Pub Date : 2020-07-02DOI: 10.1080/24705314.2020.1765267
G. Wheatley
ABSTRACT The following paper provides a summary of the design and operating parameters for the Dynamic Belt Clamp. The Dynamic Clamp is hydraulically controlled to apply braking force on a belt via reference from an operator input. Belt braking force is proportional to hydraulic pressure applied. The clamp is not designed to be “fail safe” with the clamp opening when hydraulic system pressure is lost. Hand calculations were used along with finite element analysis to determine the structural stresses induced by the combined clamping force and belt tension. A 20 Metric Tonne belt tension capacity (196.1 kN lateral load) has been nominated for design purposes. A belt thickness of 50 mm has been assumed as a worst case for design purposes. In addition, a dynamic coefficient of friction of 0.2 has been assumed for the contact surfaces between the belt and the clamping beam surfaces. Australian Standard AS1418.1 – Cranes, Hoists and Winches General and AS3990 Mechanical Equipment – Steelwork have been utilized for determining the suitability of the design. The design meets the requirements of the standards for the proposed clamping loads and belt tensions. The combined stresses do not exceed allowable stress or displacement recommendations.
{"title":"Design of a hydraulically controlled conveyor belt clamp for heavy-duty drift belt installation in underground applications: a case study","authors":"G. Wheatley","doi":"10.1080/24705314.2020.1765267","DOIUrl":"https://doi.org/10.1080/24705314.2020.1765267","url":null,"abstract":"ABSTRACT The following paper provides a summary of the design and operating parameters for the Dynamic Belt Clamp. The Dynamic Clamp is hydraulically controlled to apply braking force on a belt via reference from an operator input. Belt braking force is proportional to hydraulic pressure applied. The clamp is not designed to be “fail safe” with the clamp opening when hydraulic system pressure is lost. Hand calculations were used along with finite element analysis to determine the structural stresses induced by the combined clamping force and belt tension. A 20 Metric Tonne belt tension capacity (196.1 kN lateral load) has been nominated for design purposes. A belt thickness of 50 mm has been assumed as a worst case for design purposes. In addition, a dynamic coefficient of friction of 0.2 has been assumed for the contact surfaces between the belt and the clamping beam surfaces. Australian Standard AS1418.1 – Cranes, Hoists and Winches General and AS3990 Mechanical Equipment – Steelwork have been utilized for determining the suitability of the design. The design meets the requirements of the standards for the proposed clamping loads and belt tensions. The combined stresses do not exceed allowable stress or displacement recommendations.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1765267","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42490791","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 : 2020-07-02DOI: 10.1080/24705314.2020.1765270
S. Memon, Muhammad Zain, Dichuan Zhang, Sardar Kashif Ur Rehman, M. Usman, Deuckhang Lee
ABSTRACT Tall buildings are being built for more than a century now, but there has been an exponential growth in the development of convoluted tall buildings with distinctive architecture. A tall building with a unique structural form, brings forth admonishing challenges for the structural designers to deal with. Such a contemporary inclination towards the fabrication of free-form structures has posed enormous challenges to the modern-day structural engineering community, and consequently, has faced reactions in the form of tremendous researches pertaining to complex building specific issues. This paper extensively reviews six case studies of recent tall buildings that possess a challenging architecture with tortuous structural features to cope with the gravity and lateral loadings. Six representative tall buildings have been chosen from all over the world, which have distinctive features in terms of their structural systems. This paper discusses the fundamental characteristics of these tall buildings in the world and presents the challenges faced during the modelling, analysis, design, and construction of these skyscrapers, along with the brief of methodologies which were eventually adopted to cope with these challenges.
