefficient increment factor (WCIF) are estimated to obtain damage identity by using the bounds of WL and WR . The product of PoDE and WCIF provides the value of DMI which indicates the level of damage severity. This method is demonstrated using numerical models of a steel plate. The results show that the proposed method accurately identifies damage when noise-contaminated mode shape data is applied.
{"title":"Consideration of uncertainty in damage detection using interval analysis wavelet without baseline data","authors":"Muyideen Abdulkareem, N. Bakhary, A. Ganiyu, O. Nathaniel, Taha M. Jassam, R. Al-Mansob","doi":"10.1080/24705314.2020.1862969","DOIUrl":"https://doi.org/10.1080/24705314.2020.1862969","url":null,"abstract":"ABSTRACT The effectiveness of vibration-based damage detection (VBDD) method has been demonstrated by researchers to provide reliable results. However, the existence of uncertainties in measurement and modelling data hinders the accuracy of results obtained from VBDD. Researches have yielded favourable results by integrating probabilistic method. Despite these successes, the probabilistic method faces the problem of obtaining an unbiased probabilistic distribution of uncertainties. Furthermore, the probabilistic method involves long and complex computations. In dealing with these problems, the nonprobabilistic method that requires no assumptions of the uncertainties distribution was proposed. It involves estimating only the upper and lower bounds of the uncertain parameter. However, the success of the nonprobabilistic method is shortened by its reliance on baseline (undamaged) data that is often not available for existing structures. In this study, a nonprobabilistic interval analysis wavelet (NIAW) method to consider uncertainties in damage identification without using baseline healthy data is proposed. The proposed method is demonstrated by using a plate structure and applying the symmetrical properties of the plate structure. The wavelet coefficient of the plate mode shape is divided along the line of symmetry to obtain wavelet coefficients WL and WR , and the bounds (upper and lower) of WL and WR are estimated. The PoDE and wavelet coefficient increment factor (WCIF) are estimated to obtain damage identity by using the bounds of WL and WR . The product of PoDE and WCIF provides the value of DMI which indicates the level of damage severity. This method is demonstrated using numerical models of a steel plate. The results show that the proposed method accurately identifies damage when noise-contaminated mode shape data is applied.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"99 - 109"},"PeriodicalIF":2.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1862969","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46553072","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}
Pub Date : 2021-04-03DOI: 10.1080/24705314.2020.1865624
Muhammad Waleed Khan, M. Usman, S. Farooq, Muhammad Zain, S. Saleem
ABSTRACT This study aims at determining the effect of masonry as an infill on the vulnerability of reinforced concrete frame buildings by using fragility assessment. Refined linear and nonlinear structural models were developed, from data collected through professional surveys, using the PERFORM-3D platform. Nonlinear – static and dynamic – analyses were carried out, for fifteen ground motions, to examine the plastic behavior of the models. Subsequently, the vulnerability was assessed using fragility relationships. The fragility parameters were determined by employing the Maximum Likelihood Method (MLM). The results indicated a decrease in the probability of exceedance for specific damage states of the structures with respect to seismic intensity for masonry infill frames. From fragility curves, it is concluded that although the use of masonry as an infill temporarily enhances the capacity of Reinforced Concrete (RC) Frame buildings as the probability of exceedance for masonry infilled RC frames is significantly reduced due to the increase in the overall stiffness of the structure.
{"title":"Effect of masonry infill on analytical fragility response of RC frame school buildings in high seismic zone","authors":"Muhammad Waleed Khan, M. Usman, S. Farooq, Muhammad Zain, S. Saleem","doi":"10.1080/24705314.2020.1865624","DOIUrl":"https://doi.org/10.1080/24705314.2020.1865624","url":null,"abstract":"ABSTRACT This study aims at determining the effect of masonry as an infill on the vulnerability of reinforced concrete frame buildings by using fragility assessment. Refined linear and nonlinear structural models were developed, from data collected through professional surveys, using the PERFORM-3D platform. Nonlinear – static and dynamic – analyses were carried out, for fifteen ground motions, to examine the plastic behavior of the models. Subsequently, the vulnerability was assessed using fragility relationships. The fragility parameters were determined by employing the Maximum Likelihood Method (MLM). The results indicated a decrease in the probability of exceedance for specific damage states of the structures with respect to seismic intensity for masonry infill frames. From fragility curves, it is concluded that although the use of masonry as an infill temporarily enhances the capacity of Reinforced Concrete (RC) Frame buildings as the probability of exceedance for masonry infilled RC frames is significantly reduced due to the increase in the overall stiffness of the structure.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"110 - 122"},"PeriodicalIF":2.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1865624","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42936009","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：