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A Analysis of Time and Cost Optimization in Building Contruction Using Time Cost Trade Off Method Firyaal Nabila
Journal of Civil Engineering and Planning (JCEP) Vol. 4 No. 2 (2023)
Publisher : Program Studi Sarjana Teknik Sipil Universitas Internasional Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37253/jcep.v4i2.8662

The construction of both buildings and roads has several success factors. One of the influencing factors is the timely completion of the project and the costs incurred in accordance with the Budget Plan (RAB) that was prepared during planning. Many projects experience problems with delays in completion time, if the project is completed late then they will be subject to fines. So it is necessary to carry out appropriate calculations so that construction implementation can proceed based on the initial planning. For this reason, this research was carried out by analyzing time and cost optimization using one method, namely Time Cost Trade Off, by calculating the fastest implementation time and the minimum costs incurred. The results obtained from this research are that, by increasing the working hours by 1 hour, the project duration is reduced to 106 days and the cost decreases to Rp. 2,722,750,086, 05. Meanwhile, if workers are added equivalent to an additional 1 hour of working hours, the project duration is reduced to 106 days and costs also decrease to Rp. 2,720,684,806.69. For additional working hours of 3 hours, the project duration becomes 59 days and the cost becomes Rp. 2,552,212,214, 71. Meanwhile, if you add workers equivalent to adding 3 hours of work, the project duration will be 59 days, but the cost will decrease to Rp. 2,545,208,046.33. It can be concluded from this research that by speeding up the project completion time, total costs will decrease and it is most efficient to increase labor rather than increase working hours (overtime). This is done so that the project does not experience delays and incur fines.

Pemanfaatan Bambu pada Hand Railing di Akses Wisata Curug Leuwi Jatatan Suzanti, Wiwien; Maddeppungeng, Andi; Ujianto, Rifky; Damanik, Mariana Feronica; Nabila, Firyaal; Nofiana, Tiara; Kurniawan, Feri
Civil Engineering for Community Development (CECD) Vol 3, No 2 (2024): Edisi Oktober 2024
Publisher : Department of Civil Engineering Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/cecd.v3i2.29048

Desa Bantarwangi merupakan desa disemenanjung Kabupaten Serang. Desa Bantarwangi memiliki luas wilayah sebesar 3099 ha desa di semenanjung Kabupaten Serang letaknya yang berdekatan dengan laut menjadi daya ikat masyarakat luas untuk melakukan kegiatan berlibur maupun rekreasi. Curug Leuwi Jatatan yang berada di Desa Bantarwangi tepatnya di Kampung Calung yang juga merupakan sumber kegiatan cuci kakus bagi warga Desa Bantarwangi. Potensi Desa yang kaya akan kawasan wisata sudah seharusnya diperhatikan oleh pemerintah maupun masyarakat terutama pada akses jalan dan fasilitasnya. Penting diperhatikan dalam hal ini adalah akses menuju Kawasan Curug Leuwi Jatatan dimana akses jalan yang terjal dan curam menjadi perhatian bagi civitas akademik. Berkolaborasi dengan mahasiswa Universitas Bina Bangsa berkontrubusi untuk masyarakat Desa Bantarwangi dengan membangun Hand Railing atau pagar tangan yang berbahan dasar bambu sebagai penunjang keselamatan pengunjung Curug Leuwi Jatatan menjadi tujuan pengabdian kepada masyarakat. Dengan menggunakan metode Plugin/ Bolt Connection yang merupakan sambungan batang yang saling bersilangan diharap pemanfaatan bambu ini dapat dirasakan oleh masyarakat maupun pengunjung. Semoga dengan adanya karya dari civitas akademik ini dapat bermanfaat dan menjadi bentuk karya yang alami dari alam untuk alam serta dirasakan oleh masyarakat maupun pengunjung Curug Leuwi Jatatan.

MODELING OF WATER SEEPAGE AT SINDANG HEULA DAM Kusumaningrum, Winda; Purnaditya, Ngakan Putu; Fathonah, Woelandari; Priyambodho, Bambang Adhi; Subekti, Subekti; Nabila, Firyaal
Jurnal Fondasi Vol 13, No 2 (2024)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fondasi.v13i2.29289

A embankment dam is a dam built by stockpiling materials such as stones, gravel, sand, and soil on a certain composition with the function of carrying or lifting the water surface contained in the reservoir [1]. One of the structural safety of a embankment dam is against water seepage. Water seepage that occurs on the slope body during flooding can affect the decrease in slope stability, where the seepage will cause piping symptoms [2]. This study aims to determine the seepage discharge value that occurs in the dam body. The object of this study was Sindang Heula embankment dam in Banten Province. The method used is to conduct an analysis using GeoStudio software with the SEEP/W feature for seepage discharge. Simulation run in two scenarios as steady state condition and transient. Both scenario also run at least on three reservoir water level conditions. They are water level during flood, normal water level and half of full water level. Steady state condition gave seepage flux about 3.773×10-6 m3/sec/m2 as maximum value. In another hand, 30 days transient simulation gave maximum value about 8.7188×10-4 m3/sec/m2 and it occurred in small reference time after initial run. This study infomed that SEEP/W has capability to simulate water flux through porous media of embankment dam.

