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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Research Report - Engineering Science REKA RACANA Mekanika Jurnal Teknik Sipil Journal of the Civil Engineering Forum Dinamisia: Jurnal Pengabdian Kepada Masyarakat SIKLUS: Jurnal Teknik Sipil CRANE: Civil Engineering Research Journal JURNAL POLI-TEKNOLOGI Jurnal Teknik Sipil
Johannes Adhijoso Tjondro
Universitas Katolik Parahyangan
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Rasio Modulus Penampang Elastik Balok Kayu Laminasi-Baut Yosafat Aji Pranata; Bambang Suryoatmono; Johannes Adhijoso Tjondro
Jurnal Teknik Sipil Vol 19 No 3 (2012)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2012.19.3.4

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.
Study on Strength and Stiffness of Meranti Wood Truss with Plywood Gusset Plate Connection and Lag Screw Fastener Naomi Pratiwi; Johannes Adhijoso Tjondro
Journal of the Civil Engineering Forum Vol. 4 No. 1 (January 2018)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (902.699 KB) | DOI: 10.22146/jcef.30230

Abstract

Wooden truss could be one of the options to be used as structural element in both in building and bridge. Wooden truss overcomes the limitation of timber with great dimension with necessary strength. In this study, the wooden truss was designed with Meranti wood type with elasticity modulus of 10,520 MPa and specific gravity of 0.8. The timber used has cross-section size of 45 mm × 45 mm, with truss frame span of 2,445mm and height of 400 mm. The connection between the timbers was using 18 mm thick plywood with 6 mm lag screw fastener. The destructive testing that was conducted on 3 test samples showed a result that the strength of the truss was at an ultimate load of 31,042 N with a ductility ratio of 5.61. Numerical study of the truss’ stiffness with this connection model resulted in stiffness degree value of 0.94. 
Studi Eksperimental Karakteristik Beton dengan Agregat Kasar Daur Ulang dengan fc’= 25 MPa Buen Sian; Johannes Adhijoso Tjondro; Riani Sidauruk
Jurnal Teknik Sipil Vol 9 No 2 (2013): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v9i2.1375

Abstract

Pada studi eksperimental ini, digunakan beton daur ulang dengan agregat kasarnya berasal darilimbah/brangkal benda uji beton di laboratorium. Benda uji silinder digunakan untuk mengetahuisifat mekanik seperti kuat tekan, kuat geser, dan kuat tarik belah. Tiga variasi persentase yangberbeda dari agregat kasar daur ulang digunakan dalam perencanaan campuran dengan fc’ = 25MPa, yaitu 0%, 50%, dan 100% agregat kasar daur ulang. Hasil pengujian menunjukan nilai kuattekan karakteristik fc’ = 28.7 MPa dan fc’ = 28.4 MPa untuk masing-masing campuran 50% dan100% agregat kasar daur ulang. Nilai kuat tarik belah sebesar fct = 2.38 MPa, fct = 2.78 MPa, dan fct= 2.81 MPa untuk 0%, 50%, dan 100% agregat kasar daur ulang. Sedangkan kuat geser fv = 5,55MPa, fv = 4.28 MPa, dan fv = 3.86 MPa untuk 0%, 50%, dan 100% agregat kasar daur ulang.
Uji Eksperimental Sambungan Pelat Baja Perantara dengan Sekrup Kunci pada Hubungan Balok-Kolom Kayu Meranti Merah Agustina, Theresia; Tjondro, Johannes Adhijoso; Setiawan, David
Siklus : Jurnal Teknik Sipil Vol. 10 No. 2 (2024): Siklus : Jurnal Teknik Sipil
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/siklus.v10i2.19036

