@article{85,
title = {Enhancement of flexural performance of RC beams with steel wire rope by external strengthening technique},
author = {Yanuar Haryanto and Ay Lie Han and Hsuan-Teh Hu and Fu-Pei Hsiao and Banu Ardi Hidayat and Arnie Widyaningrum},
url = {https://www.tandfonline.com/doi/full/10.1080/02533839.2021.1871651},
doi = {https://doi.org/10.1080/02533839.2021.1871651},
year = {2021},
date = {2021-02-02},
journal = {Journal of the Chinese Institute of Engineers},
abstract = {Reinforced concrete structures around the world need repairing or strengthening at some stage in their lifetimes for different reasons. Steel wire rope is one of the potential materials to strengthen reinforced concrete structures do to its high strength, lightweight, and high flexibility properties. This research was, therefore, conducted to investigate a relatively new technique to strengthen reinforced concrete beams using external steel wire ropes. This involved testing five beam specimens under a four-point bending configuration for failure, and the strengthening effects of external wire ropes on their performance were also studied. The results showed the ultimate load capacity was also significantly enhanced up to 250% compared to the control specimen. Moreover, the stiffness and energy absorption capacity of the strengthened specimens were improved due to the external strengthening technique. This means reinforced concrete beams strengthened with external steel wire rope are capable of fulfilling the flexural performance required for reinforced concrete structures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{84,
title = {Investigation on Structural Behaviour of Bamboo Reinforced Concrete Slabs under Concentrated Load},
author = {Yanuar Haryanto and Nanang Gunawan Wariyatno and Hsuan-Teh Hu and Ay Lie Han and Banu Ardi Hidayat},
url = {http://www.ukm.my/jsm/pdf_files/SM-PDF-50-1-2021/22.pdf
},
doi = {http://dx.doi.org/10.17576/jsm-2021-5001-22},
year = {2021},
date = {2021-01-30},
journal = {journal of Sains Malaysiana (SCI)},
volume = {50},
number = {1},
pages = {227-238},
abstract = {Reinforced concrete is perhaps the most widely used building material in the world. However, the materials used
for reinforcement of concrete i.e. steel is quite expensive and scarcely available in the developing world. As a result,
bamboo is considered to be a cheaper replacement with high tensile strength. This research investigated the structural
behaviour of bamboo-reinforced concrete slabs used for footplate foundation subjected to concentrated load. For
this purpose, four different reinforced concrete slab panels were developed and analyzed. The influence of replacing
steel with bamboo for the reinforcement of concrete slabs on their structural behaviour was assessed by determining
the load-deflection characteristics, the ultimate load, the stiffness, the ductility, the cracking pattern, and the energy
absorption capacity. The results showed that in comparison to steel reinforced concrete slabs, the strength of 82% can
be acquired by the bamboo reinforced slabs. Furthermore, ductility demonstrated by the two types of specimens was
almost equivalent i.e. up to 93%. Those indicated that the structural behaviour demonstrated by bamboo reinforced
slabs is quite comparable to that of steel reinforced concrete slabs. Therefore, bamboo can prove to be a promising
substitute for steel in concrete reinforcement. Future studies may further examine this opportunity},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{79b,
title = {Flexural strength of concrete-galvalume composite beam under elevated temperatures},
author = {Agus Maryoto and Han Ay Lie and Hendrik Marius Jonkers},
url = {http://www.techno-press.org/?page=container&journal=cac&volume=27&num=1},
year = {2020},
date = {2020-12-03},
journal = {Computers and Concrete},
volume = {27},
number = {1},
pages = {13-20},
abstract = {In this paper, the elevated temperature on a concrete-galvalume composite beam's flexural strength based on the numerical and experimental methods is investigated. The strategy is to perform modeling and simulation of the flexural test based on finite element method (FEM) at room temperature and validate its results by using experiments at the same temperature. With material constants and boundary conditions set-up provided from the validation, we model and simulate the same flexural tests for the composite at higher temperatures. The study concludes that the flexural strength of the beam decreases at higher temperature. Additionally, it was shown that cracking moments is very sensitive to the temperature fluctuation and the failure modes are sensitive with respect to the elevated temperature.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{79,
title = {Seismic performance of non-ductile detailing RC frames: An experimental investigation},
author = {Banu A. Hidayat and Hsuan-Teh Hu and Fu-Pei Hsiao and Ay Lie Han and Panapa Pita and Yanuar Haryanto
},
url = {http://www.techno-press.org/content/?page=article&journal=eas&volume=19&num=6&ordernum=6
http://dx.doi.org/10.12989/eas.2020.19.6.485},
year = {2020},
date = {2020-12-01},
journal = {Earthquakes and Structures},
volume = {19},
number = {6},
pages = {485-498},
abstract = {Non-ductile detailing of Reinforced Concrete (RC) frames may lead to structural failure when the structure is subjected to earthquake response. These designs are generally encountered in older RC frames constructed prior to the introduction of the ductility aspect. The failure observed in the beam–column joints (BCJs) and accompanied by excessive column damage. This work examines the seismic performance and failure mode of non-ductile designed RC columns and exterior BCJs. The design was based on the actual building in Tainan City, Taiwan, that collapsed due to the 2016 Meinong earthquake. Hence, an experimental investigation using cyclic testing was performed on two columns and two BCJ specimens scaled down to 50%. The experiment resulted in a poor response in both specimens. Excessive cracks and their propagation due to the incursion of the lateral loads could be observed close to the top and bottom of the specimens. Joint shear failure appeared in the joints. The ductility of the member was below the desired value of 4. This is the minimum number required to survive an earthquake with a similar magnitude to that of El Centro. The evidence provides an understanding of the seismic failure of poorly detailed RC frame structures.
