Pub Date : 2021-04-03DOI: 10.1080/24705314.2020.1862965
Sahar Hasan, E. Elwakil
ABSTRACT The structurally deficient bridges increased from 6.2% to 7% of total bridges in California state. With this percentage, 7%; California state occupies one of the top states for bridges in “poor„ condition. Steel bridges represent about 11% of its bridge networks, so determining the condition rating objectively instead of subjectively is crucial. This paper aims to help significantly optimize the maintenance process by providing a rational basis for making decisions. This paper has integrated knowledge, stochastic analysis, Regression technique, and modeling to help the highway agencies to make a more reliable decision for future maintenance based on predicted conditions. Stochastic Regression models have been built using a training dataset extracted from the National Bridge Inventory (NBI) database for California State steel bridges, considering structural and operational parameters. A validation test has been performed using a new real dataset to measure observed data's correspondence to the predicted values. The results of Average Validity Percentage (85.6%) and Coefficient of Determination (R2 = 91.5%) show that the models' accuracy, the power, and scalability of integrating the knowledge-driven models are acceptable. The integrated developed models provide the infrastructure authority with actionable insights for smarter planning and maintenance decisions as better future outcomes.
{"title":"Knowledge-driven stochastic reliable modeling for steel bridge deck condition rating prediction","authors":"Sahar Hasan, E. Elwakil","doi":"10.1080/24705314.2020.1862965","DOIUrl":"https://doi.org/10.1080/24705314.2020.1862965","url":null,"abstract":"ABSTRACT The structurally deficient bridges increased from 6.2% to 7% of total bridges in California state. With this percentage, 7%; California state occupies one of the top states for bridges in “poor„ condition. Steel bridges represent about 11% of its bridge networks, so determining the condition rating objectively instead of subjectively is crucial. This paper aims to help significantly optimize the maintenance process by providing a rational basis for making decisions. This paper has integrated knowledge, stochastic analysis, Regression technique, and modeling to help the highway agencies to make a more reliable decision for future maintenance based on predicted conditions. Stochastic Regression models have been built using a training dataset extracted from the National Bridge Inventory (NBI) database for California State steel bridges, considering structural and operational parameters. A validation test has been performed using a new real dataset to measure observed data's correspondence to the predicted values. The results of Average Validity Percentage (85.6%) and Coefficient of Determination (R2 = 91.5%) show that the models' accuracy, the power, and scalability of integrating the knowledge-driven models are acceptable. The integrated developed models provide the infrastructure authority with actionable insights for smarter planning and maintenance decisions as better future outcomes.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"91 - 98"},"PeriodicalIF":2.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1862965","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48300394","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: 10.1080/24705314.2021.1875176
A. Chourasia, S. K. Singh, Shubham Singhal, Dirgha Singh, Neelam Chauhan
ABSTRACT Structural safety of code deficient non-engineered buildings relies on adequate strengthening measures, which demands detailed structural assessment and strengthening using the appropriate technique. Structural appraisal of non-engineered buildings with poor construction practices is a key issue, which requires immediate attention. This paper deals with seismic evaluation and rehabilitation of a seismically deficient unreinforced masonry (URM) building. A Detailed Vulnerability Assessment (DVA) was carried out, which included visual inspection; on-site and laboratory tests on building elements, linear static and dynamic analysis to identify structurally deficient elements through evaluation of stress parameters. The existing building was found to be in distressed condition with regards to material and structural requirements as speculated from DVA, further to which adequate strengthening techniques for seismic upgradation of the building were proposed. The main strengthening measures included galvanized iron welded wire mesh (GI WWM) and shotcrete for walls and columns, along with micro-piles-cum-raft for foundation. The building was re-analyzed after strengthening, which showed improved structural parameters complying with the codal limits. It is expected that the proposed seismic evaluation and rehabilitation methodology will be helpful to practising engineers for improving the seismic resilience of URM buildings.