Abstract

Research was conducted by testing the connection of solid red meranti wood beam and column using intermediate steel plate with lag screw as fasteners. There were 3 connection samples tested under monotonic load. Material properties of red meranti wood, testing of steel tensile strength, and testing of lag screw bending yield momen has been done to design connection. The behaviour studied in this research is moment capacity, rotation of connection, and ductility of connection. The test results show that initial stiffness of connections B-1, B-2, and B-3 resulting in ranges 10,17 N/mm – 19,05 N/mm. The connections experience plastic hinge with the plastic hinge load is 1617,37 N. The plastic hinges occur in the lag screws tightening area characterized by yielding in that area. The connection ductility resulting in ranges 4,0097 – 4,7642.
Eksperimental Perbandingan Kekuatan Tekan Karakteristik Beton Self Compacting Menggunakan Agregat Kasar Alami Dan Agregat Kasar Daur Ulang Martinus Pramanata Sapeai; Johannes Adhijoso Tjondro
Jurnal Poli-Teknologi Vol. 19 No. 1 (2020)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v19i1.2698

Abstract

Utilization of recycled concrete waste as an alternative to natural coarse aggregates in this experiment is in accordance with the concept of sustainable construction. Concrete is the main material of structural elements most commonly used in general construction and has properties that are difficult to recycle by themselves naturally. Nowdays concrete innovation with the concept of self compacting (SCC) is widely used especially in high rise building and buildings with special specification. SCC has high flowability properties so that it can flow and compact themselves, but in SCC with normal quality still need compactor. The concept of making test specimens is in accordance with real conditions in the field, where aggregates do not go through a cleaning process. There are four different mix design with the required specified compressive strength of 20 MPa. Mix design 1A (natural coarse) and 1B (recycled coarse aggregates) has a maximum aggregate size 12.50 mm, and mix design 2A (natural coarse) and 2B (recycled coarse aggregates) has a maximum aggregate size 19.00 mm. This experimental results in specified compressive strength concrete for mix design 1A, 1B, 2A, and 2B as follows: 30.93 MPa, 26.21 MPa, 30.82 MPa and 27.60 MPa. Therefore, recycled concrete aggregates can be alternative to natural coarse aggregates and can also be made into concrete with the SCC concept.
Landslide Treatment in the Al-Husainiyyah Junior High School Area using Cantilever-Geofoam Wall: Penanganan Longsor di Lingkungan SMP Al-Husainiyyah dengan Menggunakan Dinding Kantilever-Geofoam Lim, Aswin; Pratama, Ignatius Tommy; Widjaja, Budijanto; Tjahjanto, Helmy Hermawan; Tjondro, Johannes Adhijoso; Wijaya, Obaja Triputera; Ginting, Bobby Minola; Setiawan, Theresita Herni; Adianto, Yohanes Lim Dwi; Hidayat, Felix; Hartieni, Patricia; William, Octavianus; Aldrianita, Tabitha; Fadhil, Imam Ahmad
Dinamisia : Jurnal Pengabdian Kepada Masyarakat Vol. 8 No. 4 (2024): Dinamisia: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/dinamisia.v8i4.19519

Abstract

A landslide triggered by heavy rainfall occurred in the Al-Husainiyyah Junior High School area on April 26th, 2023. The landslide damaged the nearby access roads, the existing retaining wall, and a futsal court threatening the safety of the teachers and students in conducting the learning activities that especially require open areas. Thus, this community service aims to provide a cantilever wall design with geofoam as an innovative lightweight backfill material to reinforce the slope and repair the damaged structures. Field surveying and numerical analysis were then conducted to understand the current slope and soil conditions and to analyze the stability of the slope and retaining wall. The results show that a cantilever wall with a total height of 1.8 m supported by a strauss pile row with a diameter of 0.4 m, 4 m in length, and 2.5 m in spacing could increase the stability of the slope.
KAJIAN EKSPERIMENTAL STRESSED SKIN PANEL MENGGUNAKAN CROSS-LAMINATED TIMBER DAN GLULAM Naomi Pratiwi; Johannes Adhijoso Tjondro; Alexander Mario Kwa
CRANE: Civil Engineering Research Journal Vol 7 No 2 (2026): CRANE - OKTOBER
Publisher : Program Studi Teknik Sipil, Fakultas Teknik dan Ilmu Komputer, Universitas Komputer Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/crane.v7i2.19820

