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INDONESIA
Teknisia
Published by Universitas Islam Indonesia
ISSN : 08538557     EISSN : 27460185     DOI : 10.20885/teknisia
Core Subject : Engineering,
Engineering
Jurnal Teknisia terbit pertama kali pada bulan April 1996. Pada awal berdirinya, Jurnal Teknisia merupakan jurnal ilmiah berkala yang diterbitkan tiga kali setahun oleh Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia, Daerah Istimewa Yogyakarta yang berisi artikel-artikel bidang teknik sipil, teknik lingkungan, dan arsitektur.
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Articles 137 Documents
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Mapping the land movement level of Langsa Baro district using the Geographic Information System (GIS) Riyan, Muhammad Alfriyandi; Ellida Novita Lydia; Eka Mutia; Arisna Fauzia
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.art5

Abstract

Langsa Baro District is an area that often experiences floods and a lot of uneven elevation in the area so that land movement can be possible. This study aims to analyze the parameters that affect soil movement and make a zoning map of the level of vulnerability of land movement using spatial data in Langsa Baro District. Data processing with GIS (Geographic Information System) is intended to obtain soil movement mapping. To help determine the weight score on each parameter, this study used the AHP (Analytic Hierarchy Process) method. Factors that greatly influence the occurrence of soil movement that occurs in Langsa Baro District are soil type and rainfall. The Langsa Baro District area has five levels of vulnerability, namely the level of vulnerability of very low soil movement with a percentage of 0.26% and area of 17.02 Ha, the level of vulnerability of low soil movement with a percentage of 3.58% and an area of 234.02 Ha, the level of vulnerability of medium soil movement with a percentage of 18.42% and an area of 1204.22 Ha, the level of vulnerability of high soil movement with a percentage of 73.74% and an area of 4819.54, the level of vulnerability of soil movement is very high with a percentage of 4.00% and an area of 261.26 Ha.
Prediction of pavement condition using markov chain method based on PCI and SDI assessment result Hakim, Indri Nurtiyani; Fauziah, Miftahul; Chasanah, Faizul
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.art4

Abstract

A pavement management system needs to be implemented as a form of road management to ensure that roads function properly. The Markov Chain model describes future pavement conditions to produce optimal highway maintenance. The research was carried out on Suprapto Street, Ahmad Yani Street, and Yos Sudarso Street in Indramayu Regency. Based on road conditions in 2024 by PCI and SDI assessment results, predictions are made by multiplying the initial condition vector by the transition probability matrix. Once the condition of the road is known, the proposed type of maintenance can be determined based on Ministerial Regulation of Public Work No. 13/PRT/M/2011, along with the costs required based on the maintenance cost history. The Markov Chain predictions show that road conditions will deteriorate and there will be an increase in severe damage over the years if no treatment is carried out. Maintenance action patterns vary; sections that experience a high level of damage will receive more serious treatment, and in the following year maintenance will decrease and then increase again according to the level of damage. The pattern of maintenance costs also follows the handling actions taken. Costs in the initial year were the highest, while most costs were spent on Suprapto Street.
Evaluation of seismic site amplification factors in Yogyakarta using One-Dimensional site response analysis Marasabessy, Muhammad Irfan; Saputra, Elvis; Basarah, Yuamar I
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.art1

Abstract

This study evaluates seismic site amplification in Yogyakarta using one-dimensional (1D) nonlinear site response analysis. Subsurface conditions were characterized using borehole and Standard Penetration Test (SPT) data from four different locations. Ground motion records were selected and matched to the seismic hazard target spectrum at the bedrock level in Yogyakarta. The nonlinear site response analysis was then used to propagate the seismic waves to the ground surface using the DEEPSOIL program. The results show de-amplification at short periods (T < 0.5 s) and amplification at longer periods (T > 1 s), The highest amplification is observed at T = 0.15 s, with an average factor of 3.47. A comparison with the Indonesian seismic design code SNI 1726:2019, which shows that the code provides more conservative estimates than the site-specific analysis in this study. The analysis also shows that lower input motion intensity at bedrock (PGA = 0.02g) leads to higher amplification, while higher PGA (up to 0.72g) results in reduced response. This study highlights the need for site-specific analysis and consideration of input motion variability.
HDPE plastic waste as a fine aggregate substitute in the production of CLC lightweight bricks: an experimental study Mg, Taufiqurrahman
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.art6

