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Eko Walujodjati
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Pengaruh Limbah Abu Ampas Kopi Garut terhadap Kuat Lentur Beton Marsalina, Sali; Walujodjati, Eko
Jurnal Konstruksi Vol 23 No 1 (2025): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.23-1.1805

Abstract

The development of coffee shop businesses in Garut has contributed to the increase in coffee grounds waste, which can pollute the environment. One of the uses of coffee grounds waste is as a substitute for part of the cement in concrete. Coffee grounds ash contains silica which is pozzolanic in concrete. The purpose of this study was to determine the effect of coffee grounds ash as a partial cement substitute on the flexural strength of concrete. The study was conducted using an experimental method using variations of coffee grounds ash of 3%, 6%, and 9% as a partial cement substitute in concrete with a design quality of K-300 (fc’ 25 MPa) and testing at a concrete age of 28 days. Compressive strength testing was carried out on cube test specimens (15 cm x 15 cm x 15 cm) and flexural strength on beams (10 cm x 18 cm x 60 cm), each with 3 samples per variation. The test was guided by SNI 7656:2012. The results showed that increasing the content of coffee grounds ash reduced the strength of concrete. The average compressive strength of normal concrete is 217.72 kg/cm2, decreasing to 198.20 kg/cm2 with a percentage decrease of (8.96%) at a content of 3%, 182.13 kg/cm2 (16.35%) at a content of 6%, and 150.22 kg/cm2 (31.01%) at a content of 9%. This study shows that although coffee grounds ash has the potential as an environmentally friendly material, its use as a partial replacement of cement in concrete with a content of more than 3% actually weakens the mechanical properties of the concrete. Therefore, further research is needed with a lower substitution content or a combination with other additives to improve concrete performance.
Kajian Struktur Terowongan Proyek Bintaro Jaya Xchange Mall Walujodjati, Eko; Fahmi, Muhammad Zaki; Fathir, Mirza
Jurnal Konstruksi Vol 23 No 1 (2025): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.23-1.1879

Abstract

The construction of the tunnel structure of this mall project is intended for the construction of a tunnel under the Jakarta-Serpong toll road. This tunnel project has a length of 160 m and was built in 2022. The reason for taking this study was to determine how large the capacity is and prove that the tunnel structure is included in the safe and unsafe category of the structure. This research in this analysis was carried out using a manual calculation method and assisted by Microsoft Excel software to evaluate the structural strength, shear capacity, and moment capacity of the beam and column structures. As for the results of the study for the flexural reinforcement in the beam, the Mn value was obtained as 218370.52 KNm and Mu as 4572.55 kNm indicating that the structure or element has sufficient moment capacity to withstand the applied load. Furthermore, for the shear reinforcement, the Vs value is 1326.524 kN and the Vmax value is 1424.079 kN indicating that the shear force provided by the shear reinforcement (Vs) of 1326.524 kN is still below the maximum shear force that can be withstood by the element (Vsmax) of 1424.079 kN. While for the column structure section on the flexural reinforcement, the Pn value needs to be 481.23 kN and the Pnb value of 4,404.27 kN indicates that the structure has met the safety capacity and for the shear reinforcement, the Vu value is 156.40 kN and the value of 179.93 kN indicates that the structure has met the safety capacity. It can be concluded that the tunnel structure is safe and suitable for use by vehicles.
Analisis Stabilitas Dan Tegangan Bendungan RCC (Rolled-Compacted Concrete) Pada Pembangunan Bendungan Cibeet Walujodjati, Eko; Aprilianti, Mega; Permana, Sulwan
JURNAL TEKNIK SIPIL Vol 14, No 1 (2025): Volume 14 Nomor 1 Mei 2025
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jts.v14i1.40341

Abstract

Bendungan merupakan struktur penting yang berfungsi untuk menyimpan air dan mengatur alirannya sesuai dengan kebutuhan. Mengingat salah satu tujuan dibangunnya Bendungan Cibeet ini adalah untuk dapat mereduksi banjir yang terjadi di hilir sungai Citarum sebesar 66% pada Q25 yaitu 300,33 m3/det, analisis menyeluruh terhadap stabilitas dan tegangan pada tubuh bendungan menjadi langkah krusial dalam proses konstruksi. Penelitian ini bertujuan untuk menganalisis stabilitas dan distribusi tegangan pada bendungan tipe RCC (Rolled-Compacted Concrete) di sisi kanan Bendungan Cibeet pada tujuh kondisi pembebanan. Perhitungan manual dilakukan menggunakan metode keseimbangan gaya-gaya untuk menilai faktor keamanan terhadap guling, geser, dan daya dukung tanah pada bendungan. Sementara itu, nilai dan distribusi tegangan dianalisis menggunakan perangkat lunak berbasis Metode Elemen Hingga (Finite Element Method, FEM) yaitu Abaqus Learning Edition 2023. FEM merupakan langkah numerik yang dipakai dalam menyelesaikan berbagai permasalahan di bidang teknik. Hasil analisis menunjukan bahwa nilai FKguling paling kecil terjadi pada Kondisi VI sebesar 4,198 yang masih lebih besar dari 1,15. FKgeser paling kecil terjadi pada Kondisi I yaitu kondisi selesai konstruksi dengan nilai FKgeser 6,63 yang masih lebih besar dari 1,7. Tinjauan daya dukung tanah menunjukan tegangan paling besar diperoleh sebesar 0,707 terjadi pada Kondisi VII dengan batas maksimal tegangan sebesar 2,57 MPa, sedangkan tegangan minimum terjadi pada Kondisi II yaitu kondisi muka air waduk normal sebesar 0,206 MPa dengan batas minimum tegangan 0. Tegangan maksimum hasil analisis diperoleh sebesar 0,718 MPa yang terjadi pada pembebanan Kondisi VI dan masih dibawah dari batas maksimal tegangan yang diizinkan yaitu 2,67 MPa.
Pengaruh Perubahan Dimensi Kolom pada Perhitungan Struktur Tahan Gempa Gedung Beton Bertulang Maulidan, Ripan; Walujodjati, Eko
Jurnal Konstruksi Vol 23 No 2 (2025): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.23-2.1607