Abstract

Engineered wood products such as glulam and Cross-Laminated Timber (CLT) offer sustainable alternatives to large-dimension structural timber. This study investigates the flexural behavior of Stress Skin Panels (SSP) composed of CLT skins and glulam stringers, comparing single-skin (SSP-T) and double-skin (SSP-G) configurations using Sengon wood. Static bending tests were conducted on two specimens per configuration to evaluate strength, stiffness, ductility, and failure modes. Results show that the double-skin configuration yields limited increases in ultimate capacity by 7.8% and stiffness by 8.2%, indicating partial composite action. However, deformation capacity increases significantly by 71.2%, with a 38% improvement in ductility ratio and a 61.5% reduction in bending stress, reflecting more uniform stress distribution. Single-skin panels exhibit brittle stringer failure, whereas double-skin panels demonstrate progressive failure governed by interfacial slip and delamination. These findings highlight the effectiveness of double-skin SSP in enhancing ductility and post-elastic performance.
Hubungan Balok-Kolom Glulam Jabon dengan Pelat Baja Siku dan Pengencang Sekrup Kunci Erma Desimaliana; Johannes Adhijoso Tjondro
RekaRacana: Jurnal Teknik Sipil Vol 12, No 1: Maret 2026
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v12i1.78

Abstract

ABSTRAKPenggunaan glulam Jabon pada struktur kayu rekayasa memerlukan hubungan balok-kolom yang kuat, stabil, dan daktil. Penelitian ini mengevaluasi perilaku hubungan balok-kolom glulam Jabon dengan pelat baja siku dan pengencang sekrup kunci. Pengujian monotonik dilakukan pada tiga benda uji identik dengan pembebanan lateral di ujung balok. Data beban dan perpindahan diolah menjadi kurva beban-perpindahan serta momen-rotasi untuk menentukan kapasitas, kekakuan, faktor bilinier, dan daktilitas. Hasil menunjukkan beban puncak rata-rata sebesar 2,64 kN pada perpindahan 23,44 mm. Momen leleh dan momen ultimit rata-rata masing-masing 0,75 kN-m dan 1,59 kN-m. Kekakuan rotasi leleh rata-rata 59,55 kN-m/rad, kekakuan ultimit 40,77 kN-m/rad, faktor bilinier 0,688, dan daktilitas rotasi 3,09. Kurva menunjukkan respons nonlinier dengan penurunan kekakuan akibat slip, deformasi tumpu lokal, dan rotasi sambungan. Perilaku tersebut menunjukkan bahwa transfer gaya berlangsung bertahap tanpa kegagalan mendadak pada zona sambungan. Sambungan berperilaku semi-rigid, daktil, dan tidak getas sehingga berpotensi dikembangkan sebagai alternatif sambungan glulam Jabon untuk struktur kayu rekayasa.Kata kunci: glulam Jabon, hubungan balok-kolom, pelat baja siku, sekrup kunci ABSTRACTThe use of Jabon glulam in engineered wood structures requires strong, stable, and ductile beam-column connections. This study evaluates the behavior of Jabon glulam beam-column connections with angle steel plates and keyed screw fasteners. Monotonic testing was conducted on three identical test specimens with lateral loading applied at the beam end. Load and displacement data were processed into load-displacement and moment-rotation curves to determine capacity, stiffness, bilinearity factor, and ductility. The results showed an average peak load of 2.64 kN at a displacement of 23.44 mm. The average yield moment and ultimate moment were 0.75 kN-m and 1.59 kN-m, respectively. The average yield rotational stiffness was 59.55 kN-m/rad, the ultimate stiffness was 40.77 kN-m/rad, the bilinearity factor was 0.688, and the rotational ductility was 3.09. The curves show a nonlinear response with a decrease in stiffness due to slip, local bearing deformation, and joint rotation. This behavior indicates that force transfer occurs gradually without sudden failure in the joint zone. The joint behaves as semi-rigid, ductile, and non-brittle, making it a potential alternative to Jabon glulam joints for engineered wood structures.Keywords: Jabon glulam, beam-column connection, angle steel plate, lag screw
Hubungan Balok-Kolom Kayu Glulam dengan Pelat Baja dan Pengencang Baut Nessa Valiantine Diredja; Johannes Adhijoso Tjondro
RekaRacana: Jurnal Teknik Sipil Vol 12, No 1: Maret 2026
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v12i1.65

