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":"5 1","pages":"113 - 126"},"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":"5 1","pages":"72 - 86"},"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: 10.1080/24705314.2020.1729659
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":"5 1","pages":"127 - 141"},"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}
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":"5 1","pages":"71 - 71"},"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: 10.1080/24705314.2020.1729519
Y. El Assami, M. Drissi Habti, V. Raman
ABSTRACT Offshore wind-blades with excessive lengths (>100 m) are critical parts because of monolithic bonding that is holding the two halves, which may lead to sudden separation of edges while wind-turbine is in service. Offshore wind generation maintenance teams are targeting zero-maintenance. As a matter of fact, in the event of initiating mechanical damage, top and bottom skins of a wind blade should hold together as long as possible to allow enough time for maintenance to take place. We suggest an innovative concept that is a two-step strategy which consists first in strengthening the bond joints with carbon-nanotubes (CNTs), that be followed by a stitching of the two bonded joints with a composite cord. It is worthwhile to note that CNT can either reinforce the two halves of wind-blades and/or be added in between the pre-pregs composite plies before curing, to enhance bonding stiffness. A Finite Element model is proposed where simulation takes into account parameters such as CNT-weight fraction, chirality and CNTs inclination versus mechanical loading. Higher stiffness of joints and higher delamination strength for composites, are expected out of the concept. This article is intended to be a preliminary numerical study that must be viewed as a proof of concept.
{"title":"Stiffening offshore composite wind-blades bonding joints by carbon nanotubes reinforced resin – a new concept","authors":"Y. El Assami, M. Drissi Habti, V. Raman","doi":"10.1080/24705314.2020.1729519","DOIUrl":"https://doi.org/10.1080/24705314.2020.1729519","url":null,"abstract":"ABSTRACT Offshore wind-blades with excessive lengths (>100 m) are critical parts because of monolithic bonding that is holding the two halves, which may lead to sudden separation of edges while wind-turbine is in service. Offshore wind generation maintenance teams are targeting zero-maintenance. As a matter of fact, in the event of initiating mechanical damage, top and bottom skins of a wind blade should hold together as long as possible to allow enough time for maintenance to take place. We suggest an innovative concept that is a two-step strategy which consists first in strengthening the bond joints with carbon-nanotubes (CNTs), that be followed by a stitching of the two bonded joints with a composite cord. It is worthwhile to note that CNT can either reinforce the two halves of wind-blades and/or be added in between the pre-pregs composite plies before curing, to enhance bonding stiffness. A Finite Element model is proposed where simulation takes into account parameters such as CNT-weight fraction, chirality and CNTs inclination versus mechanical loading. Higher stiffness of joints and higher delamination strength for composites, are expected out of the concept. This article is intended to be a preliminary numerical study that must be viewed as a proof of concept.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"5 1","pages":"103 - 87"},"PeriodicalIF":2.1,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1729519","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44533591","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 : 2020-01-02DOI: 10.1080/24705314.2019.1692166
D. Pittenger, D. Gransberg
ABSTRACT Portland cement slurry seal and microsurfacing can both be used as pavement preservation treatments to fill ruts, which extends service life and decreases road surface life cycle cost. Microsurfacing has a history for being a technically effective and cost-efficient solution for correcting pavement rutting in both asphalt and concrete pavement surfaces. On the other hand, Portland cement slurry seal is a relatively new product that provides an alternative rut filling solution. The potential of both treatments as rut fillers is generally unrecognized and as such, they are both underutilized in that role. This paper compares the life cycle costs of both treatments, using friction data as the primary performance indicator derived from field trial skid data collected over a period of 36 months on the same highway. The paper finds that each alternative performed comparably with regard to surface friction deterioration, and the life cycle cost output was such that either treatment is an economically feasible solution for filling ruts in both asphalt and concrete pavements.
