@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}
}

@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}
}

@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}
}

@conference{65b,
title = {Study of mechanical properties of fly ash-based geopolymer concrete},
author = {H Hardjasaputra and M Cornelia and Y Gunawan and I V Surjaputra and H A Lie and Rachmansyah and Pranata G Ng},
url = {https://hanaylie.id/hardjasaputra-eacef/
https://iopscience.iop.org/article/10.1088/1757-899X/615/1/012009},
doi = {10.1088/1757-899X/615/1/012009},
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},
number = {012009},
publisher = {IOP Conference Series: Materials Science and Engineering},
abstract = {The world is facing the challenges of climate changes due to the increase in CO2 emissions. Cement production is one of the biggest contributors to CO2 emissions due to combustion processes that require high temperatures. The new development in building construction showed that fly ash based Geopolymer concrete can be as structure materials to reduce or even eliminate ordinary Portland cement concrete. This paper presented the research results of fly ash based geopolymer concrete mechanical properties, like the compressive strength, flexural strength, and Elastic Modulus. The data were collected from the test results of geopolymer concrete specimens made from 2 sources of Fly Ash with varying concentration of sodium hydroxide solution from 4 M up to 12 M. The range of achieved compressive strength was from normal to high strength concrete. The correlation between the compressive strength and flexural strength and the Elastic Modulus of geopolymer concrete will be the highlight of this paper. The mathematical formulation of compressive strength and its flexural strength and Elastic modulus will be determined and compared with normal Portland Cement
Concrete.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}

@conference{64b,
title = {The effect of alkali concentration on chloride penetration in geopolymer concrete},
author = {J J Ekaputri and H A Lie and C Fujiyama and M Shovitri and N H Alami and D H E
Setiamarga},
url = {https://hanaylie.id/ekaputri-eacef/
https://iopscience.iop.org/article/10.1088/1757-899X/615/1/012114},
doi = {10.1088/1757-899X/615/1/012114},
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},
number = {012114},
pages = {1-12},
publisher = {IOP Conference Series: Materials Science and Engineering},
abstract = {This paper presents the experimental study on the penetration of chloride ions in fly ash based-geopolymer concrete in the salt-water. To determine the corrosion possibility of reinforcement, lollipop-shape specimens with the size of 10x10x15 cm were prepared with the plain steel bar in the middle of concrete. The specimens were exposed to chloride ion penetration for 30-120 days. The mixtures were varied with alkali concentration of 8M-12M with the mass ratio of Na2SiO3 to NaOH was varied from 1.5 to 2.5. Specimens made with portland cement concrete was also prepared as the control. The best performance was showed by specimens made with 12M of NaOH. Due to ion exchange on the surface of geopolymer concrete, less chloride ion was found in geopolymer made with high alkali concentration. After 90 days, Portland cement concrete showed less performance while geopolymer concrete showed the strength increasing. High binding capacity due to soluble silicate content in geopolymer concrete was one of the reasons why geopolymer specimens are more resistant to chloride ion penetration.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}