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All Journal Inersia : Jurnal Teknik Sipil dan Arsitektur Jurnal Teknik Sipil Rekayasa Mesin Jurnal Rekayasa Mesin Civil Engineering Dimension Journal of Architectural Research and Design Studies Astonjadro Jurnal Permukiman Jurnal Engine: Energi, Manufaktur, dan Material Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Jurnal Teknik Sipil Macca Journal of Engineering and Technological Sciences
Irawati, Inggar Septhia
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Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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BambuFlex – a Digital Form-Finding Tool for Curved Bamboo Structure based on Indonesian Bamboo Hardiansyah, Wisnu Agung; Kusumawanto, Arif; Irawati, Inggar Septhia
Journal of Architectural Research and Design Studies Vol. 8 No. 1 (2024)
Publisher : Departement of Architecture, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jars.vol8.iss1.art3

Abstract

Contemporary bamboo buildings with curved structures have recently gained popularity despite their challenging nature to design and construct. The inherent material characteristic must be incorporated into the design process, often called form-finding. The typical form-finding approach in Indonesia incorporates physical mediums known to be complex and laborious. On the contrary, the digital medium is rarely used due to the lack of tools capable of performing quick and accurate form-finding while incorporating local bamboo and bending methods. This paper showcases BambuFlex, a digital tool that performs quick and accurate form-finding based on local bamboo and bending approaches in Indonesia. The algorithm’s capability was validated by comparing its accuracy and real-time material feedback with the conventional physical method. The result shows that BambuFlex is able to provide accurate and materially informed form-finding, but it has some limitations. To conclude, BambuFlex can complement the conventional physical form finding, allowing architects to explore more design alternatives rapidly. Keywords: bending-active bamboo structure, digital form-finding, local bending method
PERANCANGAN SISTEM HIDROLIK PADA MESIN PRESS BAMBU LAMINASI Gumilang, Theo Satria; Krisnaputra, Radhian; Sugiyanto, Sugiyanto; Hendaryanto, Ignatius Aris; Irawati, Inggar Septhia; Bahari, Galuh
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1484

Abstract

The hydraulic system is a power transmission system by using the compressive energy of the fluid into mechanical energy to obtain a power greater than the initial power released. The press machine is one of the pieces of equipment that apply the hydraulic system. In the process of making laminated bamboo, the bamboo gluing technique is assisted using a press machine. Based on observations, the press machine used is a manual press machine, so the pressing process is not efficient. This study aims to increase the effectiveness of pressing laminated bamboo. The results of the study found that the press machine has 4 hydraulic cylinders so the pressing process can be carried out at several points simultaneously. The results of the hydraulic system analysis diagram show hydraulic cylinder moves in 16,9 seconds with a pressure of 100 bar, so the pressing process is fast. Mathematical calculations produce data, a hydraulic gear pump with a displacement of 13 cc/rev, electric motor power of 3,7 kW, hydraulic cylinder diameter of 63 mm, cylinder rod of 35 mm, rod of 400 mm, and a hydraulic tank capacity of 12 liters.
Thermomechanical Analysis of Cement Hydration Effects in Multi-layered Pier Head Concrete: Finite Element Approach Ahmad, Mohammad Ismail Ramadan; Irawati, Inggar Septhia; Awaludin, Ali; Siswosukarto, Suprapto
Journal of Engineering and Technological Sciences Vol. 56 No. 5 (2024)
Publisher : Directorate 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.2024.56.5.7