Abstract

This study aims to examine the utilization of High-Density Polyethylene (HDPE) plastic waste as a partial substitute for fine aggregate in the manufacture of Cellular Lightweight Concrete (CLC) lightweight bricks. The method used is a laboratory experiment with variations in the addition of HDPE of 0%, 5%, 10%, and 15% to the CLC mixture. Each variation was tested to determine the compressive strength, dry unit weight, and water absorption capacity after curing for 28 days. The results showed that the addition of HDPE affected the mechanical characteristics of lightweight bricks. The compressive strength decreased with increasing HDPE percentage, where the highest value was recorded at the 0% HDPE variation of 1.16 MPa and the lowest at the 15% variation of 0.92 MPa, below the SNI 8640-2018 standard. The highest dry unit weight was achieved at a composition of 5% HDPE of 3.32 kg/m³, indicating optimal density. However, the addition of HDPE also increased water absorption, with the highest average of 25.08% at the 15% variation. Thus, the use of HDPE waste as a substitute material shows environmentally friendly potential, but needs to be optimized so as not to reduce the structural quality of CLC lightweight bricks.
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.
Analisis Fluktuasi Jumlah dan Karakteristik Penumpang Bus Trans Jogja Kondisi Sebelum, Selama, dan Setelah Covid-19 Budi Utomo, Rizki; Winarno, Setya
Teknisia Vol 28 No 2 (2023): 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.vol28.iss2.art5

Abstract

Trans Jogja Urban Public Transportation is a form of reform of the subsidized road transport system in the Special Region of Yogyakarta,  which has served the Yogyakarta Urban Area since 2008. Trans Jogja Buses have served 25 sub-districts, with a fleet of 128 buses subsidized by the DIY Regional Government and 44 buses subsidized by the Ministry of Transportation of the Republic of Indonesia. When the COVID-19 pandemic hit in 2020-2021, there was a decrease in people's movements, resulting in a decrease in Trans Jogja Bus passengers. This study aims to analyze the fluctuations of passengers and compare the characteristics of the Trans Jogja Bus passengers in conditions before COVID-19 (in 2019), during COVID-19 (in 2020 and 2021), and after COVID-19 (in 2022). The analysis results show that based on the monthly average, the number of Trans Jogja Bus passengers in conditions during COVID-19 decreased by 54%. After COVID-19, it increased by 12% compared to during COVID-19.  The monthly average number of passengers After COVID-19 is not as regular as in conditions before COVID-19, with a disparity of 50%t. Based on the characteristics of passengers during COVID-19, the proportion of missing passengers is by the professional aspect, namely students/students and civil servants/national soldiers/police. Regarding travel intentions, a relatively large proportion of the missing were college, school, and tourism travel, each decreasing by 7%.
Analisis Potensi Penggunaan Moda Transportasi Tidak Bermotor Pada Mahasiswa di Kampus Terpadu Universitas Islam Indonesia Prayitno, Prayogo Afang; Kemal Fardianto; Faza Fawzan Bastarianto; Muhammad Kennyzyra Bintang; Raihan Pasha Isheka
Teknisia Vol 28 No 2 (2023): 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.vol28.iss2.art4

Abstract

The large number of students is directly proportional to the increase in private vehicles on campus, resulting in traffic congestion. Efforts should be made to encourage motorized vehicle users to switch to sustainable modes of transportation. This study aims to determine student dependence on motorized vehicles to go to campus and identify factors associated with using sustainable modes of transportation at the Universitas Islam Indonesia (UII). The data sample consisted of 614 respondents, collected through online simple random sampling. The collected data were then analyzed using the Chi-Square test. The survey data reveals a significant reliance on motorized vehicles to get to campus, with 67% of trips within a 2-kilometer radius made by motor vehicles. Based on the Chi-Square test results, factors such as motor vehicle ownership, driving license ownership, travel distance, and the primary mode of transportation are strongly associatedwith the willingness to walk or cycle. This condition indicates that practicality or habitual aspects have a stronger relationship with students' willingness to use sustainable transportation than demographic or socioeconomic factors. Thus, efforts are needed to increase the practicality of using sustainable transportation to optimize sustainable campus development.
Laboratory Model Test on The Sand Column for Reinforcement System of Flexible Pavement Fajarwati, Yuli; Dian Eksana Wibowo; Endaryanta; Amalina, Anisa Nur
Teknisia Vol 28 No 2 (2023): 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.vol28.iss2.art1