{"title":"Life cycle cost analysis of Portland cement slurry seal and microsurfacing to correct rutting","authors":"D. Pittenger, D. Gransberg","doi":"10.1080/24705314.2019.1692166","DOIUrl":"https://doi.org/10.1080/24705314.2019.1692166","url":null,"abstract":"ABSTRACT Portland cement slurry seal and microsurfacing can both be used as pavement preservation treatments to fill ruts, which extends service life and decreases road surface life cycle cost. Microsurfacing has a history for being a technically effective and cost-efficient solution for correcting pavement rutting in both asphalt and concrete pavement surfaces. On the other hand, Portland cement slurry seal is a relatively new product that provides an alternative rut filling solution. The potential of both treatments as rut fillers is generally unrecognized and as such, they are both underutilized in that role. This paper compares the life cycle costs of both treatments, using friction data as the primary performance indicator derived from field trial skid data collected over a period of 36 months on the same highway. The paper finds that each alternative performed comparably with regard to surface friction deterioration, and the life cycle cost output was such that either treatment is an economically feasible solution for filling ruts in both asphalt and concrete pavements.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"5 1","pages":"1 - 7"},"PeriodicalIF":2.1,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2019.1692166","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42990566","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 : 2020-01-02DOI: 10.1080/24705314.2019.1701799
Kashif Salman, Dookie Kim, A. Maher, A. Latif
ABSTRACT This paper considers the static and dynamic analysis of a high-rise structure under the lateral loads. Firstly, the static analysis was carried out for four different structural systems (i.e. moment-resisting frame, building frame, and outrigger braced frame (OBF) system). Under the same static loading, it was found that the outrigger braced system provides an optimal control to high-rise structure. To earn these results, an analytical procedure was carried out that manifests the efficiency induced by the bracing system. Secondly, dynamic analysis was considered to evaluate the vibration response of a tall building. To this end, the outrigger system was compared with the Pendulum tuned mass dampers (PTMD). The parametric analysis investigates that the outrigger system provides an optimal reduction of 33% for one and 60% for two outriggers in the top displacement and drift response of the structure. This alteration in the response was verified using an analytical solution for the top and middle of the structure. The acceleration reduction capacity of outriggers was found to be 40% and PTMD with 35% respectively. Based on the comparative static and dynamic analysis OBF was found to be an effective addition to the sway frame.
{"title":"Optimal control on structural response using outrigger braced frame system under lateral loads","authors":"Kashif Salman, Dookie Kim, A. Maher, A. Latif","doi":"10.1080/24705314.2019.1701799","DOIUrl":"https://doi.org/10.1080/24705314.2019.1701799","url":null,"abstract":"ABSTRACT This paper considers the static and dynamic analysis of a high-rise structure under the lateral loads. Firstly, the static analysis was carried out for four different structural systems (i.e. moment-resisting frame, building frame, and outrigger braced frame (OBF) system). Under the same static loading, it was found that the outrigger braced system provides an optimal control to high-rise structure. To earn these results, an analytical procedure was carried out that manifests the efficiency induced by the bracing system. Secondly, dynamic analysis was considered to evaluate the vibration response of a tall building. To this end, the outrigger system was compared with the Pendulum tuned mass dampers (PTMD). The parametric analysis investigates that the outrigger system provides an optimal reduction of 33% for one and 60% for two outriggers in the top displacement and drift response of the structure. This alteration in the response was verified using an analytical solution for the top and middle of the structure. The acceleration reduction capacity of outriggers was found to be 40% and PTMD with 35% respectively. Based on the comparative static and dynamic analysis OBF was found to be an effective addition to the sway frame.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"5 1","pages":"40 - 50"},"PeriodicalIF":2.1,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2019.1701799","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47475926","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 : 2020-01-02DOI: 10.1080/24705314.2019.1692165
P. Munjal, S. Singh
ABSTRACT This paper focuses on the flexural behavior of masonry walls strengthened with precast engineered cementitious composite (ECC) sheet. The walls were subjected to out-of-plane static loading and analyzed using ABAQUS. For the validation of numerical results, four masonry walls of size 762 × 480 × 230 mm were cast using burnt clay bricks and cement mortar. Out of four, two masonry walls were strengthened with precast ECC sheet using epoxy as adhesive, and the remaining two acted as control specimens. The validation of numerical results with the experimental results shows that the model can effectively capture the nonlinear behavior of masonry and ECC to predict the strength and failure mechanism. The influence of mesh size on the numerical results is also reported. Further, a parametric study has been carried out to observe the effect of several parameters such as percentage of ECC reinforcement ratio, span/depth (L/d) ratio and width/thickness (b/h) ratio of the strengthened masonry walls. This study reveals that the precast ECC sheet increases the load-carrying capacity and ductility of brick masonry walls and hence demonstrates its performance as a strengthening element for brick masonry structures.
