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Nonlinear Finite Element Modeling of Red Meranti Compression at an Angle to the Grain Pranata, Yosafat A.; Suryoatmono, Bambang
Journal of Engineering and Technological Sciences Vol 45, No 3 (2013)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1380.458 KB) | DOI: 10.5614/j.eng.technol.sci.2013.45.3.2

Abstract

In an orthotropic material, the grain angle has a significant influence on its mechanical properties. The aim of this research was to perform a numerical simulation using a nonlinear finite element analysis (FEA) to obtain the compression strength of the Red Meranti (shorea spp.) timber species at an angle to the grain ranging from 12° to 80°. The material properties needed for the analysis were obtained from clear specimen tests. To investigate the validity of the numerical results, various cross grain specimens were tested under uniaxial compressive stress. It has been shown in this study that an FEA based on the distortion energy of an orthotropic material can be used to obtain the compressive strength at proportional limit for cross grain specimens. Compa-rison with the experimental results showed that for a cross grain angle between 12° and 80° the FEA predicted the strength to be 9.4% to 33.6% lower than the experimental results. Compared to using Hankinson’s formula to predict the compressive strength at a cross grain angle, using the FEA always gave a lower value, ranging from 13.2% to 30.5%. Based on these results, an FEA incorporating Hill’s yield criterion is a conservative method for predicting compressive strength at an angle to the grain.
Kekuatan Tekan Sejajar Serat dan Tegak Lurus Serat Kayu Ulin (Eusideroxylon Zwageri) Pranata, Yosafat Aji; Suryoatmono, Bambang
Jurnal Teknik Sipil Vol 21, No 1 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (524.362 KB)

Abstract

Abstrak. Kayu Ulin (Eusideroxylon Zwageri) termasuk salah satu kayu dengan kekuatan tinggi. Penelitian ini bertujuan untuk mendapatkan kekuatan tekan sejajar serat dan tegak lurus serat kayu Ulin dengan pengujian eksperimental. Hasil yang diperoleh adalah kekuatan tekan sejajar serat pada beban proporsional sebesar 50,53 MPa (deviasi standar 11,35 MPa dan koefisien variasi 22,47%), kekuatan tekan sejajar serat pada beban ultimit 55,64 MPa (deviasi standar 11,17 MPa dan koefisien variasi 20,07%), kekuatan tekan tegak lurus serat pada beban proporsional sebesar 20,26 MPa (deviasi standar 2,10 MPa dan koefisien variasi 10,31%), dan kekuatan tekan tegak lurus serat pada beban ultimit 29,74 MPa (deviasi standar 4,62 MPa dan koefisien variasi 15,52%). Modulus elastisitas tekan sejajar serat yang diperoleh sebesar 10155,05 MPa, dan modulus plastisitas tekan sejajar serat sebesar 1317,83 MPa. Modulus Elastisitas tekan sejajar serat yang diperoleh sebesar 1381,84 MPa, dan  modulus plastisitas tekan tegak lurus serat sebesar 195,77 MPa. Hasil penelitian ini diharapkan dapat memberikan sumbangan ilmiah untuk basis data sifat mekanika kayu Indonesia dan khususnya untuk perencanaan komponen struktur tekan dan lentur.Abstract. Ulin (Eusideroxylon Zwageri) is one of wood species with high strength. This study aims to obtain the compressive strength parallel and perpendicular to the grain carry by experimental tests. The result obtained are the compressive strength parallel to the grain at proportional load 50.53 MPa (standard deviation 11.35 and coefficient of variation 22,47%), the compressive strength parallel to the grain at ultimate load 55.64 MPa (standard deviation 11.17 and cov 20,07%), the compressive strength perpendicular to the grain at proportional load 20.36 MPa (standard deviation 2.10 MPa and cov 10,31%), and the compressive strength perpendicular to the grain at ultimate load 29.74 MPa (standard deviation 4.62 MPa and cov 15,52%). Modulus of elasticity compression parallel  to the grain obtained from this research is 10155.05 MPa, and modulus of plasticity compression parallel to the grain 1317,83 MPa. Modulus of elasticity compression perpendicular to the grain is 1381,84 MPa, and modulus of plasticity compression perpendicular to the grain is 195,77 MPa. The result is expected to contribute to general scientific databases mechanical properties of wood in Indonesia and particularly in the design of the compressive and flexural structural components.
Rasio Modulus Penampang Elastik Balok Kayu Laminasi-Baut Pranata, Yosafat Aji; Suryoatmono, Bambang; Tjondro, Johannes Adhijoso
Jurnal Teknik Sipil Vol 19, No 3 (2012)
Publisher : Institut Teknologi Bandung

