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All Journal Jurnal Ilmiah Teknik Sipil MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Sipil Jurnal Teknik Sipil Journal of Engineering and Technological Sciences Mekanika Jurnal Teknik Sipil Journal of the Civil Engineering Forum Jurnal Aplikasi Teknik Sipil Jurnal Teknik Sipil
Bambang Suryoatmono
Universitas Katolik Parahyangan
Civil Engineering, Building, Construction & Architecture Engineering Environmental Science Transportation

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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (816.104 KB)

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.
PENELITIAN EKSPERIMENTAL KUAT LELEH LENTUR (Fyb) BAUT Johannes Adhijoso Tjondro, Yosafat Aji Pranata Bambang Suryoatmono
Jurnal Teknik Sipil Vol 12, No 2 (2013)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (256.509 KB) | DOI: 10.24002/jts.v12i2.607

Abstract

Baut adalah suatu batang silinder atau tabung dengan alur heliks pada permukaannya, dengan penggunaan utamanya adalah sebagai pengikat (fastener) untuk menahan dua atau lebih obyek bersama. Salah satu manfaat penting baut berkaitan dengan perencanaan struktur bangunan gedung dan jembatan, khususnya struktur dengan bahan material kayu, yaitu sebagai alat sambung mekanik. Salah satu parameter sifat mekanis yang digunakan dalam perencanaan sambungan yaitu kuat leleh lentur (Fyb). Dalam peraturan kayu Amerika Serikat NDS 2012 telah tersedia persamaan untuk memprediksi besarnya Fyb, sedangkan dalam draft peraturan kayu Indonesia terbaru (RSNI 201x) belum tersedia panduan untuk menentukan besarnya nilai Fyb. Dalam makalah ilmiah ini disampaikan hasil penelitian eksperimental kuat leleh lentur baut, khususnya untuk baut yang ada di pasaran Indonesia. Diameter baut yang dibahas terbatas yaitu 8 mm, 10 mm, dan 12 mm. Total benda uji  yang digunakan sebanyak 16 benda uji. Metode pengujian menggunakan pedoman ASTM F1575 dengan metode three point loading. Hasil penelitian menunjukkan bahwa nilai kuat leleh lentur (rata-rata) semakin kecil apabila diameter baut semakin besar, yaitu Fyb  untuk baut 8 mm sebesar 1121,40 MPa dengan C.O.V sebesar 4,23 %, untuk baut 10 mm sebesar 642,19 MPa (C.O.V 4,80 %), dan untuk baut 12 mm sebesar 631,76 MPa (C.O.V 1,24 %). Secara umum, kurva hubungan antara tegangan-regangan hasil uji lentur baut tersebut menunjukkan tren berbentuk bilinier.
NON-LINIER COMPRESSION STRESS-STRAIN CURVE MODEL FOR HARDWOOD Tjondro, Adhijoso; Suryoatmono, Bambang; Imran, Iswandi
MEKANIKA Vol 1, No 1 (2016)
Publisher : MEKANIKA

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Abstract

Non-linier compression stress-strain relationship was derived from experimental investigation of 144 small clear specimens of three Indonesian hardwood species, namely Acacia, Meranti and Kruing. Both compression parallel to the grain and compression perpendicular to the grain were tested. The stress-strain curve consists of linier-elastic line until proportional limit and bi-linier curve. Stress-strain curve parameters for compression parallel to the grain, such as elastic modulus, post-elastic modulus, proportional limit, ultimate stress and post-elastic strain limit were derived based on the specific gravity. And also stress-strain curve parameters for compression perpendicular to the grain, such as elastic modulus, post-elastic modulus and proportional limit were derived based on the specific gravity and the angle between stress direction and tangential axis direction. Compression strength perpendicular to the grain in tangential direction was found much lower than compression strength perpendicular to the grain in radial direction.
ACACIA GLULAM WOOD EXTERIOR BEAM-COLUMN CONNECTION WITH ANGLES AND STEEL ROD SYSTEM Simanta, Djoni; Suryoatmono, Bambang; Tjondro, Johannes Adhijoso
MEKANIKA Vol 1, No 1 (2016)
Publisher : MEKANIKA

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Abstract

Two models of acacia glulam wood exterior beam-column connections with angles and steel rod system under monotonic static loads were tested and analyzed. The variation of the specimen was number of rod and thickness of angles attached at the beam. The behavior of each model under static loading, maximum displacement, maximum moment, rotational stiffness and ductility were observed. M9B1 type connections have more flexible than M9B2 type connections. The behavior of connection was depened on number of bearing steel rods at the beam, wood quality and thickness of the angles.
Studi Eksperimental Batang Tekan Baja Canai Dingin Diperkaku Sebagian Sandjaya, Arif; Suryoatmono, Bambang
Jurnal Teknik Sipil Vol 25, No 1 (2018)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1808.453 KB) | DOI: 10.5614/jts.2018.25.1.3

