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All Journal Teknisia Teras Jurnal Jurnal Teknik Sipil dan Perencanaan
Teguh, Mochamad
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Civil Engineering, Building, Construction & Architecture Engineering Environmental Science

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Mechanical properties of High-Strength concrete with bauxite sand as partial fine aggregate replacement Azzahra, Putri Yasmin; Teguh, Mochamad
Teknisia Vol 30 No 1 (2025): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol30.iss1.art2

Abstract

Concrete is a key material in Indonesia’s infrastructure development, with growing interest in sustainable alternatives to natural aggregates. This study evaluates the mechanical performance of high-strength concrete incorporating bauxite sand as a partial replacement for fine aggregate. The control mix (BMT-0) was designed with a water–cement ratio of 0.3 and a cement content of 550 kg/m³, using natural sand and crushed coarse aggregate, without any chemical admixtures. Four additional mixes (BMT-1 to BMT-4) included bauxite sand at replacement levels of 2.5%, 5%, 7.5%, and 10% by weight of fine aggregate. A total of 30 specimens were tested to assess compressive strength, splitting tensile strength, and modulus of elasticity. All mixes exceeded the minimum compressive strength requirement for high-strength concrete (41.4 MPa). The mix with 5% bauxite sand replacement (BMT-2) demonstrated the highest compressive strength (49.33 MPa) and tensile strength (3.46 MPa), while the 7.5% mix (BMT-3) achieved the highest modulus of elasticity (38,877.32 MPa). The results suggest that partial replacement of fine aggregate with 5% bauxite sand enhances concrete quality without compromising mechanical performance.
Structural Response of Irregular Buildings: Influence of Geometry and Shear Wall Configurations Teguh, Mochamad; Pratama, Aditia Ilham
Jurnal Teknik Sipil dan Perencanaan Vol. 27 No. 1 (2025): Jurnal Teknik Sipil dan Perencanaan
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v27i1/12467

Abstract

This paper delves into the structural response of irregular buildings, specifically focusing on the influence of geometry and shear wall configurations. Irregular buildings, with their intricate geometries and diverse structural elements, present unique design challenges, necessitating a thorough performance evaluation. Our study conducts a comparative analysis to gauge the impact of various geometric layouts and shear wall arrangements on structural behavior under seismic loading. A nine-story irregular building in Yogyakarta, Indonesia, is a compelling case study. We develop three models (M1, M2, and M3), each incorporating variations in geometry and shear wall configurations (T-shaped, L-shaped, and I-shaped). These models are rigorously analyzed using ETABS software to evaluate key structural responses, including lateral displacement, inter-story drift, and base shear forces. The results reveal that M3 exhibits the lowest base shear, at 24,961.46 kN, 7.582% lower than the existing model (M1). The lowest lateral displacements and inter-story drifts are observed in the x-direction for M2 (26.308 mm displacement, 10.061 mm drift) and in the y-direction for M3 (26.115 mm displacement, 9.339 mm drift). Additionally, the lowest drift ratio occurs on the first floor of M3, measuring 0.110% in the x-direction and 0.115% in the y-direction. These findings underscore the substantial impact of geometric variations and shear wall configurations on the structural response, providing valuable insights into optimizing irregular building designs to enhance seismic performance.
Perbandingan Respon Dinamis Pada Struktur Bangunan Bertingkat Tidak Beraturan Dengan Tiga Varian Konfigurasi Dinding Geser muna, mukhammad nailul; Teguh, Mochamad
Teras Jurnal : Jurnal Teknik Sipil Vol. 14 No. 2 (2024): Volume 14 Nomor 2, September 2024
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v14i2.1114

Abstract

Abstrak Artikel ini menyajikan hasil perbandingan respon struktur terhadap 3 variasi konfigurasi dinding geser pada bangunan bertingkat yang tidak beraturan pada denah. Konfigurasi dinding geser difokuskan pada letak dan bentuk dinding geser pada struktur gedung beton bertulang sembilan lantai dengan denah tidak beraturan dan terletak di daerah rawan gempa. Penelitian ini bertujuan untuk menganalisis respon struktur tidak beraturan pada gedung eksisting untuk dibandingkan dengan 2 model hasil modifikasi dinding geser. Analisis struktur untuk 3 model konfigurasi dinding geser digunakan software ETABS. Hasil analisis respon struktur terendah menunjukkan base shear sebesar 21548,528 kN. deflection arah x dan y masing-masing sebesar 56,47 dan 48,48 (mm). Story drift arah x dan y sebesar 10,589 dan 8,796 (mm), sedangkan drift rate terendah pada arah x dan y sebesar 0,212 dan 0,176 (%). Dari hasil tersebut dapat disimpulkan bahwa respon struktur pada gedung eksisting lebih optimum baik letak maupun bentuk dinding geser dibandingkan 2 model lainnya. Kata kunci: simpangan; simpangan-antar-tingkat; gedung-ireguler; beban-dinamis Abstract This article compares structural responses to three variations of shear wall configurations in irregular multi-story buildings in the plan. The shear wall configuration is focused on the location and shape of the shear wall in a nine-story reinforced concrete building structure with an irregular plan located in an earthquake-prone area. This study aims to analyze the response of irregular structures in existing buildings to compare with two modified shear wall models. Structural analysis for three shear wall configuration models used ETABS software. The lowest structural response analysis results showed a base shear of 21548.528 kN. Deflection in the x and y directions were 56.47 and 48.48 (mm), respectively. Story drift in the x and y directions was 10.589 and 8.796 (mm). At the same time, the lowest drift rate in the x and y directions was 0.212 and 0.176 (%). From these results, it can be concluded that the structural response in existing buildings is more optimal in both the location and shape of the shear wall compared to the other two models. Key words: displacement; drift-ratio; irregular-building; dynamic- load
Co-Authors Azzahra, Putri Yasmin muna, mukhammad nailul Pratama, Aditia Ilham