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Abstract

Abstrak. Balok laminasi dapat menjadi alternatif pengganti kayu utuh, karena memberikan keuntungan yaitu dapat difabrikasi dengan bentang sesuai kebutuhan dan membuat penampang kayu yang lebih besar. Tujuan penelitian ini adalah menemukan persamaan empiris rasio modulus penampang elastik balok kayu laminasi-baut. Rasio modulus penampang elastik yaitu rasio antara modulus penampang elastik balok laminasi terhadap balok utuh. Ruang lingkup penelitian yaitu sistem laminasi secara horisontal, kayu Indonesia dengan berat jenis berkisar 0,4-0,8 yaitu meranti merah (shorea spp), keruing (dipterocarpus spp), dan akasia mangium, penampang balok prismatis, penelitian dilakukan secara eksperimental di laboratorium dan numerikal metode elemen hingga nonlinier. Parameter yang dibahas adalah jenis kayu, ukuran baut, jumlah baris baut, dan jarak baut. Balok mempunyai bentang 3 meter dan disusun oleh 4 lamina. Model tegangan-regangan kayu untuk simulasi numerikal berdasarkan kriteria plastisitas Hill, model tegangan-regangan baut menggunakan model elastoplastik. Kesimpulan yang diperoleh yaitu tren kurva hubungan beban-lendutan balok kayu laminasi-baut adalah berbentuk bilinier, persamaan empiris rasio modulus penampang elastik merupakan fungsi dari jenis kayu, diameter baut, dan rasio jumlah baris terhadap jarak baut. Rasio modulus penampang elastik dapat digunakan untuk memprediksi kuat lentur balok laminasi pada beban batas proporsional. Abstract. Laminated beam can be an alternative for solid timber, because it provides the advantage that it can be fabricated with a needed-span and a bigger cross section. The purpose of this research is to obtain an empirical equation of the bolt-laminated timber beam elastic section modulus ratio. Elastic section modulus ratio is elastic section modulus ratio between laminated and solid beams. Scope of this research are horizontally laminated system, Indonesian timber with specific grafity ranged 0.4-0.8 which are red meranti (shorea spp), keruing (dipterocarpus spp), and acacia mangium, prismatic beam section, experimental test in laboratorium and numerical simulation using nonlinear finite element method. The parameters discussed are timber type, bolt diameter, number of row, and spacing. Beam has a 3-meter span and arranged by 4 laminae. Timber stress-strain model for numerical simulation based on Hill plasticity, bolt stress-strain model is elasto-plastic. Results obtained are beam load-displacement curve trend is bilinear, the elastic section modulus ratio equation are the fuction of timber type, bolt diameter, and number of row against bolt spacing ratio. The elastic section modulus ratio can be used to predict the bending strength at the proportional limit.
ANALISIS KEGAGALAN STRUKTUR BANGUNAN RUMAH TINGGAL DENGAN METODE ELEMEN HINGGA LINIER Leny Elvira, Yosafat Aji Pranata
Jurnal Teknik Sipil Vol 12, No 3 (2013)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (439.372 KB) | DOI: 10.24002/jts.v12i3.624