{"title":"Out-of-plane response of ECC-strengthened masonry walls","authors":"P. Munjal, S. Singh","doi":"10.1080/24705314.2019.1692165","DOIUrl":"https://doi.org/10.1080/24705314.2019.1692165","url":null,"abstract":"ABSTRACT This paper focuses on the flexural behavior of masonry walls strengthened with precast engineered cementitious composite (ECC) sheet. The walls were subjected to out-of-plane static loading and analyzed using ABAQUS. For the validation of numerical results, four masonry walls of size 762 × 480 × 230 mm were cast using burnt clay bricks and cement mortar. Out of four, two masonry walls were strengthened with precast ECC sheet using epoxy as adhesive, and the remaining two acted as control specimens. The validation of numerical results with the experimental results shows that the model can effectively capture the nonlinear behavior of masonry and ECC to predict the strength and failure mechanism. The influence of mesh size on the numerical results is also reported. Further, a parametric study has been carried out to observe the effect of several parameters such as percentage of ECC reinforcement ratio, span/depth (L/d) ratio and width/thickness (b/h) ratio of the strengthened masonry walls. This study reveals that the precast ECC sheet increases the load-carrying capacity and ductility of brick masonry walls and hence demonstrates its performance as a strengthening element for brick masonry structures.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"5 1","pages":"18 - 30"},"PeriodicalIF":2.1,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2019.1692165","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42419603","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 : 2020-01-02DOI: 10.1080/24705314.2019.1692167
Pritam Hait, Arjun Sil, S. Choudhury
ABSTRACT This paper investigated multi-objective seismic damage assessment procedure. Primarily, it estimates damage index (DI) of reinforcement concrete (RC) framed low-rise residential buildings under the seismic ground motions. Three-dimensional DI has been estimated for a four-storey building by Park–Ang method considering irregularities. With increasing storey level, calculation of Park–Ang DI becomes tedious and more time consuming; therefore, this method is difficult to implement in large-scale damage evaluation. In this study, a simplified method has been proposed to estimate global DI (GDI) for regular and irregular buildings. It has been observed that ground floor experiences maximum damage where roof is experiencing least damage. Alternatively, an artificial neural network based prediction model has also been adopted in this paper to minimize the error. Factors affecting GDI of RC framed building has been narrated. To visualize the weightage of the relation between input parameters and GDI, a neural interpretation diagram has also been presented. The present study could be useful for designers to estimate GDI as performance criteria within short time frame. Abbreviation: LDI: local damage index of a member; CPWD: Central public work department; SDI: storey damage index of a particular storey; MVR: multivariable regression; GDI: global damage index of the entire building; MAD: mean absolute deviation; EDPs: engineering demand parameters; MSE: mean square error; NLTHA: nonlinear time history analysis; MAPE: mean absolute percentage error; ANN: artificial neural network; PGA: peak ground acceleration; ANND: artificial neural network of damage model; Sa: spectral acceleration; SDOF: single-degree of freedom system; PGV: peak ground velocity; MDOF: multi-degree of freedom system; PGD: peak ground displacement; DBDI: ductility-based damage indices; IDR: inter-storey drift; RC: reinforcement concrete; SCGM: spectrum compatible ground motion; PAR: plan aspect ratio; EQ: earthquake; PWD: public work department