{"title":"Detailed vulnerability assessment and seismic upgradation of non-engineered masonry building","authors":"A. Chourasia, S. K. Singh, Shubham Singhal, Dirgha Singh, Neelam Chauhan","doi":"10.1080/24705314.2021.1875176","DOIUrl":"https://doi.org/10.1080/24705314.2021.1875176","url":null,"abstract":"ABSTRACT Structural safety of code deficient non-engineered buildings relies on adequate strengthening measures, which demands detailed structural assessment and strengthening using the appropriate technique. Structural appraisal of non-engineered buildings with poor construction practices is a key issue, which requires immediate attention. This paper deals with seismic evaluation and rehabilitation of a seismically deficient unreinforced masonry (URM) building. A Detailed Vulnerability Assessment (DVA) was carried out, which included visual inspection; on-site and laboratory tests on building elements, linear static and dynamic analysis to identify structurally deficient elements through evaluation of stress parameters. The existing building was found to be in distressed condition with regards to material and structural requirements as speculated from DVA, further to which adequate strengthening techniques for seismic upgradation of the building were proposed. The main strengthening measures included galvanized iron welded wire mesh (GI WWM) and shotcrete for walls and columns, along with micro-piles-cum-raft for foundation. The building was re-analyzed after strengthening, which showed improved structural parameters complying with the codal limits. It is expected that the proposed seismic evaluation and rehabilitation methodology will be helpful to practising engineers for improving the seismic resilience of URM buildings.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"123 - 134"},"PeriodicalIF":2.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2021.1875176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44251217","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 : 2021-01-02DOI: 10.1080/24705314.2020.1823559
Y. Xiao
ABSTRACT This paper summarizes the author’s work of developing various impact testing equipment and equipment for simulating complex earthquake loading for structural research. The equipment include large diameter split Hopkinson pressure bars (SHPB), large-scale drop-weight testing equipment, field-test facility of truck collisions and multi-axes seismic loading equipment. Several types of building and bridge components were tested under axial or lateral impact loads, simulating vehicular impact actions, sudden collapse and blasts. For vehicular impact action, a procedure of establishing simulative equivalent vehicular frame is proposed, making the vehicular loading tests much easier. Fundamental tests on concrete cylinders and confined concrete cylinders under high-strain rate impacts were also carried using the large-diameter equipment. Large to full-scale reinforced concrete or steel structures were also studied experimentally, using the developed equipment.
{"title":"Development of structural testing equipment for impact and complex loading","authors":"Y. Xiao","doi":"10.1080/24705314.2020.1823559","DOIUrl":"https://doi.org/10.1080/24705314.2020.1823559","url":null,"abstract":"ABSTRACT This paper summarizes the author’s work of developing various impact testing equipment and equipment for simulating complex earthquake loading for structural research. The equipment include large diameter split Hopkinson pressure bars (SHPB), large-scale drop-weight testing equipment, field-test facility of truck collisions and multi-axes seismic loading equipment. Several types of building and bridge components were tested under axial or lateral impact loads, simulating vehicular impact actions, sudden collapse and blasts. For vehicular impact action, a procedure of establishing simulative equivalent vehicular frame is proposed, making the vehicular loading tests much easier. Fundamental tests on concrete cylinders and confined concrete cylinders under high-strain rate impacts were also carried using the large-diameter equipment. Large to full-scale reinforced concrete or steel structures were also studied experimentally, using the developed equipment.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"1 - 15"},"PeriodicalIF":2.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1823559","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43110956","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 : 2021-01-02DOI: 10.1080/24705314.2020.1823558
M. I. Khan, Y. Zhang, C. K. Lee
ABSTRACT With the advancement of material technology, the use of high-strength and high-performance materials in the construction industry is gaining popularity. Steel–polyvinyl alcohol (steel–PVA) hybrid fibre engineered cementitious composites (ECC) is one of such high-performance class of construction materials whose mechanical properties are not well studied in the literature especially in high-strength matrix. Therefore, in this paper, the mechanical properties of four different grades of high-strength steel–PVA ECC are experimentally investigated. ECC with nominal compressive strengths from 60 to 100 MPa are developed. Their mechanical properties including compressive and tensile stress–strain behaviour, elastic modulus and toughness are studied with particular focus on high-strength matrix. Test results show that the developed steel–PVA ECC could achieve good tensile (~0.8%) and compressive (~0.5%) ductility for general structural applications. Simple empirical relationships to predict the elastic modulus and tensile strength of the developed steel–PVA ECC as a function of their compressive strength are suggested. Moreover, an analytical model to generate a complete compressive stress–strain curve of the high-strength steel–PVA ECC is proposed and verified against the experimental results. The proposed stress–strain model would present a useful reference for non-linear analysis of structural elements utilising steel–PVA ECC.