Abstract

Komponen utama penyusun struktur bangunan rumah tinggal adalah kolom dan balok. Dinding bata sebenarnya merupakan komponen struktur utama pula, namun sering diasumsikan sebagai komponen non-struktural dalam peraturan SNI 03-2847-2002, sehingga pada umumnya pengaruh kekuatan dan kekakuan dinding bata jarang diperhitungkan dalam perencanaan bangunan. Tujuan dari penelitian ini adalah membuat model rumah tinggal dua lantai secara 3D (bangunan eksisting) dengan metode elemen hingga. Analisis dibuat dengan pemodelan dua dimensi (elemen shell). Pemodelan rumah tinggal meliputi balok, kolom, pelat lantai, dinding bata, kusen dan tulangan balok. Beban yang direncanakan adalah beban gravitasi dan beban lateral (gempa), sehingga dapat diketahui pengaruhnya terhadap struktur rumah tinggal. Kemudian dipelajari dan dianalisis deformasi pada balok dan tegangan S11 yang terjadi pada balok, pelat lantai, dinding bata, kolom dan kusen. Hasil yang diperoleh dari penelitian adalah memperlihatkan bahwa lendutan yang terjadi pada semua balok masih memenuhi batasan lendutan ijin. Terjadi kegagalan pada beberapa daerah balok, dinding, dan lantai, dengan indikasi dari informasi besarnya tegangan (S11) yang terjadi telah melebihi batasan kuat tekan beton. Sedangkan hasil simulasi memperlihatkan bahwa tegangan (S22) yang terjadi pada kolom masih lebih kecil daripada nilai kuat tekan beton, sehingga kolom masih dalam kondisi kuat. Hasil simulasi memperlihatkan bahwa tegangan yang terjadi pada kusen lebih kecil daripada nilai kuat tarik dan kuat tekan kayu jenis meranti merah, sehingga kusen masih dalam kondisi utuh. Secara umum informasi kegagalan struktur pada bagian dinding bata menggambarkan bahayanya kerusakan rumah tinggal akibat gempa.
KEKUATAN LENTUR, MOE, DAN MOR KAYU ULIN (EUSIDEROXYLON ZWAGERI) Johnny Gunawan Palapessy, Yosafat Aji Pranata
Jurnal Teknik Sipil Vol 13, No 1 (2014)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3307.913 KB) | DOI: 10.24002/jts.v13i1.641

Abstract

Dalam perencanaan balok kayu (komponen struktur lentur), diperlukan parameter kekuatan lentur kayu (Fb) dan modulus elastisitas (MoE). Kekuatan lentur dapat diperoleh dari hasil pengujian eksperimental di laboratorium dengan acuan standar antara lain ASTM D143. Penelitian ini bertujuan melakukan pengujian eksperimental uji lentur kayu Ulin (Eusideroxylon Zwageri) dengan alat Universal Testing Machine (UTM). Hasil yang diperoleh adalah kekuatan lentur (Fb) pada beban batas proporsional, kekuatan lentur pada beban ultimit (MoR), dan modulus elastisitas (MoE) lentur. Jumlah benda uji adalah tiga benda uji ukuran penampang 50 mm x50 mm x 760 mm sesuai metode uji primer ASTM D143. Hasil yang diperoleh adalah Fb sebesar 52,45 MPa (deviasi standar 226,24 MPa dan koefisien variasi 25,40%), MoE sebesar 5573,79 MPa, MoR sebesar 85,92 MPa (deviasi standar 112,55 MPa dan koefisien variasi 7,71%).
Pengembangan Sambungan Hubungan Join Balok-Kolom Kayu dengan Ring-Modifikasi dan Perkuatan-Paku Pranata, Yosafat Aji; Kristianto, Anang; Pattipawaej, Olga Catherina
Jurnal Teknik Sipil Vol 22, No 1 (2015)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3171.932 KB) | DOI: 10.5614/jts.2015.22.1.5

