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All Journal Jurnal Teknologi Jurnal Konstruksia Prosiding Semnastek International Journal of Civil Engineering and Infrastructure (IJCEI)
Trijeti
Teknik Sipil, Universitas Muhammadiyah Jakarta
Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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Analysis of Redundant Building Construction Material: A Case Study for A Hospital Building Project in Bogor Aditya Gilang Rakasiwi; Trijeti Trijeti; Rachmad Irwanto
International Journal of Civil Engineering and Infrastructure Vol 1, No 2 (2021): IJCEI Volume 1 No. 2
Publisher : University Of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (381.671 KB) | DOI: 10.24853/ijcei. 1. 2. 24-34

Abstract

Construction materials are very significant spending in a construction project. They may create losses to Implementation Budget Plan (IBP) whenever the number is excessive. This paper is intended to find causes of redundant materials for guidelines to next projects to avoid excessive number of redundant materials. This paper details driving factors to material redundancy, total value of redundant materials and percentage ratio of redundant materials total value over IBP value. To obtain those factors causing redundant materials, this research run a set of questionnaires referenced from journals and refined by expert professionals. The questionnaires set was then handed to managerial peers and other non-managerial respondents to acquire their responses. The questionnaire outcome provides clues on major driving factors. They are lack of control at site, lack of supervision and lack of allocated facility for redundant materials. Further studies in this paper using price details in IBP and unit conversion on redundant materials have come to a material redundant value of Rp. 383.940.000 from an IBP value of Rp. 31.125.169.000. The highest percentage ratio of redundant materials is from ceramics fitting works at 34.18% while total value percentage ratio of redundant materials over IBP is 1.23%.
EFFECTIVENESS OF GOVERNMENT’S ELECTRONIC PROCUREMENT OF GOODS AND SERVICES IN ITS ROLE WITHIN THE GOVERNMENT’S PROJECTS Yan Ari Wibowo; Trijeti Trijeti; Rachmad Irwanto
International Journal of Civil Engineering and Infrastructure Vol 2, No 1 (2022): IJCEI Volume 2 No. 1
Publisher : University Of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (399.434 KB) | DOI: 10.24853/ijcei. 2. 1. 57-69

Abstract

The government’s goods and services procurement are the major part in the state budget realization for its impact on performance of government’s departments. Considering the growing number of goods and services procurements, the government rules to set the procurement of goods and services electronically. This helps the government to run the state budget realization that is good in timekeeping, efficiency and accountability during procurement process. The effectiveness of electronic procurement of goods and services (e-procurement) of the government is strongly related to the government’s projects. This is presented in this study using a descriptive quantitative method on processed data output from SPSS v.23. The data was sourced from recorded government’s project in LKPP in 2019. The result shows good effectiveness level at 65,9% with supporting strong correlation value at 0,812 following consummated budget at 95,71%. Based on those statistics, this paper suggests that the run of government’s projects automatically would induce a consummated budget in which targets would be achieved and provide more benefits. Therefore, a good run of government’s projects needs better effectiveness of the government’s e-procurement of goods and services.
RISK MANAGEMENT IN THE JABODEBEK LRT (LIGHT RAIL TRANSIT) DEVEL-OPMENT PROJECT, IN JAKARTA AND ITS NEIGHBOURING CITIES Trijeti Trijeti; Andi Madeppungeng; Rachmat Said Rasul; Rachmad Irwanto
International Journal of Civil Engineering and Infrastructure Vol 2, No 1 (2022): IJCEI Volume 2 No. 1
Publisher : University Of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (450.996 KB) | DOI: 10.24853/ijcei. 2. 1. 70-87

Abstract

LRT (Light Rail Transit) is one solution for an environmentally friendly transportation system to overcome congestion problems that occur in Jakarta. This mass transportation is considered effective because there is less land in the capital for road construction. The project is a complex project that includes design, material procurement and construction. The development that is currently underway is cross-service 1 (Cawang-Cibubur), cross-service 2 (Cawang-Dukuh Atas) and cross-service 3 (Cawang-Bekasi East). This study aims to determine the risks that often arise and find out the right way to handle the risks that arise in the construction of the JABODEBEK LRT project. Data was collected using a questionnaire on 45 respondents who were involved in the construction of the JABODEBEK LRT project. The variables studied in this study are aspects of scheduling planning, aspects of scope and work documents (contracts), aspects of organizational systems, coordination and communication, aspects of resource readiness/preparation, aspects of inspection systems, work control and evaluation and other aspects (force majeure /beyond the ability of the owner and contractor). Data processing in this study used the SPSS version 25 program. This study discusses seven variables classified as high risk (H) in the project.
CAPACITY OF ADHYAKSA RESERVOIR IN NORTH JAKARTA Trijeti Trijeti; Widha Wati Liestyowening
International Journal of Civil Engineering and Infrastructure Vol 1, No 1 (2021): IJCEI Volume 1 No. 1
Publisher : University Of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (588.75 KB) | DOI: 10.24853/ijcei.1.1.23-32