Abstract

Columns are one of the structural elements that play a crucial role in supporting the strength of a building, and therefore require careful calculation when determining their dimensions. In the structural planning of the Cisaga Community Health Center (Puskesmas), there were several changes in the column dimensions to be used. The objective of this study is to understand the impact of these dimension changes on the seismic force calculations and reinforcement design of structural elements, particularly columns. The structural modeling was carried out through three-dimensional simulation using the ETABS V19 structural analysis program. Calculations were based on SNI 1726-2019 and SNI 2847-2019 standards. Based on the analysis, the building with 450 x 450 mm columns experienced a maximum seismic force that differed by 27% compared to the building with 300 x 300 mm columns. The maximum displacement occurred on the second floor, where the 300 x 300 mm column configuration resulted in 69% greater displacement in the x-direction and 71% in the y-direction. The reinforcement calculation for the 450 x 450 mm column yielded a main reinforcement ratio of 1.68%, whereas the 300 x 300 mm column required 5.04%. The 450 x 450 mm column also produced a greater stirrup spacing in the plastic hinge region compared to the 300 x 300 mm column. Larger column dimensions result in greater shear and seismic forces acting on the structure. The larger the column dimensions used, the greater the building’s stiffness against seismic loads.
Pengujian Kuat Tekan dan Kuat Tarik Belah Beton Dengan Bahan Tambah Limbah Polyvinyl Chloride (PVC) Yogi Wibowo, Tri; Walujodjati, Eko
Jurnal Konstruksi Vol 23 No 2 (2025): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.23-2.2376

Abstract

PVC is a thermoplastic polymer that ranks third in global usage, after polyethylene and polypropylene. Polyvinyl Chloride (PVC) is one of the most difficult types of plastic to recycle. Utilizing this waste efficiently presents a significant challenge; however, if PVC waste can be technically proven suitable as a material or aggregate in concrete mixtures, it could help reduce environmental pollution. The purpose of this study is to examine the effect of PVC waste as an additive on the compressive and splitting tensile strength of concrete. The research was carried out experimentally in a laboratory setting, using three variations of concrete mixtures: normal concrete, concrete with 3% PVC, and concrete with 6% PVC, based on the weight of the coarse aggregate. A total of 18 samples were prepared, with a planned concrete strength of fc’ = 20 MPa. Concrete testing was performed at 28 days of curing, referring to the Indonesian National Standard SNI-03-1974-2011. The results showed that the average compressive strength values were 11.31 MPa for normal concrete, 13.58 MPa for concrete with 3% PVC, and 16.59 MPa for concrete with 6% PVC. In contrast, the average splitting tensile strength values were 4.29 MPa for normal concrete, 3.70 MPa for concrete with 3% PVC, and 3.11 MPa for concrete with 6% PVC. These findings indicate that the addition of PVC waste improves compressive strength but reduces tensile strength, suggesting that while PVC waste can enhance certain structural properties, it does not meet the requirements for tensile reinforcement in concrete mixtures.
Analisis Pengaruh Variasi Penempatan Dinding Geser Terhadap Perilaku Struktur Gedung Akibat Beban Gempa Hidayatullah, Irfan; Walujodjati, Eko
Jurnal Konstruksi Vol 23 No 2 (2025): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.23-2.2605

Abstract

Indonesia is located in the Pacific Ring of Fire, so it has many active faults that increase the risk of earthquakes, including in Tasikmalaya. To reduce damage to buildings caused by earthquakes, earthquake-resistant structural planning is required, one of which is the use of shear walls. This study aims to analyze the effect of varying shear wall placements on base shear forces, inter-story drifts, and P-Delta effects. The analysis was performed numerically using ETABS (Student Version) software with the response spectrum method based on SNI 1726:2019. Three shear wall placement models were used: model 1 according to existing conditions, model 2 in the middle of the building, and model 3 at the corner of the building. The analysis results show that model 2 provides the best response. The base shear force reached 1,422.6 kN, the inter-story drift was 7.49 mm in the X direction and 5.46 mm in the Y direction, remaining below the maximum limit. The P-Delta effect in model 2 was also the lowest and most consistent, with a maximum value of 0.0031 in the X direction and 0.0022 in the Y direction. Therefore, placing shear walls in the center of the building was most effective in improving the structure's performance against seismic loads. These findings can provide practical input for structural designers in determining the placement strategy for shear walls in multi-story buildings in earthquake-prone areas.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Chalid, Nugi Andriansyah, Danil Aprilianti, Mega Devi, Marta Resmana Fahmi, Muhammad Zaki Fathir, Mirza Ghilman, Rafiqan Mochammad Hidayatullah, Irfan Intan Nuriskha Rachma Kristalia, Risa Marsalina, Sali Maulidan, Ripan Nurliana, Ade Linda Pratama, Rama Reno Rukanda, Reno Sauri Al Qurthubi, Sopyan Sulwan Permana Wiguna, Andreansyah Yogi Wibowo, Tri Yusup, Arip