{"title":"Emerging trends in the growth of structural systems for tall buildings","authors":"S. Memon, Muhammad Zain, Dichuan Zhang, Sardar Kashif Ur Rehman, M. Usman, Deuckhang Lee","doi":"10.1080/24705314.2020.1765270","DOIUrl":"https://doi.org/10.1080/24705314.2020.1765270","url":null,"abstract":"ABSTRACT Tall buildings are being built for more than a century now, but there has been an exponential growth in the development of convoluted tall buildings with distinctive architecture. A tall building with a unique structural form, brings forth admonishing challenges for the structural designers to deal with. Such a contemporary inclination towards the fabrication of free-form structures has posed enormous challenges to the modern-day structural engineering community, and consequently, has faced reactions in the form of tremendous researches pertaining to complex building specific issues. This paper extensively reviews six case studies of recent tall buildings that possess a challenging architecture with tortuous structural features to cope with the gravity and lateral loadings. Six representative tall buildings have been chosen from all over the world, which have distinctive features in terms of their structural systems. This paper discusses the fundamental characteristics of these tall buildings in the world and presents the challenges faced during the modelling, analysis, design, and construction of these skyscrapers, along with the brief of methodologies which were eventually adopted to cope with these challenges.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1765270","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47070698","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 : 2020-07-02DOI: 10.1080/24705314.2020.1765271
A. Danish, Faran Tayyab, M. U. Salim
ABSTRACT The uses of dynamic estimations on existing structures are numerous: evaluation of their seismic vulnerability, structure’s abilities in post-quake circumstances or after changes in the region, and so on. At present, this sort of estimation enables auxiliary conclusion on a global scale, while the identification and the assessment of local damage (each element of the structure) needs to be investigated. Additionally, we begin to co-exist and interact with smart interconnected devices known as the Internet of Things (IoT). The IoT brought new opportunities for our society. Yet, most of the existing Structural Health Monitoring (SHM) systems are not connected to the IoT. Hence, this article studies the integration of complete real-time SHM platform with the Iot system, which can provide structural health of a structure and the performance of this sensor was check on a reinforced concrete (RC) beam. The RC beam was loaded in the central part in several stages corresponding to different damage states. Displacements were measured simultaneously using displacement sensors. After each load/unload cycle, dynamic measurements were taken using accelerometers. The perceptions from investigation were displayed, with the presence of damage and the reduction in natural frequencies that occurred in conjunction with reduction in stiffness.
{"title":"Health assessment based on dynamic characteristics of reinforced concrete beam using realtime wireless structural health monitoring sensor","authors":"A. Danish, Faran Tayyab, M. U. Salim","doi":"10.1080/24705314.2020.1765271","DOIUrl":"https://doi.org/10.1080/24705314.2020.1765271","url":null,"abstract":"ABSTRACT The uses of dynamic estimations on existing structures are numerous: evaluation of their seismic vulnerability, structure’s abilities in post-quake circumstances or after changes in the region, and so on. At present, this sort of estimation enables auxiliary conclusion on a global scale, while the identification and the assessment of local damage (each element of the structure) needs to be investigated. Additionally, we begin to co-exist and interact with smart interconnected devices known as the Internet of Things (IoT). The IoT brought new opportunities for our society. Yet, most of the existing Structural Health Monitoring (SHM) systems are not connected to the IoT. Hence, this article studies the integration of complete real-time SHM platform with the Iot system, which can provide structural health of a structure and the performance of this sensor was check on a reinforced concrete (RC) beam. The RC beam was loaded in the central part in several stages corresponding to different damage states. Displacements were measured simultaneously using displacement sensors. After each load/unload cycle, dynamic measurements were taken using accelerometers. The perceptions from investigation were displayed, with the presence of damage and the reduction in natural frequencies that occurred in conjunction with reduction in stiffness.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1765271","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41531459","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 : 2020-07-02DOI: 10.1080/24705314.2020.1765269
Rahul Biswas, B. Rai
ABSTRACT Silica fume is a recognized pozzolan which can contribute unique properties to Portland cement products. The use of silica fume in cement and concrete technology has unexpectedly increased over the most recent couple of years with the advent of high-performance concrete. All the previous researches in estimating the cementing efficiency factor of silica fume have been built on the strength prediction of concrete at different w/c ratio for different percentage replacement of silica fume. In the present work, the cementing efficiency factor for silica fume at different percentage replacement level has been assumed, and at the constant water to binder ratio, the compressive strength has been obtained. Further, the results of 28-day compressive strengths of silica fume concrete have been examined using a response surface model and a relationship has been projected. This model, which relates compressive strength with water to binder ratio, cementing efficiency factor and percentage silica fume, might find a useful application in the strength prediction of silica fume concretes.
