1.
Junaedi Utomo; Muhammad Nur Khusyeni; Windu Partono; Ay Lie Han; Buntara S. Gan
Experimental Investigation on the Failure Behavior of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Reinforced Concrete T-beams Journal Article
In: Civil Engineering Dimension, 23 (2), pp. 115-122, 2021, ISSN: 1979-570X.
@article{nokey,
title = {Experimental Investigation on the Failure Behavior of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Reinforced Concrete T-beams},
author = {Junaedi Utomo and Muhammad Nur Khusyeni and Windu Partono and Ay Lie Han and Buntara S. Gan},
url = {https://ced.petra.ac.id/index.php/civ/article/view/23978},
doi = {https://doi.org/10.9744/ced.23.2.115-122},
issn = {1979-570X},
year = {2021},
date = {2021-10-05},
journal = {Civil Engineering Dimension},
volume = {23},
number = {2},
pages = {115-122},
abstract = {Carbon Fiber Reinforced Polymers (CFRP) are widely used as external concrete reinforcement. The behavior of T-beams strengthened in shear and flexure using CFRP sheets and plates was studied to analyze the load carrying capacity and failure mode as compared to conventional concrete members. The bonding response of the plate-to-concrete was investigated by comparing a specimen with a plate anchored at the far ends, one without anchoring. The sheets were in situ wet lay-up, the plate was pre-impregnated and pultruded during manufacturing. The test result suggested that this integrated strengthening method notably improved the load-carrying capacity, it was also demonstrated that anchoring had a positive but insignificant effect on the moment capacity and deformation. The influence of anchoring was noteworthy from the point of view that it shifted the failure mode from debonding to CFRP plate rupture. The most important factors influencing the behavior of CFRP strengthened beams are outlined.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Carbon Fiber Reinforced Polymers (CFRP) are widely used as external concrete reinforcement. The behavior of T-beams strengthened in shear and flexure using CFRP sheets and plates was studied to analyze the load carrying capacity and failure mode as compared to conventional concrete members. The bonding response of the plate-to-concrete was investigated by comparing a specimen with a plate anchored at the far ends, one without anchoring. The sheets were in situ wet lay-up, the plate was pre-impregnated and pultruded during manufacturing. The test result suggested that this integrated strengthening method notably improved the load-carrying capacity, it was also demonstrated that anchoring had a positive but insignificant effect on the moment capacity and deformation. The influence of anchoring was noteworthy from the point of view that it shifted the failure mode from debonding to CFRP plate rupture. The most important factors influencing the behavior of CFRP strengthened beams are outlined.
2.
Junaedi Utomo; Nauval Rabbani; Sri Tudjono; Ay Lie Han; Sukamta
The Influence of External CFRP String Reinforcement on The Behavior of Flexural RC Elements Journal Article
In: JGEET (Journal of Geoscience, Engineering, Environment, and Technology), 6 (3), pp. 141 - 146, 2021, ISSN: 2541-5794.