Abstract

Abstrak. Sambungan antar komponen struktur, khususnya hubungan join balok-kolom memberikan kontribusi yang dominan terhadap perilaku struktur bangunan gedung. Penelitian ini bertujuan untuk mempelajari perilaku kekuatan dan kekakuan sambungan kayu dengan alat sambung baut, yaitu hubungan join balok-kolom. Dalam penelitian ini dikembangkan model perkuatan sambungan dengan adanya ring-modifikasi dan perkuatan-paku (selanjutnya disebut sambungan PRP) untuk meningkatkan tingkat daktilitas sambungan. Ruang lingkup penelitian antara lain jenis kayu yang digunakan yaitu Meranti (Shorea spp.), Rengas (Gluta spp.), dan Keruing (Dipterocarpus spp.) dengan rentang berat jenis berkisar antara 0,47-0,72. Pengujian eksperimental dilakukan di laboratorium dengan tipe pembebanan monotonik. Model benda uji yang digunakan mengacu pada metode uji baut pada sambungan kayu ASTM D5652-95. Penggunaan ring-modifikasi dan perkuatan paku memberikan kontribusi positif terhadaphasil pengujian sambungan khususnya perilaku kinerja kekuatan dan kekakuan sambungan kayu, yaitu beban batas proporsional yang dapat dicapai sambungan PRP meningkat berkisar 3,09-19,89% lebih tinggi dibandingkan dengan sambungan standar (tanpa perkuatan), beban batas ultimit yang dapat dicapai sambungan PRP 3,47-28,94% lebih tinggi dibandingkan dengan sambungan standar. Secara umum tingkat daktilitas yang dapat dicapai sambungan PRP adalah 3,69-11,03% lebih tinggi dibandingkan dengan sambungan standar. Abstract. The connection between the structural members, especially the beam-column joints provide a dominant contribution to the behavior of the building structure. The aim of this research is to study the behavior of strength and stiffness of timber connection with a bolt connection, which are the beam-column joints. In this study is developed a reinforcement connection model with the ring-modification and nail-strengthening (hereinafter referred to as the PRP connection) to improve the connection ductility. The scope of the study is the types of timber used such as Meranti (Shorea spp.), Rengas (Gluta spp.), and Keruing (Dipterocarpus spp.) with Specific Gravity ranged from 0.47 to 0.72. Experimental tests are performed in the laboratory using the monotonic loading type. The use of specimens are based on a standard test method for bolts connections in wood ASTM D5652-95. The use of ringmodification and nail-strengthening give a positive contribution to the test results, especially the connection strength and stiffness performance behavior of timber connections, i.e., the proportional limit load can be achieved the PRP connection ranged from 3.09 to 19.89% that increases higher than the standard connection (without reinforcement), ultimate limit loads that can be achieved the PRP connection from 3.47 to 28.94% which is higher compared to the standard connection. In general, the level of ductility can be achieved the PRP connection between 3.69 and 11.03% which is higher compared to the standard connection.
Studi Eksperimental Penggunaan Pen-Binder dan FRP Sebagai Perkuatan Tulangan Tidak Standar Pada Kolom Lingkaran Kristianto, Anang; Pranata, Yosafat Aji; Imran, Iswandi
Jurnal Teknik Sipil Vol 24, No 1 (2017)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2802.997 KB) | DOI: 10.5614/jts.2017.24.1.7