{"title":"Effect of cementing efficiency factor on the mechanical properties of concrete incorporating silica fume","authors":"Rahul Biswas, B. Rai","doi":"10.1080/24705314.2020.1765269","DOIUrl":"https://doi.org/10.1080/24705314.2020.1765269","url":null,"abstract":"ABSTRACT Silica fume is a recognized pozzolan which can contribute unique properties to Portland cement products. The use of silica fume in cement and concrete technology has unexpectedly increased over the most recent couple of years with the advent of high-performance concrete. All the previous researches in estimating the cementing efficiency factor of silica fume have been built on the strength prediction of concrete at different w/c ratio for different percentage replacement of silica fume. In the present work, the cementing efficiency factor for silica fume at different percentage replacement level has been assumed, and at the constant water to binder ratio, the compressive strength has been obtained. Further, the results of 28-day compressive strengths of silica fume concrete have been examined using a response surface model and a relationship has been projected. This model, which relates compressive strength with water to binder ratio, cementing efficiency factor and percentage silica fume, might find a useful application in the strength prediction of silica fume concretes.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1765269","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48737758","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 : 2020-04-02DOI: 10.1080/24705314.2020.1746013
S. Miraglia
ABSTRACT The correct functioning of well completion in oil and gas facilities is eminently important to assure continuity of production operations together with an adequate safety level. To enhance the performance of production wells and reduce maintenance expenditures, a paradigm shift from corrective maintenance to proactive risk based maintenance is necessary. The feasibility of fully probabilistic risk-based inspection planning approach for oil wells has been investigated as pilot study carried out at Danish Hydrocarbon Research and Technology Centre (DHRTC). After establishing a baseline for the system taxonomy, failure modes and their dependencies on deterioration mechanisms, a data collection and analysis lead to the calibration of a corrosion probabilistic model, based on pit size measured from tubing inspections. This manuscript presents the results of the feasibility study, the calibration of a bespoke corrosion model for wells in the Danish sector of North Sea, the reliability analysis and the identification of a threshold value for the pit penetration to be compared with current oil & gas (O&G) regulations. The model is further used to compare expected maintenance costs for corrective maintenance and condition-based maintenance. Results show how the condition-based maintenance policy results in lower maintenance costs and potential extension of well lifetime.
{"title":"A data-driven probabilistic model for well integrity management: case study and model calibration for the Danish sector of North Sea","authors":"S. Miraglia","doi":"10.1080/24705314.2020.1746013","DOIUrl":"https://doi.org/10.1080/24705314.2020.1746013","url":null,"abstract":"ABSTRACT The correct functioning of well completion in oil and gas facilities is eminently important to assure continuity of production operations together with an adequate safety level. To enhance the performance of production wells and reduce maintenance expenditures, a paradigm shift from corrective maintenance to proactive risk based maintenance is necessary. The feasibility of fully probabilistic risk-based inspection planning approach for oil wells has been investigated as pilot study carried out at Danish Hydrocarbon Research and Technology Centre (DHRTC). After establishing a baseline for the system taxonomy, failure modes and their dependencies on deterioration mechanisms, a data collection and analysis lead to the calibration of a corrosion probabilistic model, based on pit size measured from tubing inspections. This manuscript presents the results of the feasibility study, the calibration of a bespoke corrosion model for wells in the Danish sector of North Sea, the reliability analysis and the identification of a threshold value for the pit penetration to be compared with current oil & gas (O&G) regulations. The model is further used to compare expected maintenance costs for corrective maintenance and condition-based maintenance. Results show how the condition-based maintenance policy results in lower maintenance costs and potential extension of well lifetime.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1746013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47096545","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 : 2020-04-02DOI: 10.1080/24705314.2020.1729518
Yung-Chiang Lin, C. Chiang, Chih-Peng Yu, K. Hsu