@article{nokey,
title = {The Influence of External CFRP String Reinforcement on The Behavior of Flexural RC Elements},
author = {Junaedi Utomo and Nauval Rabbani and Sri Tudjono and Ay Lie Han and Sukamta},
url = {https://journal.uir.ac.id/index.php/JGEET/article/view/5685},
doi = {10.25299/jgeet.2021.6.3.5685},
issn = {2541-5794},
year = {2021},
date = {2021-09-17},
journal = {JGEET (Journal of Geoscience, Engineering, Environment, and Technology)},
volume = {6},
number = {3},
pages = {141 - 146},
abstract = {External reinforcement is an excellent method for improving the load carrying capacity and ductility behaviour of reinforced concrete members in flexure. Enhancement becomes a necessity when current standards mandate a higher performance compared to older codes. External reinforcement is an environmentally friendly and sustainable solution, since demolition and re-building could be postponed, and the building can be used while work in conducted on the members. Carbon Fiber Reinforced Polymers (CFRP), having a low weight-to-volume ratio and an excellent resistance to corrosion, can be used as external reinforcement to effectively increase the flexural and shear strength of a member. To evaluate the effectiveness of CFRP strings, two types of reinforced concrete T-beams were tested. The specimens consist of a strengthened member in both shear and flexure using CFRP wraps and CFRP strings, and a conventional reinforced concrete beam. The specimens were subjected to a one-point-loading system to simulate high shear stresses in combination with a maximum bending moment at mid-point. The installation of CFRP strings was conducted using the Near Surface Mounted (NSM) method, while the sheets were Externally Bonded Reinforcement (EBR). The strings and sheets were impregnated and pultruded on side. The test results showed that the strings and wraps substantially increased the ultimate load carrying capacity and ductility of the member. The ultimate load enhancement was found to be 32% from 117kN to 154kN, and the vertical deformation improved 25% from 16 mm to 20 mm. The failure mode was characterized by initial debonding of the strings in the interface between the strings and the epoxy, followed by string-rupture. The two strings ruptured concurrently, due to stress re-distribution within the member.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
External reinforcement is an excellent method for improving the load carrying capacity and ductility behaviour of reinforced concrete members in flexure. Enhancement becomes a necessity when current standards mandate a higher performance compared to older codes. External reinforcement is an environmentally friendly and sustainable solution, since demolition and re-building could be postponed, and the building can be used while work in conducted on the members. Carbon Fiber Reinforced Polymers (CFRP), having a low weight-to-volume ratio and an excellent resistance to corrosion, can be used as external reinforcement to effectively increase the flexural and shear strength of a member. To evaluate the effectiveness of CFRP strings, two types of reinforced concrete T-beams were tested. The specimens consist of a strengthened member in both shear and flexure using CFRP wraps and CFRP strings, and a conventional reinforced concrete beam. The specimens were subjected to a one-point-loading system to simulate high shear stresses in combination with a maximum bending moment at mid-point. The installation of CFRP strings was conducted using the Near Surface Mounted (NSM) method, while the sheets were Externally Bonded Reinforcement (EBR). The strings and sheets were impregnated and pultruded on side. The test results showed that the strings and wraps substantially increased the ultimate load carrying capacity and ductility of the member. The ultimate load enhancement was found to be 32% from 117kN to 154kN, and the vertical deformation improved 25% from 16 mm to 20 mm. The failure mode was characterized by initial debonding of the strings in the interface between the strings and the epoxy, followed by string-rupture. The two strings ruptured concurrently, due to stress re-distribution within the member.
3.
Nuroji; Mhd. Rony Asshidiqie; Sukamta; Han Ay Lie
The development of A Simulation Tool for Numerical Modelling of High Flexure and High Shear Reinforced Concrete Elements Journal Article
In: Jurnal Ilmiah Bidang Ilmu Kerekayasaan, 42 (2), pp. 106 - 116, 2021, ISSN: 2460-9919.
@article{nokey,
title = {The development of A Simulation Tool for Numerical Modelling of High Flexure and High Shear Reinforced Concrete Elements},
author = {Nuroji and Mhd. Rony Asshidiqie and Sukamta and Han Ay Lie
},
url = {https://ejournal.undip.ac.id/index.php/teknik/article/view/32683},
doi = {https://doi.org/10.14710/teknik.v42i2.32683},
issn = {2460-9919},
year = {2021},
date = {2021-08-31},
urldate = {2021-08-31},
journal = {Jurnal Ilmiah Bidang Ilmu Kerekayasaan},
volume = {42},
number = {2},
pages = {106 - 116},
abstract = {The weakness of full-scale testing of reinforced concrete elements in a laboratory is the long period, both to prepare and test specimens and the high-cost, resulting in a limited number of specimens. The heavy specimen creates another difficulty during set-up. Data accuracy depends on apparatus precision, laboratory conditions, and the technicians' expertise in experimenting. A finite element model was constructed to simulate a reinforced concrete element subject to high flexure and shear stresses induced by vertical and horizontal forces to overcome these constraints. The model can further be utilized to evaluate the effects of independent variables on the behavior of the member. The model was validated both numerically and experimentally to ensure accuracy and precision. The numerical validation was conducted through a sensitivity analyses process on the finesses of meshing and loading incrementation. At the same time, the load-deformation data and the crack propagation of identical laboratory-tested elements were utilized for validation of the experimental data. It was proven that the developed model predicts the behavior of the beam to a high degree of correctness. The model can further be used as a tool for analyses in the field.
