| 1. |  | Nuroji, Nuroji; Hung, Chung-Chan; Prasetya, Blinka Hermawan; Han, Aylie: The Behavior of Reinforced Concrete Members with Section Enlargement Using Self-Compacting Concrete. In: IRECE, 11 (3), 2020, ISSN: 2036-9913 . (Type: Journal Article | Abstract | Links)@article{63b,
title = {The Behavior of Reinforced Concrete Members with Section Enlargement Using Self-Compacting Concrete},
author = {Nuroji Nuroji and Chung-Chan Hung and Blinka Hermawan Prasetya and Aylie Han},
url = {https://www.praiseworthyprize.org/jsm/index.php?journal=irece&page=article&op=view&path%5B%5D=24440},
issn = {2036-9913 },
year = {2020},
date = {2020-07-07},
journal = {IRECE},
volume = {11},
number = {3},
abstract = {This paper presents the experimental results of section enlargement effects on prismatic reinforced concrete members. 125 by 200 mm reinforced concrete members with a compressive strength of 20.3 MPa reinforced with D12 steel bars having a yield stress of 335 MPa situated in the tension and compression area, were produced. Two specimens were prepared, the first functioning as the control element and designated as the control beam (CB). The second strengthened with a section enlargement using self-compacting concrete (SCC) marked as the strengthened beam (SB). The SCC had a 28-day compressive strength of 23.9 MPa. The dimensions of the enlarged beam were 200 by 300 mm. The two specimens CB and SB were tested with a two-point loading system. Based on the tests data, the load–displacement and moment–curvature relationships characterizing the beams were generated. From the results it was concluded that the enlargement affected the load-carrying capacity and stiffness positively. The SB member had a six times higher moment capacity, while the stiffness performance was enhanced seven times when compared to the CB specimen. On the other hand, it was also demonstrated that the ductility of the SB decreased as a consequence of the increase in span-to-depth ratio. The study was expanded based on the rational analyses to evaluate the influence of the additional tensile steel and concrete strength ratio of the enlarged section.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper presents the experimental results of section enlargement effects on prismatic reinforced concrete members. 125 by 200 mm reinforced concrete members with a compressive strength of 20.3 MPa reinforced with D12 steel bars having a yield stress of 335 MPa situated in the tension and compression area, were produced. Two specimens were prepared, the first functioning as the control element and designated as the control beam (CB). The second strengthened with a section enlargement using self-compacting concrete (SCC) marked as the strengthened beam (SB). The SCC had a 28-day compressive strength of 23.9 MPa. The dimensions of the enlarged beam were 200 by 300 mm. The two specimens CB and SB were tested with a two-point loading system. Based on the tests data, the load–displacement and moment–curvature relationships characterizing the beams were generated. From the results it was concluded that the enlargement affected the load-carrying capacity and stiffness positively. The SB member had a six times higher moment capacity, while the stiffness performance was enhanced seven times when compared to the CB specimen. On the other hand, it was also demonstrated that the ductility of the SB decreased as a consequence of the increase in span-to-depth ratio. The study was expanded based on the rational analyses to evaluate the influence of the additional tensile steel and concrete strength ratio of the enlarged section. |
| 2. |  | Paulus Wisnu Anggoro Abet Adhy Anthony, Mohammad Tauviqirrahman Jamari Athanasius Priharyoto Bayuseno Aylie Han : Machining Parameter Optimization of EVA Foam Orthotic Shoe Insoles. In: International Journal of Engineering and Technology Innovation, 10 (3), 2020, ISSN: 2226-809X. (Type: Journal Article | Abstract | Links)@article{62b,
title = {Machining Parameter Optimization of EVA Foam Orthotic Shoe Insoles},
author = {Paulus Wisnu Anggoro, Abet Adhy Anthony, Mohammad Tauviqirrahman, Jamari, Athanasius Priharyoto Bayuseno, Aylie Han},
url = {http://ojs.imeti.org/index.php/IJETI/article/view/ijeti.2020.5099/968
http://ojs.imeti.org/index.php/IJETI/issue/view/87
http://ojs.imeti.org/index.php/IJETI/article/view/ijeti.2020.5099},
doi = {https://doi.org/10.46604/ijeti.2020.5099},
issn = {2226-809X},
year = {2020},
date = {2020-07-01},
journal = {International Journal of Engineering and Technology Innovation},
volume = {10},
number = {3},
abstract = {In this study, ethylene-vinyl acetate (EVA) foam orthotic shoe insoles with different surface roughnesses (Ra)
are investigated in terms of CNC milling strategy. Based on a hybrid Taguchi-response surface methodology
(TM-RSM) approach, machining parameters, including tool path strategy, spindle speed, feed rate, and step over, as
well as material hardness, are of particular interest. The main aim of this work is to develop mathematical models
and determine the optimum machining parameters. Experiments are conducted on a CNC milling machine with a
standard milling cutter and run under dry coolants. The optimal conditions are established based on TM and then
used to determine the optimum values in the RSM modeling. The main finding of the present work is that there are
significant improvements in the Ra, by up 0.24% and 4.13%, and machining time, by up 0.43% and 0.41%, obtained
with TM-RSM in comparison to TM analysis.