ABSTRACT The amount of built wind resource has greatly increased since wind turbines have started to get installed offshore in order to power much of the world. Topics relating to wind turbine have encouraged researchers to put in greater efforts towards developing modeling methodologies, analytical theories, assessment techniques. Through the establishment of certain models and new findings, potential ideas regarding structural health monitoring and non-destructive evaluations may be proposed and worthy of exploration. Based on the spectral formulation of a Timoshenko member with the consideration of soil–structure interaction, the simulated model of a wind turbine was investigated in this work in order to quantify the various effects due to defects as well as foundation stiffness on the dynamic responses of the tower. This paper focuses on the analysis of the tower structure using the modal curvature data of the first vibration mode. Preliminary results show that the curvature index defined in the proposed method is capable of indicating not only the damaged region of the tower, but also the degree of stiffness softening that the foundation system may have encountered. The presented methodology demonstrates potential as a feasible analysis method to be applied in a vibration-based assessment scheme for the wind turbine tower.
{"title":"Deterministic deterioration modeling of wind turbines toward the failure identification – a modal curvature approach","authors":"Yung-Chiang Lin, C. Chiang, Chih-Peng Yu, K. Hsu","doi":"10.1080/24705314.2020.1729518","DOIUrl":"https://doi.org/10.1080/24705314.2020.1729518","url":null,"abstract":"ABSTRACT The amount of built wind resource has greatly increased since wind turbines have started to get installed offshore in order to power much of the world. Topics relating to wind turbine have encouraged researchers to put in greater efforts towards developing modeling methodologies, analytical theories, assessment techniques. Through the establishment of certain models and new findings, potential ideas regarding structural health monitoring and non-destructive evaluations may be proposed and worthy of exploration. Based on the spectral formulation of a Timoshenko member with the consideration of soil–structure interaction, the simulated model of a wind turbine was investigated in this work in order to quantify the various effects due to defects as well as foundation stiffness on the dynamic responses of the tower. This paper focuses on the analysis of the tower structure using the modal curvature data of the first vibration mode. Preliminary results show that the curvature index defined in the proposed method is capable of indicating not only the damaged region of the tower, but also the degree of stiffness softening that the foundation system may have encountered. The presented methodology demonstrates potential as a feasible analysis method to be applied in a vibration-based assessment scheme for the wind turbine tower.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1729518","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42261774","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 : 2020-04-02DOI: 10.1080/24705314.2020.1729517
Salisu El-Hussein, J. Harrigan, A. Starkey
ABSTRACT The use of low frequency (less than 10 kHz) guided waves for structural health monitoring (SHM) against third party intrusion into long pipelines is investigated. A guided wave (GW) is sent along a pipeline and its reflection is used to detect the presence of a drilled hole or a branch connected to the pipeline. Finite element (FE) analysis was conducted on 305 mm (12 inch) outside diameter, 12 mm wall thickness mild steel pipe. The effects of pipe diameter and thickness on the GW propagation characteristics are illustrated. It is shown that the use of low frequencies have a lower attenuation and therefore are suitable for long range propagation. It is shown that GWs have the potential to detect holes over 100s of meters of pipeline
{"title":"Long range guided waves for detecting holes in pipelines","authors":"Salisu El-Hussein, J. Harrigan, A. Starkey","doi":"10.1080/24705314.2020.1729517","DOIUrl":"https://doi.org/10.1080/24705314.2020.1729517","url":null,"abstract":"ABSTRACT The use of low frequency (less than 10 kHz) guided waves for structural health monitoring (SHM) against third party intrusion into long pipelines is investigated. A guided wave (GW) is sent along a pipeline and its reflection is used to detect the presence of a drilled hole or a branch connected to the pipeline. Finite element (FE) analysis was conducted on 305 mm (12 inch) outside diameter, 12 mm wall thickness mild steel pipe. The effects of pipe diameter and thickness on the GW propagation characteristics are illustrated. It is shown that the use of low frequencies have a lower attenuation and therefore are suitable for long range propagation. It is shown that GWs have the potential to detect holes over 100s of meters of pipeline","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1729517","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42467949","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 : 2020-04-02DOI: 10.1080/24705314.2020.1729520