{"title":"Mechanical properties of high-strength steel–polyvinyl alcohol hybrid fibre engineered cementitious composites","authors":"M. I. Khan, Y. Zhang, C. K. Lee","doi":"10.1080/24705314.2020.1823558","DOIUrl":"https://doi.org/10.1080/24705314.2020.1823558","url":null,"abstract":"ABSTRACT With the advancement of material technology, the use of high-strength and high-performance materials in the construction industry is gaining popularity. Steel–polyvinyl alcohol (steel–PVA) hybrid fibre engineered cementitious composites (ECC) is one of such high-performance class of construction materials whose mechanical properties are not well studied in the literature especially in high-strength matrix. Therefore, in this paper, the mechanical properties of four different grades of high-strength steel–PVA ECC are experimentally investigated. ECC with nominal compressive strengths from 60 to 100 MPa are developed. Their mechanical properties including compressive and tensile stress–strain behaviour, elastic modulus and toughness are studied with particular focus on high-strength matrix. Test results show that the developed steel–PVA ECC could achieve good tensile (~0.8%) and compressive (~0.5%) ductility for general structural applications. Simple empirical relationships to predict the elastic modulus and tensile strength of the developed steel–PVA ECC as a function of their compressive strength are suggested. Moreover, an analytical model to generate a complete compressive stress–strain curve of the high-strength steel–PVA ECC is proposed and verified against the experimental results. The proposed stress–strain model would present a useful reference for non-linear analysis of structural elements utilising steel–PVA ECC.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"47 - 57"},"PeriodicalIF":2.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1823558","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46603180","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 : 2021-01-02DOI: 10.1080/24705314.2020.1823557
K. Yang
ABSTRACT This study aimed to estimate the shear friction response of lightweight concrete made using bottom ash aggregates and air foam (LWC-BF) and determine the design parameters including shear transfer capacity, cohesion, and friction angle of such concrete at different interface conditions. The shear friction parameters were straightforwardly formulated from the extension version of the integrated mechanical models derived in our previous study based on the upper bound theorem of concrete plasticity. Eighteen non-reinforced push-off specimens (nine monolithic interfaces and nine interfaces with smooth construction joints) were tested under direct shear and the additional compressive stresses normally applied to the interfaces. The test parameters considered in different interface conditions were the compressive strength of concrete and the magnitude of compressive stresses. The experimental and analytical results showed that the addition of air foam slightly decreases the angle of friction of monolithic interfaces but insignificantly affects that of smooth construction joints. Thus, the effect of air foam added up to 20% by volume on the cohesion and friction angle of concrete was marginal. Therefore, the proposed shear friction parameters are promising to reasonably assess the shear friction strength of LWC-BF interfaces.
