| 1. |  | Agus Maryoto; Han Ay Lie; Hendrik Marius Jonkers: Flexural strength of concrete-galvalume composite beam under elevated temperatures. In: Computers and Concrete, 27 (1), pp. 13-20, 2020. (Type: Journal Article | Abstract | Links)@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}
}
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. |
| 2. |  | Banu A. Hidayat; Hsuan-Teh Hu; Fu-Pei Hsiao; Ay Lie Han; Panapa Pita; Yanuar Haryanto
: Seismic performance of non-ductile detailing RC frames: An experimental investigation. In: Earthquakes and Structures, 19 (6), pp. 485-498, 2020. (Type: Journal Article | Abstract | Links)@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}
}
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.
|
| 3. |  | Bagus Hario Setiadji; Hariadi Dewabrata; Han Ay Lie; Sie Alexander P. : Studi Penggunaan Semen Slag sebagai Substitusi Semen Portland pada Beton. In: Jurnal Teknik Sipil Siklus, 6 (2), pp. 117 - 128, 2020, ISSN: 2549- 3973. (Type: Journal Article | Abstract | Links)@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}
}
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. |
| 4. |  | Harijanto Setiawan; Ferianto Raharjo; Ay Lie Han: An Innovation Value Chain in Project Based Companies: A Study of Indonesian Contractors. In: Civil Engineering Dimension, 22 (2), pp. 101-108, 2020, ISSN: 1410-9530. (Type: Journal Article | Abstract | Links)@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}
}
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. |
| 5. |  | I Gusti Lanang Bagus Eratodi, Ali Awaludin, Ay Lie Han, Andreas Triwiyono: Kajian dan Evaluasi Struktur Slab Prestressed Precast Modular Concrete. In: Media Komunikasi Teknik Sipil, 11 (3), 2020. (Type: Journal Article | Abstract | Links)@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}
}
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.
|