Panagiotis Anastasiadis, E. Theotokoglou, C. Michailides
ABSTRACT The present paper examines the case of a metal based unbonded flexible pipe under a number of axial tensile operational loads of varying intensity, expressly focusing on the response of the segments of the pipe’s tensile armour wires that lie inside the pipe’s End-Fitting (EF), with intent to track the development of high stress concentration areas there and assess the stress concentration factors (SCF) involved. Additionally, a parametric study is performed, to identify potential factors that might affect the maximum SCF values measured on these wire segments inside the EF. Based on the parametric study’s findings, an approximate relationship for evaluating the expected maximum SCF on the tensile wire inside the EF is developed. The paper adopts a numerical approach to the problem, based on the development of a two-dimensional finite element model for evaluating the wire’s response to axial tensile operational loads. The model considers both the effects the EF’s assembling procedure and the Factory Acceptance Test (FAT) have on the behavior of wire segments lying inside the EF. An analytical approach is employed as a benchmarking tool of the numerical model’s performance.
{"title":"Numerical analysis of stress concentration factors on tensile armour wires inside the end-fitting of an axially tensed unbonded flexible pipe","authors":"Panagiotis Anastasiadis, E. Theotokoglou, C. Michailides","doi":"10.1080/24705314.2020.1729520","DOIUrl":"https://doi.org/10.1080/24705314.2020.1729520","url":null,"abstract":"ABSTRACT The present paper examines the case of a metal based unbonded flexible pipe under a number of axial tensile operational loads of varying intensity, expressly focusing on the response of the segments of the pipe’s tensile armour wires that lie inside the pipe’s End-Fitting (EF), with intent to track the development of high stress concentration areas there and assess the stress concentration factors (SCF) involved. Additionally, a parametric study is performed, to identify potential factors that might affect the maximum SCF values measured on these wire segments inside the EF. Based on the parametric study’s findings, an approximate relationship for evaluating the expected maximum SCF on the tensile wire inside the EF is developed. The paper adopts a numerical approach to the problem, based on the development of a two-dimensional finite element model for evaluating the wire’s response to axial tensile operational loads. The model considers both the effects the EF’s assembling procedure and the Factory Acceptance Test (FAT) have on the behavior of wire segments lying inside the EF. An analytical approach is employed as a benchmarking tool of the numerical model’s performance.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1729520","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47286535","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 : 2020-04-02DOI: 10.1080/24705314.2020.1747194
P. Omenzetter
This special issue on “Structural Integrity of Offshore Energy Industry“ originated at the 1 International Conference on Structural Integrity of Offshore Energy Industry held in September 2018 in Aberdeen, Scotland. The offshore, marine, and subsea energy industries continue to evolve creating new challenges and risks for the integrity, safety and reliability of its structures and systems. There is a push to expand operations into new locations and environments, such as greater depths, where operational conditions are considerably harsher. Many assets in mature fields are rapidly reaching or have already exceeded their original design life and safe but affordable life extension and decommissioning are becoming major objectives. The recent rapid developments in renewable energy technologies have introduced new challenges for maintaining at minimum cost the reliability and integrity of structures and equipment in remote locations. There are also exciting new opportunities, but also significant challenges and uncertainties, in applying structural health monitoring and non-destructive testing and the novel concepts of data science to safety and structural integrity. This special issue brings papers authored by international researchers that discuss and address the current and emerging issues and challenges, including modelling of deterioration of wind turbines, strengthening composite wind turbine blades with nanotubes, detecting damage in pipelines, calculating stress concentration in armoured flexible pipes, and applying the theory of value of information and data driven approaches to structural integrity management.