Abstract

AbstrakPenelitian ini dilakukan untuk mengevaluasi peningkatan kekuatan yang terjadi pada spesimen kolom lingkaran beton bertulang dengan tulangan pengekang tidak standar yang diberi perkuatan pen-binder dan perkuatan FRP. Benda uji berupa kolom lingkaran dengan diameter 190 mm dan tinggi 480 mm dengan mutu beton 15 MPa. Benda uji terdiri dari 4 jenis yaitu kolom dengan tulangan sengkang spiral, kolom dengan tulangan tidak standar/lingkaran, kolom dengan tulangan tidak standar yang diberi perkuatan pen-binder dan kolom dengan tulangan tidak standar dengan perkuatan FRP. Untuk setiap jenis kolom dibuat 3 buah benda uji yang sama. Pengujian dilakukan dengan uji tekan konsentris hingga kolom mengalami kegagalan. Hasil penelitian menunjukan bahwa penggunaan pen-binder dan FRP pada tulangan pengekang tidak standar memberikan peningkatan kapasitas aksial berturut-turut sebesar 18% dan 58% dari kolom dengan tulangan spiral. Pen-binder dapat digunakan sebagai solusi perkuatan sederhana untuk tulangan pengekang tidak standar dan lebih ekonomis daripada FRP.AbstractThis study was conducted to evaluate the increasing strength of circular reinforced concrete column specimens with non-compliance confinement reinforcements strengthened by pen-binder and FRP. The test specimens were circular column 190 mm diameter and 480 mm height with 15 MPa concrete strength. The test specimens consist of 4 types of columns where there is a column with spiral reinforcement, columns with non compliance reinforcements, a column with non-compliance reinforcement strengthened by pen-binder and columns with non-compliance reinforcements strengthened with FRP reinforcement. Three specimens were made for each type of column. The axial concentric test was done until the column specimen failure. Test results showed that the use of pen-binder and the FRP with non-compliant confining reinforcement improved axial capacity by 18% and 58% respectively as compared to the columns with spiral reinforcements. Pen-binder can be used as a simple solution for non compliant confining reinforcement strengthening and more economical than FRP. 
Evaluasi Level Kinerja Bangunan Gedung Kayu Bertingkat Rendah Akibat Beban Gelombang Pranata, Yosafat Aji; Suroso, Fadlillah Ariani; Herbudiman, Bernardinus
BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 9 No 1 (2021): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v9i1.2197

Abstract

Several coastal areas in Indonesia are at risk of moderate to high tsunami disasters, this is related to the condition that Indonesia is located in an earthquake high risk area. At this time there are many buildings located on the coast with a low-rise stilt house system with the main structural system, namely beams and columns using timber materials. The building structure design includes the performance evaluation process, namely strength, stiffness and structural stability. The purpose of this research is to study the evaluation behavior of performance levels, especially the strength and stiffness of low-rise timber buildings, namely the level of structural performance due to gravity and lateral loads, namely sea waves. The research scope is a three-story building with a beam and column frame structure system. Columns are circular and beams have a square cross section. The loads taken into account are gravity and lateral. The strengths discussed are the bending capacity of the beam and the compressive capacity of the column. In order to obtain building behavior that is closer to real conditions, especially in beam-column joints, secondary data is used, namely empirical data on the envelope load-deformation curve of the beam-column joint test results in the laboratory (modeled as link property). Evaluation of structural performance begins with structural analysis using SAP2000 software, to obtain internal forces and building drift. The results show that the use of link properties in beam-column joint joints in the timber building structures shows greater deformation results compared to rigid joint models, this indicates that modeling the structure with beam-column joint joints modeled as link property has an impact on building stiffness. Lower and represents the condition of a timber building with beam-column joint characteristics closer to the actual condition. The existence of a hole size in the column (to insert the beam) which is larger than the cross-sectional size of the beam results in the rotation of the joint not being zero and a slip occurs when the joint works to transmit internal forces.
Beam-Column Timber Joint Connection Behavior Due to Nail and Modified-Washer Reinforcement Tests Yosafat Aji Pranata; Anang Kristianto; Olga Pattipawaej
Wood Research Journal Vol 10, No 1 (2019): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2019.10.1.6-10

Abstract

Timber connection capacity, in case of beam-column joint connection provides significant impact on the wooden building structures. Strength and stiffness of timber connections using reinforcement technique of wooden building structures have not been studied intensively. This paper studies the use of nails and modified-washer to improve wood connection’s performance. The experimental tests were conducted in the laboratory by comparing the partial connection between test specimen timber without reinforcement (standard type) and the reinforcement (PRP type). The testing was conducted based on partial connection beam-column joint test using Universal Testing Machine’s with a modified holder. Wood studied includes Meranti (Shorea spp.) and Mersawa (Anisoptera spp.). PRP type connection was using nails and modified-washer strengthening, and standard type connection was using a classic washer. Parameters studied were strength and stiffness of the connection, reviewed both: proportional limit load and ultimate limit load conditions. Result obtained from this research indicates that the use of nails and modified-washer make a positive contribution to improving the performance of the beam- column timber joint connections, in terms of strength capacity (both of proportional limit and ultimate limit loads) and stiffness capacity (displacement ductility ratio). Meranti beam-column timber joint is more brittle than Mersawa beam column timber joint, it has an impact on the results. PRP-type of Mersawa timber connection produces a higher ductility than the standard type, while the PRP-type of Meranti timber connection produces a similar ductility to the standard type.
Strength and Stiffness Behavior of Earthquake Resistant Pedestrian LVL Timber Bridge Bernardinus Herbudiman; Delima Delima; Yosafat Aji Pranata
Wood Research Journal Vol 11, No 2 (2020): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2020.11.2.53-57