Abstract

Adhyaksa reservoir is located within the Adhyaksa Public Hospital on Mabes Hankam street number 60, Ceger, Cipayung district, in the area of East Jakarta, which is one of the areas prone to flooding. Adhyaksa reservoir has a pump house available that is used to pump the excess water in the reservoir but there are still puddles in several places around the residential area. The problems occurs due to sedimentation in the canal, inadequate size of the canal, and narrowing of the canal. These causes the canal that is supposed to drain water into a reservoir to not work optimally. By conducting canal analysis using Log Pearson III method, using data obtained from 3 Rainfall Station namely, Bekasi Rainfall Station, Halim Rainfall Station, and Bogor Rainfall Station, it was found that the rainfall intensity that occured in the last 10 years cycle is 162,29 mm. Then, the Mononobe equation was used to find the intensity of rain per hour that occours. The planned rain discharge was then found using a rational method. From these calculations, it was discovered that there are 9 canals namely (5, 11, 12, 13, 17, 18, 19, 20 and 23) that are unable to accommodate the rainfall that occurs.
THE PERFORMANCE OF QUEUE LENGTH OF VEHICLE ON THE ROUNDABOUT AT SELAMAT DATANG MONUMENT USING PTV VISSIM Harwidyo Eko Prasetyo; Andika Setiawan; Trijeti Trijeti; Tanjung Rahayu; Ayu Ramadhona
International Journal of Civil Engineering and Infrastructure Vol 1, No 2 (2021): IJCEI Volume 1 No. 2
Publisher : University Of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (433.104 KB) | DOI: 10.24853/ijcei. 1. 2. 10-16

Abstract

Traffic density or congestion in DKI Jakarta is an issue that difficult to resolved. In this study, an analysis of traffic congestion was carried out by looking at the length of the vehicle queue that occurred at the roundabout. PTV VISSIM performs simulations by entering vehicle volume data and others. The program also shows the results of projections for the next 5 years to find out the impact of traffic at the roundabout. The value of traffic growth per year is 1%. In analyzing the existing conditions using PTV VISSIM, calibration and validation are necessary. On the Jl. Thamrin N-S obtained a queue length of 461.69 m. For sections on Jl. Sudirman S-N is 482.13 m. For the queue length in the existing condition, projections are made for the next 5 years. After the projection, simulation comes with 2 alternatives, road widening and underpass. Based on the projections and alternatives made, the queue length can be obtained. Based on the analysis with these projections and alternatives, the alternative underpass for the queue length on Jl. Thamrin N-S is 0.0 m long and on Jl. Sudirman S-N is 356.20 m. On the Jl. Thamrin N-S is 407.10 m and on Jl. Sudirman S-N is 444.98 m.
Prioritas Kerusakan Perkerasan Kaku Pada Jalan Raya Cikarang Sukatani Kabupaten Bekasi Al Kautsar, M. Gibran; Soerjatmodjo, Irnanda Satya; Rahayu, Tanjung; Trijeti, Trijeti
Konstruksia Vol 16, No 1 (2024): Jurnal Konstruksia Vol 16 No. 1 Tahun 2024
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jk.16.1.142-153

Abstract

Perkembangan sektor industri yang pesat membutuhkan infrastruktur jalan yang andal untuk mendukung kelancaran distribusi barang dan pertumbuhan ekonomi. Jalan Raya Cikarang Sukatani, Kabupaten Bekasi, Provinsi Jawa Barat, merupakan ruas jalan strategis yang berperan penting dalam mendukung aktivitas industri di sekitarnya. Namun, kerusakan jalan seperti retak, deformasi, dan lubang menjadi tantangan utama yang mengurangi kapasitas jalan dalam mendukung beban lalu lintas dan mempercepat kerusakan perkerasan. Penelitian ini bertujuan untuk mengevaluasi kondisi jalan menggunakan metode Pavement Condition Index (PCI) dan menetapkan prioritas perbaikan menggunakan metode Binamarga, sehingga dapat memberikan rekomendasi yang tepat dalam pengelolaan jalan. Metode PCI digunakan untuk mengukur tingkat kerusakan perkerasan dan memberikan nilai numerik sebagai indikator kondisi jalan, sedangkan metode Binamarga digunakan untuk menentukan prioritas perbaikan berdasarkan tingkat urgensi dan dampaknya terhadap pengguna jalan. Hasil penelitian menunjukkan bahwa terdapat 10 jenis kerusakan yang teridentifikasi sepanjang ruas jalan yang diteliti, dengan nilai kondisi perkerasan jalan sebesar 58,04, yang mengindikasikan kondisi perkerasan yang baik berdasarkan standar ASTM D6433-11. Selain itu, prioritas perbaikan menunjukkan perlunya program peningkatan di 8 segmen jalan yang mengalami kerusakan serius dan pemeliharaan berkala di 92 segmen lainnya.
Manajemen Lalu Lintas Pada Simpang 3 Lengan Dengan Tinjauan Tundaan Setiawan, Andika; Prasetyo, Harwidyo Eko; Muhtadi, David; Novriani, Shinta; Trijeti, Trijeti
Konstruksia Vol 16, No 1 (2024): Jurnal Konstruksia Vol 16 No. 1 Tahun 2024
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jk.16.1.119-130