Abstract

Flexible pavement failures in Indonesia are primarily attributed to weak subgrade conditions, necessitating soil reinforcement measures. This study aimed to enhance soil-bearing capacity through soil reinforcement experiments utilizing a mixture of sand columns, rice husk ash, and cement. A prototype was constructed, including a 1×1×1 m steel box, an IWF steel frame, a dial gauge, a steel plate, and a proving ring, to apply a load to soil arranged within the iron box using a 3-ton hydraulic jack. The study focused on a clay soil type (following the AASHTO method) and conducted soil reinforcement in four scenarios. The result shows that in all scenarios involving a sand column, Scenario 1: 3% sand, 3% rice husk ash, and 6% cement obtained a qult is 0.23 kg/cm2 and BCR 114.94%; Scenario 2: 3% sand, 6% rice husk ash, and 3% cement obtained a qult is 0.12 kg/cm2 and BCR 11.49%; Scenario 3: 6% sand, 3% rice husk ash, and 3% cement obtained a qult is 0.14 kg/cm2 and BCR 26.44%; Scenario 4: 6% sand, 6% rice husk ash, and 0% cement obtained a qult is 0.24 kg/cm2 and a BCR of 116.09%. Notably, scenario 4, featuring a column composition of 6% sand, 6% rice husk ash, and 0% cement, achieved a significant increase in bearing capacity (qult) with a value of 0.24 kg/cm2 and a high Bearing Capacity Ratio (BCR) of 116.09%. Scenario 1 was the most effective in reducing moisture content by 4% relative to the original soil moisture content, with a mixture comprising 3% sand column, 3% rice husk ash, and 6% cement. The findings suggest that applying soil columns can enhance the performance of flexible pavements.
The Time History of a Specific Area in Yogyakarta with a Subduction Earthquake Source Based on the 2002 Earthquake Map Wisnu Erlangga; Mochamad Teguh; Lalu Makrup; Jafar; Maharani Dagi Saputri
Teknisia Vol 28 No 2 (2023): 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.vol28.iss2.art3

Abstract

Indonesia is a country that is very prone to earthquake disasters. Earthquakes cause damage especially to buildings. In building planning, the usual earthquake load is the earthquake load from the spectral response. The use of earthquake loads from time history is very rarely used because of the difficulty of finding accurate data for an area. In this study, Alana Hotel and Apartment were chosen as research objects to find artificial time history. All earthquake data affecting Yogyakarta region were collected from several sources. Seismic hazard analysis in this study uses the PSHA (Probabilistic Seismic Hazard Analysis) method by calculating the main earthquake only. The selection of attenuation functions is based on the similarity of geological and tectonic conditions in Indonesia. These attenuation functions produce a seismic hazard curve and a uniform hazard spectrum response. The selection of time history data for bedrock is based on the results of the deaggregation process in the form of dominant magnitude and dominant distance from the subduction earthquake source. It is necessary to adjust the spectrum response in the time history data to fit the research location. Furthermore, earthquake waves from the bedrock are propagated to the surface. The results show that the peak time history acceleration value after surface propagation increased by 1.51 times than the time history in bedrock.
Investigation of Effective Section Reduction in Low Carbon Steel during SMAW Welding Mushthofa, Malik; Fakhri Pratama Nurfauzi; Astriana Hardawati
Teknisia Vol 28 No 2 (2023): 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.vol28.iss2.art2

Abstract

Welding, with its advantages of expedient execution and reduced weight, is a favored method for structural connections. However, it poses a significant risk, softening the steel and diminishing load-bearing capacity, underscoring the importance of accurate estimation. The need for precision is paramount, as critical infrastructure must remain operational not only during disasters but also during repair and maintenance activities. To address this challenge, this research introduces an approach to estimate the extent of capacity reduction resulting from welding, providing engineers with valuable insights for maintaining these critical systems structural integrity and functionality. The study examined low-carbon steel with various thicknesses, focusing on Heat Affected Zone (HAZ) width calculations and Abaqus simulations. Welding was performed at a speed of 1.67 cm/s with a 5 mm element increment. This research aimed to investigate the impact of welding parameters on low-carbon steel, particularly concerning HAZ measurements. A 4 mm-thick plate generated a 38.73 mm affected zone, while simulations with 5 mm to 12 mm thicknesses produced progressively narrower affected zones. Results demonstrated that steel plate thickness significantly influences the affected zone width, with thicker plates yielding narrower affected zones. The study examined low carbon steel with a 4 mm thickness, focusing on Heat Affected Zone (HAZ) width calculations and Abaqus simulations. Welding was performed at a speed of 1.67 cm/s with a 5 mm element increment. The research aimed to investigate the impact of welding parameters on low carbon steel, particularly concerning HAZ measurements. Results demonstrated that steel plate thickness significantly influences the affected zone width, with thicker plates yielding narrower affected zones. A 4 mm-thick plate generated a 38.73 mm affected zone, while simulations with 5 mm to 12 mm thicknesses produced progressively narrower affected zones.

Page 13 of 14 | Total Record : 137

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