},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The weakness of full-scale testing of reinforced concrete elements in a laboratory is the long period, both to prepare and test specimens and the high-cost, resulting in a limited number of specimens. The heavy specimen creates another difficulty during set-up. Data accuracy depends on apparatus precision, laboratory conditions, and the technicians' expertise in experimenting. A finite element model was constructed to simulate a reinforced concrete element subject to high flexure and shear stresses induced by vertical and horizontal forces to overcome these constraints. The model can further be utilized to evaluate the effects of independent variables on the behavior of the member. The model was validated both numerically and experimentally to ensure accuracy and precision. The numerical validation was conducted through a sensitivity analyses process on the finesses of meshing and loading incrementation. At the same time, the load-deformation data and the crack propagation of identical laboratory-tested elements were utilized for validation of the experimental data. It was proven that the developed model predicts the behavior of the beam to a high degree of correctness. The model can further be used as a tool for analyses in the field.
4.
Yanuar Haryanto And Hsuan-teh Hu And Ay L. Han And Fu-pei Hsiao And Nanang G. Wariyatno And Banu A. Hidayat
Numerical parametric study on the flexural capacity of reinforced concrete beams strengthened with non-metallic materials Journal Article
In: Journal of Engineering Science and Technology (JESTEC), 16 (4), pp. 3295 - 3311, 2021.
@article{95,
title = {Numerical parametric study on the flexural capacity of reinforced concrete beams strengthened with non-metallic materials},
author = {Yanuar Haryanto And Hsuan-teh Hu And Ay L. Han And Fu-pei Hsiao And Nanang G. Wariyatno And Banu A. Hidayat},
url = {https://hanaylie.id/wp-content/uploads/2021/08/16_4_37.pdf
http://jestec.taylors.edu.my/V16Issue4.htm},
year = {2021},
date = {2021-08-01},
journal = {Journal of Engineering Science and Technology (JESTEC)},
volume = {16},
number = {4},
pages = {3295 - 3311},
abstract = {A modified compression field theory and models developed with Response-2000 using the theory were applied to the prediction of the flexural capacity of reinforced concrete beams strengthened with the assistance of non-metallic material such as bamboo. Data were retrieved from earlier studies conducted in 2017 and two RC beams were used as specimens with one designed as the control beam (BC) while the other was strengthened through a near-surface mounted technique using four bamboo strips (BB). The study showed the accuracy of the models developed in predicting the responses of load-deflection up to the peak load, but underestimated figures were generally obtained from the predictions of beam ductility with an average of 34.41% difference. The models also provided conservative predictions of the flexural capacity for the beams with the ratios of 1.16 and 1.04 for BC and BB respectively. Moreover, the model developed was observed to be efficient in making quick and accurate predictions on the flexural strength based on a normalized mean square error (NMSE) of 0.006 and also has the ability to determine the conditions with the potential to cause the collapse of the reinforced concrete beams. Furthermore, the validated model was later used
to study the impact of bamboo diameter, concrete compressive strength, and steel reinforcement ratio on strengthened beams behaviour.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A modified compression field theory and models developed with Response-2000 using the theory were applied to the prediction of the flexural capacity of reinforced concrete beams strengthened with the assistance of non-metallic material such as bamboo. Data were retrieved from earlier studies conducted in 2017 and two RC beams were used as specimens with one designed as the control beam (BC) while the other was strengthened through a near-surface mounted technique using four bamboo strips (BB). The study showed the accuracy of the models developed in predicting the responses of load-deflection up to the peak load, but underestimated figures were generally obtained from the predictions of beam ductility with an average of 34.41% difference. The models also provided conservative predictions of the flexural capacity for the beams with the ratios of 1.16 and 1.04 for BC and BB respectively. Moreover, the model developed was observed to be efficient in making quick and accurate predictions on the flexural strength based on a normalized mean square error (NMSE) of 0.006 and also has the ability to determine the conditions with the potential to cause the collapse of the reinforced concrete beams. Furthermore, the validated model was later used
to study the impact of bamboo diameter, concrete compressive strength, and steel reinforcement ratio on strengthened beams behaviour.
to study the impact of bamboo diameter, concrete compressive strength, and steel reinforcement ratio on strengthened beams behaviour.