Abstract

Abstrak Struktur baja canai dingin saat ini populer digunakan karena ringan, mudah digunakan, dan cepat dalam konstruksi. Kelemahan struktur baja canai dingin adalah tekuk lokal yang disebabkan tipisnya elemen penampang. Hal tersebut menyebabkan kegagalan struktur terjadi sebelum mencapai kapasitas beban tertinggi. Dalam penelitian ini, dua buah profil baja canai dingin yang disusun bersama pada bagian punggung dengan punggung sebagai batang tekan akan ditambahkan pengaku dengan tiga pola penempatan berbeda untuk meningkatkan ketahanan terhadap tekuk lokal. Hasil pengujian menunjukkan ketahanan terhadap tekuk lokal meningkat akibat berkurangnya panjang tekuk kritis sedangkan cara menempatkan pengaku tidak memberikan berpengaruh. Korelasi hasil kekuatan tekan antara perbedaan penempatan pengaku secara eksperimental diverifikasi menggunakan SNI 7971:2013 dan analisis elemen hingga.AbstractThe cold formed steel structure is currently popularly used because it is lightweight, easy to use, and fast in construction. The weakness of cold formed steel structures is the local buckling caused by the thinness of the cross-sectional elements. This causes structural failure occurs before it reaches the highest load capacity. In this study, two cold formed steel profiles arranged together on back to back as compression member will be added stiffeners with three different placement patterns to improve local buckling resistance. The test results showed increased resistance to local buckling due to the reduced length of the critical buckling while the way of placing stiffeners not give effect. The correlation of compressive strengths between experimental confinement placement differences was verified using SNI 7971: 2013 and finite element analysis. 
Analisis Nonlinier Tekuk Torsi Lateral pada Balok Baja Cellular Hung, Benny Gunawan; Suryoatmono, Bambang
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 25, Nomor 2, DESEMBER 2019
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (783.126 KB) | DOI: 10.14710/mkts.v25i2.23674

Abstract

One of many buckling modes that could occur on the beam is lateral-torsional buckling. Lateral torsional buckling could result in lateral deformation and torsion of section. In the AISC 360-16 Spesification, an equation is provided to calculate lateral-torsional buckling critical moment of prismatic I section beam. For cellular beams (I section beam with circular openings), AISC Design Guide 31 states that the lateral-torsional buckling critical moment should be checked in accordance with AISC Specification using gross section properties. With this assumption, thus, the design guide ignores the existence of circular opening on the web, which can cause a reduction of lateral-torsional buckling critical moment. In this study, lateral-torsional buckling analysis on cellular beam with simple support loaded by distributed transversal load has been done - the analysis utilized finite element based software. From the analysis, the critical moment is lower than AISC 360-16 critical moment with the assumption of prismatic I section beam, with the maximum difference percentage of 43,58%. Based on this study, a correction factor has been obtained to estimate the critical moment of cellular beams by using equation on AISC 360-16. 
Studi Mengenai Metode Superposisi Ragam Efektif Untuk Struktur Dengan Redaman Non-Klasik Dennie Supriatna; Bambang Suryoatmono
Jurnal Teknik Sipil Vol 2, No 2 (2011): Oktober
Publisher : Universitas Bandar Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (964.104 KB) | DOI: 10.36448/jts.v2i2.270

Abstract

Metode percepatan ragam dan metode truncation augmentation, memperbaiki cara metode superposisi ragam standar dengan melengkapi bagian ragam yang terpotong. Kedua metode ini sudah digunakan untuk struktur teredam secara klasik. Untuk mengaplikasikan kedua metode ini pada sistem dengan redaman non-klasik, sistem ini harus didekati dengan sistem redaman klasik.Setiap metode merupakan suatu ekspansi menuju sistem teredam secara non-klasik untuk analsisis yang efisien dan akurat tanpa memodelkan struktur sebagai sistem teredam secara non-klasik. Pendekatan state space digunakan untuk ekspansi pada kedua metode.Keabsahan kedua metode diverifikasi secara analisis dan numerik. Kestabilan metode modal truncation augmentation bergantung pada beban luar. Sehingga stabiltas metode ini sangat ditentukan oleh pembebanan tersebut. Sedangkan untuk metode percepatan ragam tidak dideterminasi oleh kondisi kestabilan tersebut. Pada kondisi stabil, kedua metode menghasilkan output yang sama.
Nonlinear Finite Element Modeling of Red Meranti Compression at an Angle to the Grain Yosafat A. Pranata; Bambang Suryoatmono
Journal of Engineering and Technological Sciences Vol. 45 No. 3 (2013)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | 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.
Co-Authors Adhijoso Tjondro Adhijoso Tjondro Adrian Pramudita Dharma Arif Sandjaya Dennie Supriatna Djoni Simanta Erwin Sanjaya Fenita Adina Santoso Helmy Hermawan Tjahjanto Hung, Benny Gunawan Iswandi Imran Johannes Adhijoso Tjondro Nessa Valiantine Diredja Simanta, Djoni Tumena, Fedora Marleen Wijaya, Naga Yosafat A. Pranata Yosafat A. Pranata Yosafat Aji Pranata Yosafat Aji Pranata Yosafat Aji Pranata Yosafat Aji Pranata