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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Research Report - Engineering Science Mekanika Jurnal Teknik Sipil Journal of the Civil Engineering Forum Dinamisia: Jurnal Pengabdian Kepada Masyarakat SIKLUS: Jurnal Teknik Sipil Jurnal Teknik Sipil
Johannes Adhijoso Tjondro
Jurusan Teknik Sipil, Fakultas Teknik Universitas Katolik Parahyangan, Bandung
Civil Engineering, Building, Construction & Architecture Engineering Environmental Science 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.
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.
Co-Authors Agustina, Theresia Aldrianita, Tabitha Andreas Onky Aswin Lim Bambang Suryoatmono Benny Kusumo Bobby Minola Ginting Budijanto Widjaja Buen Sian David Setiawan, David Dennis Indriani Djoni Simanta Evan Kurnia Rosiman Evan Kurnia Rosiman, Evan Kurnia Fadhil, Imam Ahmad Felix Hidayat Hartieni, Patricia Helmy Hermawan Tjahjanto Herry Suryadi Ignatius Tommy Pratama Martinus Pramanata Sapeai, Martinus Pramanata Nathanael Nathanael Riani Sidauruk Riani Sidauruk Sandra Natalia Simanta, Djoni Steven Varian Lokanatha Theresita Herni Setiawan Wijaya, Obaja Triputera William, Octavianus Yohanes Lim Dwi Adianto Yosafat Aji Pranata Yosafat Aji Pranata