{"title":"Introduction","authors":"P. Omenzetter","doi":"10.1080/24705314.2020.1747194","DOIUrl":"https://doi.org/10.1080/24705314.2020.1747194","url":null,"abstract":"This special issue on “Structural Integrity of Offshore Energy Industry“ originated at the 1 International Conference on Structural Integrity of Offshore Energy Industry held in September 2018 in Aberdeen, Scotland. The offshore, marine, and subsea energy industries continue to evolve creating new challenges and risks for the integrity, safety and reliability of its structures and systems. There is a push to expand operations into new locations and environments, such as greater depths, where operational conditions are considerably harsher. Many assets in mature fields are rapidly reaching or have already exceeded their original design life and safe but affordable life extension and decommissioning are becoming major objectives. The recent rapid developments in renewable energy technologies have introduced new challenges for maintaining at minimum cost the reliability and integrity of structures and equipment in remote locations. There are also exciting new opportunities, but also significant challenges and uncertainties, in applying structural health monitoring and non-destructive testing and the novel concepts of data science to safety and structural integrity. This special issue brings papers authored by international researchers that discuss and address the current and emerging issues and challenges, including modelling of deterioration of wind turbines, strengthening composite wind turbine blades with nanotubes, detecting damage in pipelines, calculating stress concentration in armoured flexible pipes, and applying the theory of value of information and data driven approaches to structural integrity management.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1747194","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43678026","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 : 2020-04-02DOI: 10.1080/24705314.2020.1729659
A. Agusta, B. Leira, S. Thöns
ABSTRACT This paper proposes a framework for the planning of the structural integrity and risk management (SIRM) of offshore structures by utilizing the value of information and action (VoIA) analysis. Multiple structural health information sources, i.e. inspections, structural health monitoring (SHM) and damage detection systems (DDS), are modeled in dependency of the information acquirement state. In the probabilistic modeling, it is distinguished whether the information are predicted or already obtained. Two deteriorating structural system modeling approaches are illustrated and the pre-posterior and posterior updating of the structural system performance is formulated. To enhance the efficiency of the analysis of complex structural systems, a response surface method for load modeling is derived and the model uncertainty of the response surface is explicitly modeled. The formulated approaches are applied to a generic structural system and a typical deepwater jacket platform analyzing four SIRM scenarios. The optimal SIRM strategy is identified by maximizing the VoIA. The results show that the implementation of SIRM can reduce the failure risks and the expected total costs over the service life compared to a scenario without SIRM. It is also observed that information from SHM and DDS can reduce future inspection efforts and enhance the value of SIRM.
{"title":"Value of information-based risk and fatigue management for offshore structures","authors":"A. Agusta, B. Leira, S. Thöns","doi":"10.1080/24705314.2020.1729659","DOIUrl":"https://doi.org/10.1080/24705314.2020.1729659","url":null,"abstract":"ABSTRACT This paper proposes a framework for the planning of the structural integrity and risk management (SIRM) of offshore structures by utilizing the value of information and action (VoIA) analysis. Multiple structural health information sources, i.e. inspections, structural health monitoring (SHM) and damage detection systems (DDS), are modeled in dependency of the information acquirement state. In the probabilistic modeling, it is distinguished whether the information are predicted or already obtained. Two deteriorating structural system modeling approaches are illustrated and the pre-posterior and posterior updating of the structural system performance is formulated. To enhance the efficiency of the analysis of complex structural systems, a response surface method for load modeling is derived and the model uncertainty of the response surface is explicitly modeled. The formulated approaches are applied to a generic structural system and a typical deepwater jacket platform analyzing four SIRM scenarios. The optimal SIRM strategy is identified by maximizing the VoIA. The results show that the implementation of SIRM can reduce the failure risks and the expected total costs over the service life compared to a scenario without SIRM. It is also observed that information from SHM and DDS can reduce future inspection efforts and enhance the value of SIRM.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1729659","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43076453","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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