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All Journal BAREKENG: Jurnal Ilmu Matematika dan Terapan International Journal of Engineering, Technology and Natural Sciences (IJETS) Indonesian Journal of Computing, Engineering, and Design
Sahputra, Deded Eka
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Arts Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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Journal : Indonesian Journal of Computing, Engineering, and Design

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Performance Analysis of Regular and Irregular Horizontal Multi-Story Buildings Structure Fernando, Figo; Sahputra, Deded Eka; Fatchurrohman, Nanang
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 7 No. 2 (2025): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35806/ijoced.v7i2.554

Abstract

This study investigates the effect of building shape on seismic performance in earthquake-prone areas such as Padang City. Using the Indonesian seismic standard SNI 1726:2019, three multi-story reinforced concrete buildings were modeled: a square (regular), a rectangular (regular), and an irregular plan. The analysis focused on internal forces, base shear, displacement, and drift ratio to evaluate differences in structural response. Results show that buildings with horizontal irregularities experience higher internal forces and displacements. The bending moments in irregular buildings are 4.84% higher than in rectangular buildings and 10.07% higher than in square buildings. Base shear is 1.53% and 3.04% higher, respectively. The maximum displacement differences reach 0.93 m (X direction) and 0.54 mm (Y direction). The average drift ratio in the X direction is about 0.56% for all models, while square-shaped buildings show smaller Y-direction drift. These findings highlight that plan irregularities significantly influence seismic performance, providing insights for safer structural design in seismic regions.
Mechanical Properties of Sustainable Paving Blocks Using Fly Ash and Polypropylene Plastic Waste Sahputra, Deded Eka; Fakhrul Siddiq; Nanang Fatchurrohman
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 8 No. 1 (2026): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35806/ijoced.v8i1.596

Abstract

The increasing generation of industrial and plastic waste has encouraged the development of sustainable construction materials. This study investigates the mechanical properties of zero-cement paving blocks utilizing Polypropylene (PP) plastic waste as the sole binder and fly ash as a sand substitute. A direct thermo-mechanical melting process at 180°C–200°C was employed without the use of water or chemical activators. To ensure sufficient binder volume, the PP ratio was fixed at 4 parts. Specimens were tested for compressive strength and water absorption according to the Indonesian National Standard (SNI 03-0691-1996). The results demonstrated a clear dependency between the filler ratio and mechanical performance; a 25% substitution of sand with fly ash achieved the optimal performance, yielding a maximum compressive strength of 11.59± 0.84 MPa and a remarkably low water absorption rate of 0.75 ± 0.31%, while the lowest water absorption of 0.62 ± 0.07% was achieved by the control mixture. However, increasing the fly ash substitution to 50% resulted in a strength reduction due to the inability of the fixed PP matrix to completely encapsulate the high surface area of the fine fly ash particles. Although classified as Quality D paving blocks, this purely waste-derived composite presents a highly viable, eco-friendly solution specifically targeted for light-duty infrastructure applications, such as pedestrian walkways and city parks.  
Co-Authors Fakhrul Siddiq Fatchurrohman, Nanang Fernando, Figo Imani, Rafki Nanang Fatchurrohman Nasmirayanti, Rita