{"title":"Shear friction response of lightweight concrete using bottom ash aggregates and air foams","authors":"K. Yang","doi":"10.1080/24705314.2020.1823557","DOIUrl":"https://doi.org/10.1080/24705314.2020.1823557","url":null,"abstract":"ABSTRACT This study aimed to estimate the shear friction response of lightweight concrete made using bottom ash aggregates and air foam (LWC-BF) and determine the design parameters including shear transfer capacity, cohesion, and friction angle of such concrete at different interface conditions. The shear friction parameters were straightforwardly formulated from the extension version of the integrated mechanical models derived in our previous study based on the upper bound theorem of concrete plasticity. Eighteen non-reinforced push-off specimens (nine monolithic interfaces and nine interfaces with smooth construction joints) were tested under direct shear and the additional compressive stresses normally applied to the interfaces. The test parameters considered in different interface conditions were the compressive strength of concrete and the magnitude of compressive stresses. The experimental and analytical results showed that the addition of air foam slightly decreases the angle of friction of monolithic interfaces but insignificantly affects that of smooth construction joints. Thus, the effect of air foam added up to 20% by volume on the cohesion and friction angle of concrete was marginal. Therefore, the proposed shear friction parameters are promising to reasonably assess the shear friction strength of LWC-BF interfaces.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"37 - 46"},"PeriodicalIF":2.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1823557","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48296654","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 : 2021-01-02DOI: 10.1080/24705314.2020.1823556
J. Vanlalruata, C. Marthong
ABSTRACT The aim of the present study is to determine the loss in the flexural strength capacity of a reinforced concrete (RC) beam due to the presence of cold joint under two conditions: (i) different mix of concrete and (ii) different age of the cold joint. Indian Standard method of testing the flexural strength of an RC beam was adopted. In this study 40 beams were casted out of which 8 were of controlled beams and the remaining 32 were of cold jointed specimens. Cold jointed specimens were casted up to half by inclining approximately at 45° to replicate the common practice on site and the remaining portions were casted at different intervals of time. From the experimental study, the amount of loss in the flexural strength capacity of the RC beams due to the presence of cold joint for different age was observed. A deduction chart to account for the loss due to the presence of cold joint is proposed.
{"title":"Effect of cold joint on the flexural strength of RC beam","authors":"J. Vanlalruata, C. Marthong","doi":"10.1080/24705314.2020.1823556","DOIUrl":"https://doi.org/10.1080/24705314.2020.1823556","url":null,"abstract":"ABSTRACT The aim of the present study is to determine the loss in the flexural strength capacity of a reinforced concrete (RC) beam due to the presence of cold joint under two conditions: (i) different mix of concrete and (ii) different age of the cold joint. Indian Standard method of testing the flexural strength of an RC beam was adopted. In this study 40 beams were casted out of which 8 were of controlled beams and the remaining 32 were of cold jointed specimens. Cold jointed specimens were casted up to half by inclining approximately at 45° to replicate the common practice on site and the remaining portions were casted at different intervals of time. From the experimental study, the amount of loss in the flexural strength capacity of the RC beams due to the presence of cold joint for different age was observed. A deduction chart to account for the loss due to the presence of cold joint is proposed.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"28 - 36"},"PeriodicalIF":2.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1823556","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47712196","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 : 2020-12-31DOI: 10.1080/24705314.2020.1823555
Ishfaq Rashid Sheikh, M. Y. Shah
ABSTRACT Construction and demolition (C&D) wastes are found to be the main source of unwanted materials produced worldwide. Due to the insufficient amount of high-quality fresh limestone aggregates, construction and demolition waste are used as an alternative base course material for highway construction. The stabilization of C&D recycled aggregate waste with ordinary portland cement (OPC) has been repeatedly used by the researchers to improve the performance of the base course in highway construction. The studies related to the geosynthetic-reinforced C&D waste are limited. In this study, the efficacy of geosynthetics reinforced bases was evaluated within the base course with three different base thickness (120, 150 and 200 mm). Two different infill materials, namely, C&D waste and limestone aggregates were used and plate load tests were conducted to simulate traffic loading over geosynthetic reinforced and unreinforced unpaved test sections. This study aims to present the results in terms of load versus deformation and load versus vertical stress distribution. It was observed that the C&D waste improvement factor is more than virgin aggregates (limestone aggregates). Due to the inclusion of geocell and geotextile, the average bearing capacity improvement factor enhances by 62% and the vertical stresses decrease significantly.