},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this study, ethylene-vinyl acetate (EVA) foam orthotic shoe insoles with different surface roughnesses (Ra)
are investigated in terms of CNC milling strategy. Based on a hybrid Taguchi-response surface methodology
(TM-RSM) approach, machining parameters, including tool path strategy, spindle speed, feed rate, and step over, as
well as material hardness, are of particular interest. The main aim of this work is to develop mathematical models
and determine the optimum machining parameters. Experiments are conducted on a CNC milling machine with a
standard milling cutter and run under dry coolants. The optimal conditions are established based on TM and then
used to determine the optimum values in the RSM modeling. The main finding of the present work is that there are
significant improvements in the Ra, by up 0.24% and 4.13%, and machining time, by up 0.43% and 0.41%, obtained
with TM-RSM in comparison to TM analysis.
|
| 3. |  | Kiryu, S; Alisjahbana, S W; Alisjahbana, I; Han, A L; Gan, B S: Free vibration of orthotropic Levy-type solution plates by using SEM. 7th International Conference on Euro Asia Civil Engineering Forum
30 September to 2 October 2019, Stuttgart, Germany, 615 , IOP Conference Series: Materials Science and Engineering, 2019. (Type: Conference | Abstract | Links)@conference{68,
title = {Free vibration of orthotropic Levy-type solution plates by using SEM},
author = {S Kiryu and S W Alisjahbana and I Alisjahbana and A L Han and B S Gan},
url = {https://hanaylie.id/kiryu-eacef/
https://iopscience.iop.org/article/10.1088/1757-899X/615/1/012081},
doi = {10.1088/1757-899X/615/1/012081},
year = {2019},
date = {2019-10-15},
booktitle = {7th International Conference on Euro Asia Civil Engineering Forum
30 September to 2 October 2019, Stuttgart, Germany},
volume = {615},
publisher = {IOP Conference Series: Materials Science and Engineering},
abstract = {Orthotropic Levy-type solution plates considering shear deformation were solved by using the Spectral Element Method (SEM). In SEM, the exact solution of structural dynamic related problems can be solved by using the frequency-dependent shape functions. The solutions of SEM are accurate in decreasing the amount of Degree Of Freedoms (DOF) to discard the cost and computational disadvantages in the Finite Element Method (FEM). This study investigates the free vibration problems of orthotropic Levy-type solution plates solutions based on the two variable Refined Plate Theory (RPT). SEM for orthotropic Levy-type solution plates in the frequency domain was formulated to solve free vibration problems. The differential governing equations of the orthotropic plate element in SEM are formulated into the form of transcendental stiffness matrices. The boundary conditions of the spectral element model consist of four edgetype DOFs at each side of the orthotropic Levy-type solution plates. The natural frequencies of the plate are calculated by means of the Wittrick-Williams procedure. The numerical investigations are presented to show the accuracy, efficiency, and effectiveness of SEM without any discretization scheme.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Orthotropic Levy-type solution plates considering shear deformation were solved by using the Spectral Element Method (SEM). In SEM, the exact solution of structural dynamic related problems can be solved by using the frequency-dependent shape functions. The solutions of SEM are accurate in decreasing the amount of Degree Of Freedoms (DOF) to discard the cost and computational disadvantages in the Finite Element Method (FEM). This study investigates the free vibration problems of orthotropic Levy-type solution plates solutions based on the two variable Refined Plate Theory (RPT). SEM for orthotropic Levy-type solution plates in the frequency domain was formulated to solve free vibration problems. The differential governing equations of the orthotropic plate element in SEM are formulated into the form of transcendental stiffness matrices. The boundary conditions of the spectral element model consist of four edgetype DOFs at each side of the orthotropic Levy-type solution plates. The natural frequencies of the plate are calculated by means of the Wittrick-Williams procedure. The numerical investigations are presented to show the accuracy, efficiency, and effectiveness of SEM without any discretization scheme. |