},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{81,
title = {Studi Penggunaan Semen Slag sebagai Substitusi Semen Portland pada Beton},
author = {Bagus Hario Setiadji and Hariadi Dewabrata and Han Ay Lie and Sie Alexander P. },
url = {https://journal.unilak.ac.id/index.php/SIKLUS/article/view/4595
https://doi.org/10.31849/siklus.v6i2.4595},
issn = {2549- 3973},
year = {2020},
date = {2020-10-01},
journal = {Jurnal Teknik Sipil Siklus},
volume = {6},
number = {2},
pages = {117 - 128},
abstract = {Era kini ditandai dengan penekanan pada konsevasi energi, beton ramah lingkungan dan beton hijau. Semen merupakan bahan utama pembentuk beton, dan juga penyumbang pencemaran udara terbesar di antara bahan penyusun material tersebut. Semen slag atau Ground Granulated Blast Furnace Slag (GGBFS) yang merupakan hasil pengolahan limbah industri baja menjadi salah satu alternatif yang diminati karena proses produksi dan lebih ekonomis bila dibandingkan dengan Portland Cement (PC). Material yang mempunyai sifat cementitious ini berpotensi untuk menggantikan sebagian semen dalam campuran beton dengan tetap mempertahankan kelebihan sifat mekanis beton. Penelitian ini dilakukan di laboratorium dengan pengujian benda uji yang telah didesain dengan komposisi substitusi semen slag sebesar 0%, 10%, 20%, 30%, 40%, dan 50% dari berat semen yang dibutuhkan dan pada umur 28 hari. Sebagai benda uji kontrol beton direncanakan dengan kuat tekan f’c = 38 MPa. Semen slag yang digunakan berdasarkan referensi memiliki activity index grade 80. Penelitian dilakukan untuk mengetahui kinerja semen slag pada beton melalui pengamatan kuat tekan (f’c), hubungan tegangan-regangan (fc - ε) dan modulus elastisitas (E) beton. Pengujian menunjukkan bahwa substitusi slag menyebabkan terjadinya penurunan kuat tekan beton, regangan dan modulus elastisitas pada umur 28 hari karena adanya proses kimia yang lebih lamban daripada PC.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{75b,
title = {An Innovation Value Chain in Project Based Companies: A Study of Indonesian Contractors},
author = {Harijanto Setiawan and Ferianto Raharjo and Ay Lie Han},
url = {http://ced.petra.ac.id/index.php/civ/article/view/22997
https://doi.org/10.9744/ced.22.2.98-104},
issn = {1410-9530},
year = {2020},
date = {2020-09-01},
journal = {Civil Engineering Dimension},
volume = {22},
number = {2},
pages = {101-108},
abstract = {Innovation is one of the key success factors of contractors to achieve sustainable business. However, studies about innovation cannot be generalized to all business sectors. Therefore, special study about innovation that focuses on contractors in Indonesia is needed. The study is aimed to explore the process of innovation development in contractors, based on innovation value chain (IVC) approach. The qualitative analysis on the data that is collected from in depth interview with top managers of big contractors in Indonesia is carried out. This study found that innovations are generated mainly by project teams because they are involved directly in the project activities. The next phase is to test the idea of innovation in the selected projects in order to assess whether the innovation works well or not. Finally, the selected innovations will be set as a company standard and will be implemented in the subsequent projects.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{65c,
title = {Kajian dan Evaluasi Struktur Slab Prestressed Precast Modular Concrete},
author = {I Gusti Lanang Bagus Eratodi, Ali Awaludin, Ay Lie Han, Andreas Triwiyono},
url = {https://ejournal.undip.ac.id/index.php/mkts/article/view/27765
https://doi.org/10.14710/mkts.v26i1.27765},
year = {2020},
date = {2020-07-30},
journal = {Media Komunikasi Teknik Sipil},
volume = {11},
number = {3},
abstract = {Slab prestressed precast modular concrete berfungsi rigid pavement, mendukung beban kendaraan di atasnya pada tanah dasar yang daya dukungnya relatif rendah. Slab ini berukuran 2000 x 850 x 150 mm3 dari beton bertulang biasa (produksi lama) atau beton pretension (produksi baru) mutu beton K-500. Dalam pemakaian di lapangan slab ini diharapkan dapat dipasang dan dilepas berulangkali. Setelah beberapa kali pemakaian, terjadi kerusakan terutama pada bagian ujung slab berupa spalling. Tujuan kajian dan evaluasi struktur ini adalah: (1) mengamati kerusakan; (2) mendapatkan data kualitas bahan; (3) melakukan pemodelan secara numeris dengan memperhatikan sifat material, pembebanan dan kondisi tanah; dan (4) memberikan rekomendasi desain slab meliputi bahan dan geometrik. Metode kajian dan evaluasi kerusakan slab dilakukan pengamatan kerusakan, pengambilan core-case beton dan pengujiannya di laboratorium, serta pemodelan struktur slab dengan berbagai parameter (data tanah, mutu beton dan geometri slab). Hasil pengamatan di lapangan dan hasil analisis maka dapat diketahui bahwa spalling beton slab terjadi awalnya pada bagian tepi (sisi lebar 850 mm) yang selanjutnya menyebabkan efektifitas gaya pretension menjadi tidak optimal dan akhirnya volume spalling beton menjadi semakin bertambah. Selain karena frekuensi benturan saat pemasangan dan deformasi slab saat mendukung beban kendaraan. Permasalahan spalling beton juga dikarenakan mutu beton yang tidak sesuai.