5.
Yanuar Haryanto; Hsuan-Teh Hu; Ay Lie Han; Fu-Pei Hsiao,Charng-Jen Teng; Banu Ardi Hidayat; Nanang Gunawan Wariyatno
Negative moment region flexural strengthening system of RC T-beams with half-embedded NSM FRP rods: a parametric analytical approach Journal Article
In: Journal of the Chinese Institute of Engineers , 2021, ISSN: 2158-7299.
@article{86,
title = {Negative moment region flexural strengthening system of RC T-beams with half-embedded NSM FRP rods: a parametric analytical approach},
author = {Yanuar Haryanto and Hsuan-Teh Hu and Ay Lie Han and Fu-Pei Hsiao,Charng-Jen Teng and Banu Ardi Hidayat and Nanang Gunawan Wariyatno},
url = {https://www.tandfonline.com/doi/full/10.1080/02533839.2021.1936646},
doi = {https://doi.org/10.1080/02533839.2021.1936646},
issn = {2158-7299},
year = {2021},
date = {2021-06-21},
journal = {Journal of the Chinese Institute of Engineers },
abstract = {Fiber Reinforced Polymer (FRP) rods are considered to be the most effective in retrofitting to increase the strength of reinforced concrete (RC) structures through Near-Surface Mounted (NSM) technique. There are, however, frequent cases encountered by engineers where the embedment depth mandated by ACI 440.2 R-08 code is not achievable in the field implementation. It has also been discovered that it is more challenging to strengthen the negative moment region of concrete members in comparison with the positive region. This research was conducted to determine the behavior of RC T-beams strengthened in the negative moment region using half-embedded NSM FRP rods. The findings were associated with the Modified Compression Field Theory (MCFT) which was applied in the analytical models. The model proposed was validated through a comparison with previous experimental study that showed half-embedded NSM FRP was effective as another method in comparison with the conventional soffit strengthening systems in retrofitting RC T-beams in the negative moment region, and good agreement was obtained. After that, a parametric analysis was initiated to determine the influence of FRP rod diameters, the compressive strength of concretes, the ratio of steel reinforcement as well as the materials used for the FRP on the flexural behavior of strengthened beams.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Fiber Reinforced Polymer (FRP) rods are considered to be the most effective in retrofitting to increase the strength of reinforced concrete (RC) structures through Near-Surface Mounted (NSM) technique. There are, however, frequent cases encountered by engineers where the embedment depth mandated by ACI 440.2 R-08 code is not achievable in the field implementation. It has also been discovered that it is more challenging to strengthen the negative moment region of concrete members in comparison with the positive region. This research was conducted to determine the behavior of RC T-beams strengthened in the negative moment region using half-embedded NSM FRP rods. The findings were associated with the Modified Compression Field Theory (MCFT) which was applied in the analytical models. The model proposed was validated through a comparison with previous experimental study that showed half-embedded NSM FRP was effective as another method in comparison with the conventional soffit strengthening systems in retrofitting RC T-beams in the negative moment region, and good agreement was obtained. After that, a parametric analysis was initiated to determine the influence of FRP rod diameters, the compressive strength of concretes, the ratio of steel reinforcement as well as the materials used for the FRP on the flexural behavior of strengthened beams.
6.
Nanang Gunawan Wariyatno; Han Ay Lie; Fu-Pei Hsiao; Buntara Sthenly Gan
Design Philosophy for Buildings’ Comfort-Level Performance Journal Article
In: Advances in Technology Innovation, 6 (3), pp. 157 - 168, 2021.