Abstract

A bridge is a structure which is used to connect two areas separate by obstacles. The environmental damage caused a number of reductions in the production of timber, and by that, the LVL timber which is a high quality processed or engineered timber is chosen. This research determined the design of the timber bridge structure for pedestrian with simple beam type and earthquake resistant. The load in this bridge is referring to the SNI 1725:2016 and SNI 2833:2008, the design of the girder and the connection is referring to SNI 7973:2013, and the deflection is referring to the LFRD for Highway Bridge Superstructures. The timber bridge is designed to have a span of 10 metres long and 3 metres wide. The modeling and designing of the wooden bridge are using an application called SAP2000 based on finite element analysis. Result obtained from this research indicated that the longitudinal dimension of the girder is 360 mm x 630 mm and the cross sectional dimension is 180 mm x 270 mm. The number of bolts and lock screws needed on the connection among the longitudinal girders are 40 pieces, between the longitudinal girders and the cross sectional girders is three pieces, and between the railing and the slab are two pieces. Based on the stiffness review, the results showed that the bridge deflection that occurred was lower than the permit deflection
Co-Authors AAN DARMAWAN Alfatama, Jasen Amos Setiadi, Amos Anang Kristianto Andrias Suhendra Nugraha Ary Dharmawan Bambang Suryoatmono Bas Boys, Maher Salal Hesy Bernardinus Herbudiman Bernardinus Herbudiman Bernardinus Herbudiman Bernardinus Herbudiman, Bernardinus Boys, Salal Hesy Bas Calvien Haryanto Chandra, Jonathan Daud R. Wiyono Daud Rahmat Wiyono Dedi Hadian Delima Delima Deni Setiawan Deni Setiawan DENI SETIAWAN Deni Setiawan Dharmawan, Ary Elty Sarvia Fadlillah Ariani Suroso Faraz Haiatul Maknun Frisda, Tani Gaol, Ricky Fransiskus Lumban Ginardy Husada Hagiyanto, Sofhie Angela Hanny Juliani Dani Hartono, Sutantra Hendry Wong Hutasoit, Aldi Febri Iswandi Imran Jimmy Agustian Loekito Jimmy Agustian Loekito Johannes Adhijoso Tjondro Johnny Rakhman Kevin Tjahyadi Keysie Chelsie Shidney Rapar Laia, Viencent Cheristian Lehman, Andrew Sebastian Loekito, Jimmy Agustian Maknun1, Faraz Haiatul Maria Christine Sutandi Markus Tanubrata Marvin Chandra Wijaya Michael Wijaya Muhammad Rusli Nathan Madutujuh Noek Sulandari Noek Sulandari Noek Sulandari Noek Sulandari Novi Novi Novi Soesilo Novie Theresia Br. Pasaribu Olga Catherina Pattipawaej Pin Panji Yapinus, Pin Panji Prasodjo, Kaira Jesusa Pricillia Sofyan Tanuwijaya Riko Arlando Saragih Robby Yussac Tallar Roi Milyardi Roky Surono Saputra, Yonathan Adi Saudila, Aulia Jessica Semuil Tjiharjadi Shidney Rapar, Keysie Chelsie Simanta, Djoni Soesilo, Novi Sugianto, Joesack Renaldi Suhanda, Felix Suhendar, Prabu Mandvi Hafiz Anjar Suroso, Fadlillah Ariani Syafarina Nurmah Rialita Verena Bernadetta C. N Viencent Cheristian Laia Wiyono, Daud R Wiyono, Daud Rahmat Yonathan Aditya Santoso Yunizar Yunizar