{"title":"Performance evaluation of construction and demolition waste aggregates as an alternative base course material in highway construction","authors":"Ishfaq Rashid Sheikh, M. Y. Shah","doi":"10.1080/24705314.2020.1823555","DOIUrl":"https://doi.org/10.1080/24705314.2020.1823555","url":null,"abstract":"ABSTRACT Construction and demolition (C&D) wastes are found to be the main source of unwanted materials produced worldwide. Due to the insufficient amount of high-quality fresh limestone aggregates, construction and demolition waste are used as an alternative base course material for highway construction. The stabilization of C&D recycled aggregate waste with ordinary portland cement (OPC) has been repeatedly used by the researchers to improve the performance of the base course in highway construction. The studies related to the geosynthetic-reinforced C&D waste are limited. In this study, the efficacy of geosynthetics reinforced bases was evaluated within the base course with three different base thickness (120, 150 and 200 mm). Two different infill materials, namely, C&D waste and limestone aggregates were used and plate load tests were conducted to simulate traffic loading over geosynthetic reinforced and unreinforced unpaved test sections. This study aims to present the results in terms of load versus deformation and load versus vertical stress distribution. It was observed that the C&D waste improvement factor is more than virgin aggregates (limestone aggregates). Due to the inclusion of geocell and geotextile, the average bearing capacity improvement factor enhances by 62% and the vertical stresses decrease significantly.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"58 - 66"},"PeriodicalIF":2.1,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1823555","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41697679","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 : 2020-12-31DOI: 10.1080/24705314.2020.1824668
So-Yeong Choi, Il-Sun Kim, E. Yang
ABSTRACT Calcium leaching degradation could be happened in RC members due to the contact with pure water in underground conditions. And it is used that concrete with improved durability by using mineral admixture in the underground structures. Thus, it is needed to evaluate the resistance of calcium leaching for underground concrete mixed with mineral admixtures. In this study to evaluate the effects of long-term calcium leaching on the RC members mixed with mineral admixture are investigated. From the test results, when the RC member is attacked by calcium leaching, the yield load decreased, and the deflection at this time increased. And, the moment at the time of the inflection point of curvature decreased as well. Also, while a continuous decrease in compressive strength occurred with leaching period, the yield point and deflection value of an RC member with relatively low water binder ratio and low replacement ratio of mineral admixture as binder did not show significant changes. Consequently, when the concrete is applied to the underground structure which is exposed to a calcium leaching environment, it is not desirable to use high water-binder ratio or a large amount of mineral admixture as binder.
{"title":"An experimental study on the flexural behavior of RC member under long-term calcium leaching degradation","authors":"So-Yeong Choi, Il-Sun Kim, E. Yang","doi":"10.1080/24705314.2020.1824668","DOIUrl":"https://doi.org/10.1080/24705314.2020.1824668","url":null,"abstract":"ABSTRACT Calcium leaching degradation could be happened in RC members due to the contact with pure water in underground conditions. And it is used that concrete with improved durability by using mineral admixture in the underground structures. Thus, it is needed to evaluate the resistance of calcium leaching for underground concrete mixed with mineral admixtures. In this study to evaluate the effects of long-term calcium leaching on the RC members mixed with mineral admixture are investigated. From the test results, when the RC member is attacked by calcium leaching, the yield load decreased, and the deflection at this time increased. And, the moment at the time of the inflection point of curvature decreased as well. Also, while a continuous decrease in compressive strength occurred with leaching period, the yield point and deflection value of an RC member with relatively low water binder ratio and low replacement ratio of mineral admixture as binder did not show significant changes. Consequently, when the concrete is applied to the underground structure which is exposed to a calcium leaching environment, it is not desirable to use high water-binder ratio or a large amount of mineral admixture as binder.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"6 1","pages":"16 - 27"},"PeriodicalIF":2.1,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1824668","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41756296","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 : 2020-09-17DOI: 10.1080/24705314.2020.1783122
Nand Kumar, V. Naranje, S. Salunkhe
ABSTRACT This paper describes a cloud-based software framework to predict cement strength for 2 days, 7 days and 28 days. Levenbarg-Marquardt back-propagation-artificial neural network (LMBP-ANN) is used to build a prediction model. This ANN model uses 70% of data for training (70%, 212 data records), testing (15%, 46 data records) and for validation (15%, 46 data records). A total of 16 significant input parameters are considered for the cement strength prediction. The user interface and software framework are built using the Python programming language. Multiple Python packages are used for the implementation of the ANN model. The cloud server having Ubuntu operating system has been used to host the web application for prediction of cement strength. The software application is tested using real-time data from various cement industries. The prediction of the cement strength of the proposed ANN-based software application appears to be very similar to those currently generated in experimental data in the cement manufacturing industry. The adequacy of the developed model based on the back-propagation ANN algorithm is confirmed as the Pearson correlation of experimental value and predicted value. The calculated value of R for experimentations on the data is 0.82539 and is 0.6813.