@article{85,
title = {Design Philosophy for Buildings’ Comfort-Level Performance},
author = {Nanang Gunawan Wariyatno and Han Ay Lie and Fu-Pei Hsiao and Buntara Sthenly Gan},
url = {https://ojs.imeti.org/index.php/AITI/article/view/7309},
doi = {https://doi.org/10.46604/aiti.2021.7309},
year = {2021},
date = {2021-05-27},
journal = {Advances in Technology Innovation},
volume = {6},
number = {3},
pages = {157 - 168},
abstract = {The data reported by Japan Meteorological Agency (JMA) show that the fatal casualties and severe injuries are due to heavy shaking during massive earthquakes. Current earthquake-resistant building standards do not include comfort-level performance. Hence, a new performance design philosophy is proposed in this research to evaluate the quantitative effect of earthquake-induced shaking in a building. The earthquake-induced response accelerations in a building are analysed, and the response accelerations related with the characteristic property of the building are used to evaluate the number of Seismic Intensity Level (SIL). To show the indispensability of the newly proposed comfort-level design philosophy, numerical simulations are conducted to evaluate the comfort level on different floors in a building. The results show that the evaluation of residents’ comfort levels should be considered in the current earthquake-resistant building design codes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The data reported by Japan Meteorological Agency (JMA) show that the fatal casualties and severe injuries are due to heavy shaking during massive earthquakes. Current earthquake-resistant building standards do not include comfort-level performance. Hence, a new performance design philosophy is proposed in this research to evaluate the quantitative effect of earthquake-induced shaking in a building. The earthquake-induced response accelerations in a building are analysed, and the response accelerations related with the characteristic property of the building are used to evaluate the number of Seismic Intensity Level (SIL). To show the indispensability of the newly proposed comfort-level design philosophy, numerical simulations are conducted to evaluate the comfort level on different floors in a building. The results show that the evaluation of residents’ comfort levels should be considered in the current earthquake-resistant building design codes.
7.
Banu A. Hidayat; Hsuan-Teh Hu; Fu-Pei Hsiao; Ay Lie Han; Lisha Sosa; Li-Yin Chan; Yanuar Haryanto
Seismic behavior and failure modes of non-ductile three-story reinforced concrete structure: A numerical investigation Journal Article
In: Computers and Concrete, 27 (5), pp. 457-472, 2021.
@article{84b,
title = {Seismic behavior and failure modes of non-ductile three-story reinforced concrete structure: A numerical investigation},
author = {
Banu A. Hidayat and Hsuan-Teh Hu and Fu-Pei Hsiao and Ay Lie Han and Lisha Sosa and Li-Yin Chan and Yanuar Haryanto},
url = {http://www.techno-press.org/content/?page=article&journal=cac&volume=27&num=5&ordernum=6},
doi = {http://dx.doi.org/10.12989/cac.2021.27.5.457},
year = {2021},
date = {2021-05-05},
journal = {Computers and Concrete},
volume = {27},
number = {5},
pages = {457-472},
abstract = {Reinforced concrete (RC) buildings in Taiwan have suffered failure from strong earthquakes, which was magnified by the non-ductile detailing frames. Inadequate reinforcement as a consequence of the design philosophy prior to the introduction of current standards resulted in severe damage in the column and beam-column joint (BCJ). This study establishes a finite element analysis (FEA) of the non-ductile detailing RC column, BCJ, and three-story building that was previously tested through a tri-axial shaking table test. The results were then validated to laboratory specimens having the exact same dimensions and properties. FEA simulation integrates the concrete damage plasticity model and the elastic-perfectly plastic model for steel. The load-displacement responses of the column and BCJ specimens obtained from FEA were in a reasonable agreement with the experimental curves. The resulting initial stiffness and maximum base shear were found to be a close approximation to the experimental results. Also, the findings of a dynamic analysis of the three-story building showed that the time-history data of acceleration and displacement correlated well with the shaking table test results. This indicates the FEA implementation can be effectively used to predict the RC frame performance and failure mode under seismic loads.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Reinforced concrete (RC) buildings in Taiwan have suffered failure from strong earthquakes, which was magnified by the non-ductile detailing frames. Inadequate reinforcement as a consequence of the design philosophy prior to the introduction of current standards resulted in severe damage in the column and beam-column joint (BCJ). This study establishes a finite element analysis (FEA) of the non-ductile detailing RC column, BCJ, and three-story building that was previously tested through a tri-axial shaking table test. The results were then validated to laboratory specimens having the exact same dimensions and properties. FEA simulation integrates the concrete damage plasticity model and the elastic-perfectly plastic model for steel. The load-displacement responses of the column and BCJ specimens obtained from FEA were in a reasonable agreement with the experimental curves. The resulting initial stiffness and maximum base shear were found to be a close approximation to the experimental results. Also, the findings of a dynamic analysis of the three-story building showed that the time-history data of acceleration and displacement correlated well with the shaking table test results. This indicates the FEA implementation can be effectively used to predict the RC frame performance and failure mode under seismic loads.