Abstract

Mass concrete plays a crucial role in infrastructure development, yet its complex thermo-mechanical behavior poses challenges, especially in the construction of multi-layered structures like pier heads. This study investigated the thermo-mechanical behavior of a pier head during its concreting process in three stages, including the influence of temperature differences that impact the thermomechanical balance of the concrete. By utilizing the ABAQUS software, thermo-mechanical analysis was conducted to simulate temperature fluctuations during cement hydration. The model integrates thermal analysis to simulate temperature fluctuations during cement hydration and stress distribution during construction, validated through mesh convergence studies and field data comparison. The mechanical analysis considered concrete properties, temperature variations, and construction phase. Nonlinear material behavior and contact interactions between layers were incorporated to obtain a realistic simulation. The results indicated that a multi-layer system can balance temperatures, reducing thermal stress-induced cracking risks. Furthermore, specific test points within the pier head were assessed, revealing potential internal cracks by comparing thermal stresses to the concrete’s tensile strength. This research offers insight into pier head conditions during construction, highlighting critical stress zones, crack prediction, and construction sequence efficacy.
Experimental Study of Screw Withdrawal in Acacia Cross-Laminated Timber (CLT) Ferry, Ferry; Awaludin, Ali; Irawati, Inggar Septhia
ASTONJADRO Vol. 14 No. 4 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i4.19268

Abstract

This study examines the screw withdrawal strength in Acacia Cross-Laminated Timber (CLT) using screws of 5 mm diameter. CLT, typically made from softwoods, is gaining interest with hardwoods like Acacia for enhanced structural performance. The study evaluated screw withdrawal resistance across face, edge, and end grain orientations, following EN 1382 standards. The results showed that the face grain orientation exhibited the highest average withdrawal strength of 6.7 kN with a specific strength of 10.6 N/mm², while the edge grain had 6.5 kN and 10.3 N/mm². The end grain had the lowest strength with an average of 4.0 kN and 6.3 N/mm². Additionally, higher wood density was found to increase withdrawal strength, with heavier samples showing greater performance. These findings emphasize Acacia’s potential for structurally optimized CLT applications.
Assessment and Strengthening of Bolted Connections in the Mandomai Bowstring Bridge Constructed with Ulin Wood Subchan, Shafira Khairunnisa; Awaludin, Ali; Akbar, Miqdad Khosyi; Tama, Radika Gandi; Setiawan, Angga Fajar; Yudhistira, Angga Trisna; Irawati, Inggar Septhia; Triwiyono, Andreas
Civil Engineering Dimension Vol. 28 No. 1 (2026): MARCH 2026
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.28.1.101-110

Abstract

This study assessed and proposed a retrofit strategy for bolted timber connections in the Mandomai pedestrian bridge, constructed from Ulin wood (Eusideroxylon zwageri). Numerical modeling, analytical evaluation using Eurocode 5 yield equations, and experimental validation were conducted. Axial forces from a global Midas Civil model under a 1.25 kN/m² live load showed three critical connections (S11, S13, S14) with demand-capacity ratios (DCR) exceeding 1.0. A retrofit using steel side plates and ASTM A325 bolts reduced DCRs to 0.79, 1.02, and 0.70, respectively. Experimental testing of limited full-scale double-shear wood-to-wood joints demonstrated an average ultimate capacity of 191 kN, which was 57.65% higher than the theoretical prediction, indicating the conservative nature of Eurocode 5 and the contribution of mechanisms such as the rope effect and frictional interlock. The results confirmed the retrofit’s effectiveness and highlighted the need to refine design provisions for dense tropical hardwoods.
Co-Authors Ahmad, Mohammad Ismail Ramadan Akbar, Miqdad Khosyi Ali Awaludin Aminullah, Akhmad Andreas Triwiyono Arif Kusumawanto Awaluddin, Ali Bahari, Galuh Balqis, Ratu Irmi Dwi Yulianto Ferry, Ferry Gumilang, Theo Satria Hardiansyah, Wisnu Agung Henricus Priyosulistyo, Henricus Ignatius Aris Hendaryanto Junaid, Annisa Kurniawan, Redho Nugroho, Arief Setiawan Budi Radhian Krisnaputra Ramadhan, Muhammad Aulia Nur Satiti, Nareswari Novita Setiawan, Angga Fajar Subchan, Shafira Khairunnisa Sugiyanto - Suprapto Siswosukarto Tama, Radika Gandi TATI NURHAYATI Wusqo, Urwatul Yudhistira, Angga Trisna Yusuf, Effendi