Abstract

ABSTRAKPenelitian ini mengevaluasi perilaku hubungan balok–kolom kayu glued laminated timber (glulam) dengan pelat baja dan baut melalui pengujian monotonik. Tiga spesimen (SB1, SB2, SB3) diuji untuk memperoleh respons beban–perpindahan dan momen–rotasi, serta menentukan kapasitas, kekakuan rotasi awal, faktor bilinier, dan daktilitas sambungan. Kapasitas puncak berada pada rentang 3,826–3,906 kN dengan rata-rata 3,857 kN. Momen ultimit berada pada rentang 2,296–2,344 kNm dengan rata-rata 2,315 kNm, kekakuan rotasi awal ( ) rata-rata 35,761 kNm/rad, faktor bilinier pada rentang 0,72–0,77 dengan rata-rata 0,74, dan daktilitas rotasi ( ) pada rentang 1,81–2,44 dengan rata-rata 2,19. Kurva momen–rotasi menunjukkan respons yang relatif stabil dengan penurunan kapasitas bertahap setelah puncak. Secara keseluruhan, hubungan balok–kolom glulam dengan pelat baja dan baut menunjukkan kapasitas yang konsisten serta deformabilitas pasca-leleh yang memadai pada pembebanan monotonik.Kata kunci: Glulam, hubungan balok-kolom, baut, pelat baja, momen-rotasi, daktilitas ABSTRACTThis study evaluates the behavior of glued-laminated timber (Glulam) beam–column connections with steel plates and bolts under monotonic loading. Three specimens (SB1, SB2, SB3) were tested to obtain load–displacement and moment–rotation responses, and to determine connection capacity, initial rotational stiffness, bilinear factor, and ductility. Peak load ranged from 3,826 to 3,906 kN, with an average of 3,857 kN. Ultimate moment ranged from 2,296 to 2,344 kNm with an average of 2,315 kNm, initial rotational stiffness ( ) averaged 35,761 kNm/rad, the bilinear factor ranged from 0,72 to 0,77 with an average of 0,74, and rotational ductility ( ) ranged from 1,81 to 2,44 with an average of 2,19. Moment–rotation curves showed a relatively stable response with gradual post-peak capacity degradation. Overall, the Glulam beam–column connection with steel plates and bolts demonstrated consistent capacity and adequate post-yield deformability under monotonic loading.Keywords: LVLGlulam, beam–column connection, bolts, steel plate, monotonic test, moment–rotation
Co-Authors Agustina, Theresia Aldrianita, Tabitha Alexander Mario Kwa Andreas Onky Aswin Lim Bambang Suryoatmono Benny Kusumo Bobby Minola Ginting Budijanto Widjaja Buen Sian David Setiawan, David Dennis Indriani Djoni Simanta Erma Desimaliana Evan Kurnia Rosiman Evan Kurnia Rosiman, Evan Kurnia Fadhil, Imam Ahmad Felix Hidayat Hartieni, Patricia Helmy Hermawan Tjahjanto Herry Suryadi Djayaprabha Ignatius Tommy Pratama Martinus Pramanata Sapeai Martinus Pramanata Sapeai, Martinus Pramanata Naomi Pratiwi Nathanael Nathanael Nessa Valiantine Diredja Obaja Triputera Wijaya Riani Sidauruk Riani Sidauruk Sandra Natalia Simanta, Djoni Steven Varian Lokanatha Theresita Herni Setiawan William, Octavianus Yohanes Lim Dwi Adianto Yosafat Aji Pranata