| 4. |  | Hidayat, B A; Hu, H-T; Han, A L; Haryanto, Y; Widyaningrum, A; Pamudji, G: Nonlinear finite element analysis of traditional flexural strengthening using betung bamboo (Dendrocalamus asper) on concrete beams. 7th International Conference on Euro Asia Civil Engineering Forum
30 September to 2 October 2019, Stuttgart, Germany, 615 , IOP Conference Series: Materials Science and Engineering, 2019. (Type: Conference | Abstract | Links)@conference{67,
title = {Nonlinear finite element analysis of traditional flexural strengthening using betung bamboo (Dendrocalamus asper) on concrete beams},
author = {B A Hidayat and H-T Hu and A L Han and Y Haryanto and A Widyaningrum and G Pamudji},
url = {https://hanaylie.id/hidayat-eacef/},
doi = {10.1088/1757-899X/615/1/012073},
year = {2019},
date = {2019-10-15},
booktitle = {7th International Conference on Euro Asia Civil Engineering Forum
30 September to 2 October 2019, Stuttgart, Germany},
volume = {615},
publisher = {IOP Conference Series: Materials Science and Engineering},
abstract = {Structural failure, which can be caused by design miscalculation or changes in the building’s function, can be dangerous if left untreated. Consequently, structural strengthening is done by providing steel plates, fiber-reinforced-polymer, or in the traditional way using bamboo fibers. In this study, a numerical calculation for bamboo strengthening using the FEM method is conducted. Bamboo strengthening was installed on concrete beams and attached using mortar. The analysis was carried out with ATENA software dealing with beam specimens, namely Control Beam (BC) and Bamboo-strengthened Beam using M13 and M20 mortar (BB13 and BB20). The materials used are CC3DNonLinCementitious2 and CCD3DBiLinearSteelVonMises for concrete and bamboo, respectively. The concrete and mortar use the fracture concept of a uniaxial stress-strain law and the constitutive model of the bamboo is based on a linear stress-strain law. The results of comparing the numerical and experimental results for the load-carrying capacity ratio are 0.96, 0.90, 0.77 for BC, BB13, and BB20, respectively. The crack pattern of the specimens shows that collapse is by flexural cracking starting from the mid-span. This is in accordance with previous laboratory results. In conclusion, the analyses using ATENA program and experimental methods show the appropriate results.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Structural failure, which can be caused by design miscalculation or changes in the building’s function, can be dangerous if left untreated. Consequently, structural strengthening is done by providing steel plates, fiber-reinforced-polymer, or in the traditional way using bamboo fibers. In this study, a numerical calculation for bamboo strengthening using the FEM method is conducted. Bamboo strengthening was installed on concrete beams and attached using mortar. The analysis was carried out with ATENA software dealing with beam specimens, namely Control Beam (BC) and Bamboo-strengthened Beam using M13 and M20 mortar (BB13 and BB20). The materials used are CC3DNonLinCementitious2 and CCD3DBiLinearSteelVonMises for concrete and bamboo, respectively. The concrete and mortar use the fracture concept of a uniaxial stress-strain law and the constitutive model of the bamboo is based on a linear stress-strain law. The results of comparing the numerical and experimental results for the load-carrying capacity ratio are 0.96, 0.90, 0.77 for BC, BB13, and BB20, respectively. The crack pattern of the specimens shows that collapse is by flexural cracking starting from the mid-span. This is in accordance with previous laboratory results. In conclusion, the analyses using ATENA program and experimental methods show the appropriate results. |
| 5. |  | Haryanto, Y; Hu, H-T; Han, A L; Wariyatno, N G; Sudibyo, G H; Hidayat, B A; Naqiyah, K: Precast segmental bamboo reinforced concrete beams with bolted connections subjected to flexural loads: an experimental investigation. 7th International Conference on Euro Asia Civil Engineering Forum