{"title":"Seismic damage assessment and prediction using artificial neural network of RC building considering irregularities","authors":"Pritam Hait, Arjun Sil, S. Choudhury","doi":"10.1080/24705314.2019.1692167","DOIUrl":"https://doi.org/10.1080/24705314.2019.1692167","url":null,"abstract":"ABSTRACT This paper investigated multi-objective seismic damage assessment procedure. Primarily, it estimates damage index (DI) of reinforcement concrete (RC) framed low-rise residential buildings under the seismic ground motions. Three-dimensional DI has been estimated for a four-storey building by Park–Ang method considering irregularities. With increasing storey level, calculation of Park–Ang DI becomes tedious and more time consuming; therefore, this method is difficult to implement in large-scale damage evaluation. In this study, a simplified method has been proposed to estimate global DI (GDI) for regular and irregular buildings. It has been observed that ground floor experiences maximum damage where roof is experiencing least damage. Alternatively, an artificial neural network based prediction model has also been adopted in this paper to minimize the error. Factors affecting GDI of RC framed building has been narrated. To visualize the weightage of the relation between input parameters and GDI, a neural interpretation diagram has also been presented. The present study could be useful for designers to estimate GDI as performance criteria within short time frame. Abbreviation: LDI: local damage index of a member; CPWD: Central public work department; SDI: storey damage index of a particular storey; MVR: multivariable regression; GDI: global damage index of the entire building; MAD: mean absolute deviation; EDPs: engineering demand parameters; MSE: mean square error; NLTHA: nonlinear time history analysis; MAPE: mean absolute percentage error; ANN: artificial neural network; PGA: peak ground acceleration; ANND: artificial neural network of damage model; Sa: spectral acceleration; SDOF: single-degree of freedom system; PGV: peak ground velocity; MDOF: multi-degree of freedom system; PGD: peak ground displacement; DBDI: ductility-based damage indices; IDR: inter-storey drift; RC: reinforcement concrete; SCGM: spectrum compatible ground motion; PAR: plan aspect ratio; EQ: earthquake; PWD: public work department","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"5 1","pages":"51 - 69"},"PeriodicalIF":2.1,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2019.1692167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60128213","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 : 2020-01-02DOI: 10.1080/24705314.2019.1692164
Hyunwook Kim, C. Lee, C. Shon, Hoon Moon, C. Chung
ABSTRACT This work investigates the mechanical performance and chloride ion penetration of base concrete for shotcrete that was reinforced with non-corroding polyolefin fibers for marine structure application. Test parameters included polyolefin fiber and conventional steel fiber, use of ground granulated blast furnace slag (GGBFS), and two different methods to evaluate chloride ion penetration property (ASTM C 1202 and NT-BUILD 492). Test results show that concrete containing polyolefin fiber had lower compressive strength, flexural strength, and toughness than those with steel fiber, but still met mechanical property criteria of shotcrete. While charge passed value of the concrete with polyolefin fiber was lower than that with steel fiber, the chloride ion diffusion coefficient of the concrete with polyolefin fiber was slightly higher than that with steel fiber. Concrete replaced with 40% GGBFS by mass of cement leaded to better mechanical performance and chloride ion penetration resistance than that without GGBFS regardless of both ASTM C 1202 and NT-Build 492 methods. Based on the test results, the use of polyolefin fibers has benefit as reinforcement of shotcrete used for marine structure application.
摘要:本文研究了船用结构用无腐蚀聚烯烃纤维喷射混凝土基层混凝土的力学性能和氯离子渗透性能。测试参数包括聚烯烃纤维和常规钢纤维，使用磨粒高炉渣(GGBFS)，以及两种不同的方法来评估氯离子渗透性能(ASTM C 1202和NT-BUILD 492)。试验结果表明，含聚烯烃纤维混凝土的抗压强度、抗弯强度和韧性均低于含钢纤维混凝土，但仍符合喷射混凝土的力学性能标准。掺有聚烯烃纤维的混凝土电荷通过值低于掺有钢纤维的混凝土，但氯离子扩散系数略高于掺有钢纤维的混凝土。无论采用ASTM C 1202和NT-Build 492方法，用40% GGBFS取代水泥质量的混凝土比不使用GGBFS的混凝土具有更好的机械性能和抗氯离子渗透性能。试验结果表明，聚烯烃纤维作为海洋结构喷射混凝土的加固材料具有一定的优越性。
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