8.
Nanang Gunawan Wariyatno; Yanuar Haryanto; Ay Lie Han; Buntara Sthenly Gan; Gathot Heri Sudibyo
Load-carrying capacity and failure mode of composite steel-concrete truss element under monotonic loading Journal Article
In: IOP Conference Series: Materials Science and Engineering, 982 (012032), pp. 1-6, 2021, ISSN: 1757-899X.
@article{81b,
title = {Load-carrying capacity and failure mode of composite steel-concrete truss element under monotonic loading},
author = {Nanang Gunawan Wariyatno and Yanuar Haryanto and Ay Lie Han and Buntara Sthenly Gan and Gathot Heri Sudibyo},
url = {https://iopscience.iop.org/article/10.1088/1757-899X/982/1/012032},
doi = {https://doi.org/10.1088/1757-899X/982/1/012032},
issn = {1757-899X},
year = {2021},
date = {2021-05-01},
journal = {IOP Conference Series: Materials Science and Engineering},
volume = {982},
number = {012032},
pages = {1-6},
abstract = {Composite steel-concrete trusses are among the most economical systems for building, particularly for greater spans, allowing proper internal space utilization without limiting columns. This paper examines 12 lab tests on two types of composite steel-concrete truss elements compared with the conventional steel truss element as a control specimen. The experiments investigate the load-carrying capacity of the truss element with different configurations under monotonic loading. The study on the specimen's failure modes was based on the welded joints. The obtained results were compared with analytical evaluations of typical resisting mechanisms of steel-concrete composite, reinforced concrete, and steel structures with updated Indonesian design codes. The basic features of the steel-concrete truss elements discussed quantitatively and qualitatively.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Composite steel-concrete trusses are among the most economical systems for building, particularly for greater spans, allowing proper internal space utilization without limiting columns. This paper examines 12 lab tests on two types of composite steel-concrete truss elements compared with the conventional steel truss element as a control specimen. The experiments investigate the load-carrying capacity of the truss element with different configurations under monotonic loading. The study on the specimen's failure modes was based on the welded joints. The obtained results were compared with analytical evaluations of typical resisting mechanisms of steel-concrete composite, reinforced concrete, and steel structures with updated Indonesian design codes. The basic features of the steel-concrete truss elements discussed quantitatively and qualitatively.
9.
Han Ay Lie; Junaedi Utomo; Hsuan-Teh Hu; Lena Tri Lestari
Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures Journal Article
In: Civil Engineering Dimension, 23 (1), pp. 9-19, 2021, ISSN: 1410-9530.