},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{64c,
title = {Effect of specimen gauge reduction on uniaxial tension properties of reinforcing steel},
author = {A. Triwiyono, A.L. Han, S. Tudjono, A. Aryanto, B.S. Gan},
url = {https://link.springer.com/article/10.1007/s42243-020-00458-1},
doi = {https://doi.org/10.1007/s42243-020-00458-1},
year = {2020},
date = {2020-07-27},
journal = {Journal of Iron and Steel Research International},
abstract = {The Standard Test Methods for Tension Testing of Metallic Materials (ASTM E8) mandates a specimen gauge reduction for obtaining the tensile properties of reinforcing steel bars. The standard outlines the specimen preparation requirements and methods to ensure that test results well represent the material properties. On the other hand, some codes differ regarding the approach to specimen preparation. They do not apply gauging, for both deformed and plain steel bars. Thus, the effect of specimen gauge reduction on the tensile properties of reinforcing steel bars was evaluated, and the interconnection of properties to the layer hardness was analysed. The experiment governed a range of deformed hot-rolled bar sizes, tested in tension using precision instruments. The Rockwell hardness test was implemented layerwise on the specimen’s cross section, and the hardness number (HRC) was measured as a function of the layer distance to the centre. A finite element model was constructed to study the stress concentrations induced by a constant indentation, simulating the HRCs, and to numerically construct the stress–strain relationship of ungauged steel bars based on the core properties and the section HRC relationship. Scanning electron microscopy readings were performed to visually and chemically justify the results. It was shown that the specimen gauge reduction significantly influenced the resulting stress–strain behaviour of the material, and the yield and ultimate strengths were reduced. It was also demonstrated that the hardness response is proportional to the distance to the specimen’s axes. The corresponding yield and ultimate strengths thus increased accordingly, from the inner to the outer layers of the bar. Testing a gauged specimen will therefore result in lower strength than that of an ungauged steel bar.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{71,
title = {Compressive Strength Analysis On Geopolymer Paving By Using Waste Substitution Of Carbide Waste And Fly Ash},
author = {Mochammad Qomaruddin, Han Ay Lie, Arif Hidayat, Sudarno, Anik Kustirini},
url = {https://iopscience.iop.org/article/10.1088/1742-6596/1424/1/012052/meta},
doi = {https://doi.org/10.1088/1742-6596/1424/1/012052},
year = {2020},
date = {2020-07-20},
journal = {Journal of Physics: Conference Series},
volume = {1424},
abstract = {The method to make paving sample in this research was done by mixing fly ash, carbide waste, sand, and alkali activator in the form of sodium silicate (Na2SiO3), 8M and 12M sodium hydroxide (NaOH) with ratio 1 : 2 as the binder, then it was pressed by using hydraulic press machine. The paving was made in the size of 20 cm x 10 cm x 6 cm with mix composition of 70% fine aggregate, 30% binder and activator from paving weight. The percentage of binder and activator was 65% and 35%, respectively. The curing was done by using wet burlap sack for about 28 days. After that, the compressive strength test was done. From the result of the compressive strength test of geopolymer paving sample can be concluded that the mixed test of carbide waste and fly ash (10 %: 90%) produced 34,6 MPa, and 39,8 MPa for its compressive strength.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{63b,
title = {The Behavior of Reinforced Concrete Members with Section Enlargement Using Self-Compacting Concrete},
author = {Nuroji Nuroji, Chung-Chan Hung, Blinka Hermawan Prasetya, Aylie Han},
url = {https://www.praiseworthyprize.org/jsm/index.php?journal=irece&page=article&op=view&path%5B%5D=24440
https://doi.org/10.15866/irece.v11i3.18574},
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}
}