{"title":"Cement strength prediction using cloud-based machine learning techniques","authors":"Nand Kumar, V. Naranje, S. Salunkhe","doi":"10.1080/24705314.2020.1783122","DOIUrl":"https://doi.org/10.1080/24705314.2020.1783122","url":null,"abstract":"ABSTRACT This paper describes a cloud-based software framework to predict cement strength for 2 days, 7 days and 28 days. Levenbarg-Marquardt back-propagation-artificial neural network (LMBP-ANN) is used to build a prediction model. This ANN model uses 70% of data for training (70%, 212 data records), testing (15%, 46 data records) and for validation (15%, 46 data records). A total of 16 significant input parameters are considered for the cement strength prediction. The user interface and software framework are built using the Python programming language. Multiple Python packages are used for the implementation of the ANN model. The cloud server having Ubuntu operating system has been used to host the web application for prediction of cement strength. The software application is tested using real-time data from various cement industries. The prediction of the cement strength of the proposed ANN-based software application appears to be very similar to those currently generated in experimental data in the cement manufacturing industry. The adequacy of the developed model based on the back-propagation ANN algorithm is confirmed as the Pearson correlation of experimental value and predicted value. The calculated value of R for experimentations on the data is 0.82539 and is 0.6813.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"5 1","pages":"244 - 251"},"PeriodicalIF":2.1,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1783122","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46228125","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 : 2020-09-17DOI: 10.1080/24705314.2020.1783121
Sarranya Banerjee, Aparna (Dey) Ghosh
ABSTRACT This paper presents an optimal design procedure for a nonlinear TMD with Bingham-type damping that can lead to a more economic and realistic design of the damper. The optimization problem is solved in the Genetic Algorithm (GA) framework. Considering small nonlinearities, the nonlinear TMD design using GA is validated through standard equivalent linearization method. The efficacy of the TMD designs is presented through a numerical simulation study on four different single-degree-of-freedom structure-TMD systems subjected to recorded earthquake ground motions. Results indicate that the optimally designed nonlinear TMD with Bingham-type damping can effectively reduce the size of the TMD damping element at the cost of a very slight degradation in control performance as compared to the linear TMD. The improved performance of the nonlinear TMD with Bingham-type damping over the linear TMD that develops post-design nonlinearities is also shown. Further, a robust design procedure of the nonlinear TMD using GA is presented that can cater to perturbations in the natural frequency of the primary structure. Thus, the optimal design procedure using GA for the nonlinear TMD offers several advantages as compared to the statistical linearization approach.
{"title":"Optimal design of nonlinear TMD with Bingham-type damping for base-excited structures","authors":"Sarranya Banerjee, Aparna (Dey) Ghosh","doi":"10.1080/24705314.2020.1783121","DOIUrl":"https://doi.org/10.1080/24705314.2020.1783121","url":null,"abstract":"ABSTRACT This paper presents an optimal design procedure for a nonlinear TMD with Bingham-type damping that can lead to a more economic and realistic design of the damper. The optimization problem is solved in the Genetic Algorithm (GA) framework. Considering small nonlinearities, the nonlinear TMD design using GA is validated through standard equivalent linearization method. The efficacy of the TMD designs is presented through a numerical simulation study on four different single-degree-of-freedom structure-TMD systems subjected to recorded earthquake ground motions. Results indicate that the optimally designed nonlinear TMD with Bingham-type damping can effectively reduce the size of the TMD damping element at the cost of a very slight degradation in control performance as compared to the linear TMD. The improved performance of the nonlinear TMD with Bingham-type damping over the linear TMD that develops post-design nonlinearities is also shown. Further, a robust design procedure of the nonlinear TMD using GA is presented that can cater to perturbations in the natural frequency of the primary structure. Thus, the optimal design procedure using GA for the nonlinear TMD offers several advantages as compared to the statistical linearization approach.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"5 1","pages":"211 - 222"},"PeriodicalIF":2.1,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/24705314.2020.1783121","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42608952","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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