Abstract

Suatu perkotaan tidak lepas dari kepadatan lalu lintas karena pergerakan manusia yang tinggi. Pada kasus simapng 3 lengan salah satunya ialah kemacetan. Untuk itu perlu dilakukan kajian pada simpang tersebut untuk mengevaluasi kinerja pada simpang. Simpang yang dikatakan mengalami kemacetan jika nilai derajat kejenuhan lebih dari 1. Hasil kondisi eksisting yang di evaluasi maka dapat dilakukan pengambilan keputusan terhadap simpang tersebut. Untuk metodologi dengan mensurvei lalu lintas yang didapatkan dengan 3 jenis kendaraan yaitu mobil penumpang, kendaraan besar dan sepeda motor. Survei dilakukan selama 3 hari untuk mendapatkan volume kendaraan perharinya. Berdasarkan hal tersebut maka dilakukan analisis lebih lanjut. Untuk analisis pertama dilakukan dengan melihat pada kondisi eksisting berdasarkan volume kendaraan yang di survei. Berdasarkan data volume kendaraan dihubungkan terhadap kapasitas. Kapasitas melihat dari rumus yang ada di MKJI. Pada tinjauan kapasitas melihat faktor-faktor diantaranya pendekat rata-rata, factor median, ukuran kota, factor hambatan samping, dan aspek lainnya. Pada analisis eksisting pada simpang 3 lengan tersebut didapat nilai derajat kejenuhan sebesar 1,1. Untuk nilai tundaan pada kondisi eksisting pada simpang 3 lengan didapat sebesar 21,81 det/smp. Dengan kondisi derajat kejenuhan yang lebih dari 1, maka perlu dilakukan manajemen lalu lintas pada simpang tersebut. Fungsi dari manajemen lalu lintas untuk menurunkan nilai derajat kejenuhan yang diharapkan saat diaplikasikan tingkat kemacetan dapat terurai. Manajemen lalu lintas yang dilakukan dengan memasang barrier pada simpang tersebut. Dengan manajemen lalu lintas berupa pemasangan barrier pada simpang tersebut didapat nilai derajat kejenuhan sebesar 0,7. Dengan pemasangan barrier didapat nilai tundaan sebesar 10,87 det/smp.
THRESHOLD-BASED ANOMALY DETECTION IN DRY BULK CARGO VOLUME USING SIMULATED LSTM AUTOENCODER RECONSTRUCTION ERROR Soerjatmodjo, Irnanda Satya; Supriyatno, Dadang; Abdat, Zidan Fadzil; Trijeti
International Journal of Civil Engineering and Infrastructure Vol. 5 No. 1 (2025): IJCEI Volume 5 No. 1
Publisher : University Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study addresses the challenge of detecting anomalies in annual dry bulk cargo volumes at a major Indonesian port by simulating the reconstruction error typically produced by an LSTM Autoencoder model. Instead of applying deep learning directly, the research utilizes a statistical approximation involving a three-year centered moving average to emulate the expected cargo pattern. The absolute deviation between actual and smoothed values is treated as simulated reconstruction error. A statistical threshold is then calculated based on the mean and standard deviation of these errors to distinguish normal years from anomalous ones. Results indicate that only the year 2023 exceeded the anomaly threshold, suggesting significant irregularity in cargo flow during that period. The proposed method offers a practical and interpretable framework for anomaly detection, particularly in data environments lacking access to machine learning infrastructure. This approach enables port operators and planners to monitor unusual volume fluctuations efficiently and provides a foundation for further integration of data-driven risk management systems. Keywords: Dry Bulk Cargo, Anomaly Detection, Reconstruction Error, LSTM Autoencoder, Moving Average, Threshold Classification, Port Operations.
Co-Authors Abdat, Zidan Fadzil Abdul Muis ABDUL MUIS Aditya Gilang Rakasiwi Aji Komarudin Al Kautsar, M. Gibran Andi Maddeppungeng Andi Madeppungeng Andika Setiawan Asmar Diansyah Ayu Ramadhona Bagus Budi Setiawan Bambang Hernawan Bambang Hernawan Dadang Supriyatno Erlan Saputra Erlan Saputra Hari Jamato Harwidyo Eko Prasetyo Haryo Koco Buwono Kiki Rizki Rinjani Putri Lily Mauliani Muhamad Aswanto Muhamad Aswanto Muhtadi, David Novia Ragil Setiawan Novriani, Shinta Priyo Hartono Priyo Hartono Rachmad Irwanto Rachmat Said Rasul Revmen Revmen Revmen Revmen, Revmen Sevina Yasti Putri Soerjatmodjo, Irnanda Satya Tanjung Rahayu Tanjung Rahayu Widha Wati Liestyowening Wiwik Sudarwati Yan Ari Wibowo Yulistianingsih Yulistianingsih