@article{82,
title = {Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures},
author = {Han Ay Lie and Junaedi Utomo and Hsuan-Teh Hu and Lena Tri Lestari},
url = {https://ced.petra.ac.id/index.php/civ/article/view/23577},
doi = {https://doi.org/10.9744/ced.23.1.9-19},
issn = {1410-9530},
year = {2021},
date = {2021-04-20},
journal = {Civil Engineering Dimension},
volume = {23},
number = {1},
pages = {9-19},
abstract = {A resilience and seismic safety evaluation method of under-qualified concrete structures designed based on codes prior to the introduction of earthquake provisions is presented. A numerical method for evaluating and improving a structure’s performance and resilience through jacketing and Carbon Fiber Reinforced Polymers (CFRP) retrofitting was developed. The model analyzed the structure’s existing condition, inadequate elements were identified, and segments that required strengthening were determined. Retrofitting and external reinforcing techniques were applied, and their effectiveness evaluated. Elements identified as insufficient were subjected to a strengthening iteration process to ensure that all qualifications were fulfilled. It was proven that the numerical simulation was accurate, cost-effective and time-saving in evaluating deficient structures and the effectiveness of their strengthening methods. The numerical model and analysis in conjunction with the technology of jacketing and CFRP retrofitting provide a fast and straightforward solution for older structures in ameliorating their resilience and overall performance},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A resilience and seismic safety evaluation method of under-qualified concrete structures designed based on codes prior to the introduction of earthquake provisions is presented. A numerical method for evaluating and improving a structure’s performance and resilience through jacketing and Carbon Fiber Reinforced Polymers (CFRP) retrofitting was developed. The model analyzed the structure’s existing condition, inadequate elements were identified, and segments that required strengthening were determined. Retrofitting and external reinforcing techniques were applied, and their effectiveness evaluated. Elements identified as insufficient were subjected to a strengthening iteration process to ensure that all qualifications were fulfilled. It was proven that the numerical simulation was accurate, cost-effective and time-saving in evaluating deficient structures and the effectiveness of their strengthening methods. The numerical model and analysis in conjunction with the technology of jacketing and CFRP retrofitting provide a fast and straightforward solution for older structures in ameliorating their resilience and overall performance
10.
Yanuar Haryanto; Hsuan-Teh Hu; Ay Lie Han; Fu-Pei Hsiao; Charng-Jen Teng; Banu Ardi Hidayat; Laurencius Nugroho
Nonlinear 3D Model of Double Shear Lap Tests for the Bond of Near-surface Mounted FRP Rods in Concrete Considering Different Embedment Depth Journal Article
In: Periodica Polytechnica Civil Engineering, 65 (3), pp. 878–889, 2021, ISSN: 1587-3773.
@article{88,
title = {Nonlinear 3D Model of Double Shear Lap Tests for the Bond of Near-surface Mounted FRP Rods in Concrete Considering Different Embedment Depth},
author = {Yanuar Haryanto and Hsuan-Teh Hu and Ay Lie Han and Fu-Pei Hsiao and Charng-Jen Teng and Banu Ardi Hidayat and Laurencius Nugroho},
url = {https://pp.bme.hu/ci/article/view/17309},
doi = {https://doi.org/10.3311/PPci.17309},
issn = {1587-3773},
year = {2021},
date = {2021-04-06},
journal = {Periodica Polytechnica Civil Engineering},
volume = {65},
number = {3},
pages = {878–889},
abstract = {The utilization of near-surface mounted Fiber Reinforced Polymer (FRP) reinforcement as a method of strengthening in reinforced concrete structures has increased considerably in recent years. Moreover, the application of double-shear lap tests for this rein- forcement method leads to the achievement of a local bond-slip behavior in a bonded joint. This research, therefore, focused on 3-D modeling of this type of test to suitably characterize the bond mechanics between FRP rods and concrete at various embedment depth. The use of different alternatives to represent the interface between the FRP rod and concrete were analyzed after which a comparison was drawn between the numerical finite element (FE) simulations and experimental measurements. The results showed the prediction of the load–slip corresponded with the data obtained from the experiment. Finally, the proposed model has the ability to express the relationship between the penalty stiffness parameters in shear direction Kss = (Ktt) and the embedment depth of FRP rods.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The utilization of near-surface mounted Fiber Reinforced Polymer (FRP) reinforcement as a method of strengthening in reinforced concrete structures has increased considerably in recent years. Moreover, the application of double-shear lap tests for this rein- forcement method leads to the achievement of a local bond-slip behavior in a bonded joint. This research, therefore, focused on 3-D modeling of this type of test to suitably characterize the bond mechanics between FRP rods and concrete at various embedment depth. The use of different alternatives to represent the interface between the FRP rod and concrete were analyzed after which a comparison was drawn between the numerical finite element (FE) simulations and experimental measurements. The results showed the prediction of the load–slip corresponded with the data obtained from the experiment. Finally, the proposed model has the ability to express the relationship between the penalty stiffness parameters in shear direction Kss = (Ktt) and the embedment depth of FRP rods.