30 September to 2 October 2019, Stuttgart, Germany, 615 , IOP Conference Series: Materials Science and Engineering, 2019. (Type: Conference | Abstract | Links)@conference{66,
title = {Precast segmental bamboo reinforced concrete beams with bolted connections subjected to flexural loads: an experimental investigation},
author = {Y Haryanto and H-T Hu and A L Han and N G Wariyatno and G H Sudibyo and B A Hidayat and K Naqiyah},
url = {https://hanaylie.id/haryanto-eacef/
https://iopscience.iop.org/article/10.1088/1757-899X/615/1/012070},
doi = {10.1088/1757-899X/615/1/012070},
year = {2019},
date = {2019-10-15},
booktitle = {7th International Conference on Euro Asia Civil Engineering Forum
30 September to 2 October 2019, Stuttgart, Germany},
volume = {615},
publisher = {IOP Conference Series: Materials Science and Engineering},
abstract = {Indonesia is one of the wealthiest botanically countries in the world. There are more than 130 species of Bamboo can be found in this country. Bamboo is a natural raw material which is one of the fastest growing plants that has many advantages as a construction material. We conducted an experimental investigation to study the performance of the precast segmental bamboo reinforced concrete beams with bolted connections subjected to flexural loads. Tests were carried out on three specimens with dimensions of 120 mm x 150 mm x 1000 mm, consisting of one control beams (BK), one precast segmental bamboo reinforced concrete beam with four bolted connections (BS4), and one precast segmental bamboo reinforced concrete beam with six bolted connections (BS6). We found that the load carrying capacity of precast segmental bamboo reinforced concrete beams with four bolted connections (BS4) and six bolted connections (BS6) had a decrease of 57.99% and 55.62% respectively compared to control beam (BK). Similarly, the deflection ductility index of the precast segmental bamboo reinforced concrete beams with four bolted connections (BS4) and six bolted connections (BS6) had a decrease of 49.78% and 46.59% respectively compared to control beam (BK). Also, we observed that the crack pattern developed in the control beam indicates a flexural failure mechanism while the crack pattern developed in the precast segmental bamboo reinforced concrete beams indicates a shear failure mechanism. As a conclusion, this study will significantly contribute to the growing development of research on the bolted connection system in bamboo reinforced concrete members, especially in Indonesia.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Indonesia is one of the wealthiest botanically countries in the world. There are more than 130 species of Bamboo can be found in this country. Bamboo is a natural raw material which is one of the fastest growing plants that has many advantages as a construction material. We conducted an experimental investigation to study the performance of the precast segmental bamboo reinforced concrete beams with bolted connections subjected to flexural loads. Tests were carried out on three specimens with dimensions of 120 mm x 150 mm x 1000 mm, consisting of one control beams (BK), one precast segmental bamboo reinforced concrete beam with four bolted connections (BS4), and one precast segmental bamboo reinforced concrete beam with six bolted connections (BS6). We found that the load carrying capacity of precast segmental bamboo reinforced concrete beams with four bolted connections (BS4) and six bolted connections (BS6) had a decrease of 57.99% and 55.62% respectively compared to control beam (BK). Similarly, the deflection ductility index of the precast segmental bamboo reinforced concrete beams with four bolted connections (BS4) and six bolted connections (BS6) had a decrease of 49.78% and 46.59% respectively compared to control beam (BK). Also, we observed that the crack pattern developed in the control beam indicates a flexural failure mechanism while the crack pattern developed in the precast segmental bamboo reinforced concrete beams indicates a shear failure mechanism. As a conclusion, this study will significantly contribute to the growing development of research on the bolted connection system in bamboo reinforced concrete members, especially in Indonesia. |
fib International Conference on Concrete Sustainability