Evaluasi Data Hujan Menggunakan Metode Validasi dan Kalibrasi: Studi Kasus pada Daerah Aliran Sungai Opak Firyaal Nabila; Subekti Subekti; Ngakan Putu Purnaditya; Bambang Adhi Priyambodho; Restu Wigati; Dewandha Mas Agatya
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 2 (2025): Agustus : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i2.6019

Flooding is one of the natural disasters that can occur in various parts of the world and may arise suddenly. However, flood events can be predicted or anticipated through relevant scientific approaches. One such method is by estimating the flood discharge in a given area. Rainfall data is one of the essential inputs required to determine flood discharge. In practice, however, ground-based rainfall measurements often have limitations. To overcome these shortcomings, satellite-based rainfall data can be utilized. There are notable differences between directly measured rainfall data and satellite-derived rainfall data; therefore, satellite data must be calibrated or validated prior to conducting further analysis. One of the most widely used satellite rainfall datasets is the GPM (Global Precipitation Measurement) satellite data, which has a spatial resolution of 0.1° x 0.1°. This study employs a combination of two statistical methods—validation and calibration—to evaluate rainfall data. Prior to evaluation, the RMSE and NSE values did not meet acceptable standards, and the correlation value was low. However, after the evaluation using both methods, improvements were observed: RMSE and NSE values became acceptable, and the correlation increased. These results indicate that the applied methods are effective for evaluating rainfall data. For future research, monthly or annual rainfall data can be utilized to further explore the relationship between different temporal scales of rainfall observations.

Flood Analysis of the Kedung Ingas River and Pabean River the Cilegon City Waita, Stanley Reynaldi Frits Sirway; Priyambodho, Bambang Adhi; Purnaditya, Ngakan Putu; Fathonah, Woelandari; Subekti, Subekti; Nabila, Firyaal
Jurnal Fondasi Vol 14, No 1 (2025)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v14i1.32284

The Kedung Ingas River and Pabean River the Cilegon City often flood every year. It has an impact on losses and disruptions to public facilities and settlements such as highways, Cilegon Regional Hospital, Metro housing and residential areas located close to the river. The purpose of this study is to determine the amount of design discharge at 10, 25 and 50 years return period. The methods used to calculate the design flood discharge are Rational, Der Weduwen, and HSS Nakayasu. Based on the results of the study, the design flood discharge of the Kedung Ingas River and the Pabean River with Q10 = 121.25 m3/s, Q25 = 131.01 m3/s, and Q50 = 138.79 m3/s. The design flood discharge value used is the calculation value using the selected method, namely Nakayasu Synthetic Unit Hydrograph.

Modeling of Water Seepage at Sindang Heula Dam Kusumaningrum, Winda; Purnaditya, Ngakan Putu; Fathonah, Woelandari; Priyambodho, Bambang Adhi; Subekti, Subekti; Nabila, Firyaal
Jurnal Fondasi Vol 13, No 2 (2024)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v13i2.32721

A embankment dam is a dam built by stockpiling materials such as stones, gravel, sand, and soil on a certain composition with the function of carrying or lifting the water surface contained in the reservoir [1]. One of the structural safety of a embankment dam is against water seepage. Water seepage that occurs on the slope body during flooding can affect the decrease in slope stability, where the seepage will cause piping symptoms [2]. This study aims to determine the seepage discharge value that occurs in the dam body. The object of this study was Sindang Heula embankment dam in Banten Province. The method used is to conduct an analysis using GeoStudio software with the SEEP/W feature for seepage discharge. Simulation run in two scenarios as steady state condition and transient. Both scenario also run at least on three reservoir water level conditions. They are water level during flood, normal water level and half of full water level. Steady state condition gave seepage flux about 3.773×10-6 m3/sec/m2 as maximum value. In another hand, 30 days transient simulation gave maximum value about 8.7188×10-4 m3/sec/m2 and it occurred in small reference time after initial run. This study infomed that SEEP/W has capability to simulate water flux through porous media of embankment dam.

Effect of Discharge Variations on Flow Characteristics in Chute Syabrina Arvadelia; Firyaal Nabila; Bayu Krisna Wisnulingga; Ngakan Putu Purnaditya; Bambang Adhi Priyambodho; Subekti Subekti
Jurnal Fondasi Vol 15, No 1 (2026)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v15i1.39612

The utilization of water resources in open channel systems is critical to support drainage efficiency and surface flow control, especially in areas with steep topographic conditions. Chute are used to overcome flows with large base slopes so that channels can be designed with sub-critical bottom slopes and do not cause erosion. This study aims to analyze the effect of discharge variations on the characteristics of flow and hydraulic jump on chute. The research method uses a physical model using flume conducted at the Integrated Laboratory of Sultan Ageng Tirtayasa University. Based on the results of the study, it was shown that the increase in flow discharge at the constant slope (1:1) and the difference in the constant height of the chute (0.2 m) resulted in an increase in water level elevation and an increase in velocity upstream, retreat and downstream. The type of flow that occurs upstream is an almost critical flow (Fr = 1), while the type of flow in the upstream and downstream is a supercritical flow (Fr > 1). The hydraulic jump length and hydraulic jump height have increased due to the increase in flow discharge. The flow velocity and froude numbers from upstream to upstream have increased, while the flow velocity and froude numbers from downstream have decreased.

Dam Break Simulation of Sindangheula Dam Using HEC-RAS 2D Angel Laurent Aldamike Dipra Sintia; Firyaal Nabila; Subekti Subekti; Bambang Adhi Priyambodho; Ngakan Putu Purnaditya; Bayu Krisna Wisnulingga
Jurnal Fondasi Vol 15, No 1 (2026)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v15i1.39450

Dams serve various utilities but inherently carry significant risks, particularly the potential for dam failure, which can lead to catastrophic flooding due to the sudden release of high-velocity flows toward downstream areas. While dam break simulations have been widely studied, no prior research has specifically analyzed the Sindangheula Dam using the HEC-RAS model. This study aims to simulate dam failure to determine the design flood discharges for Q1000 and QPMF, the resulting hydrographs following the dam break, and the extent of flood inundation. The design flood hydrographs in this simulation were generated using the Snyder method and modeled through the HEC-HMS software. The dam break analysis for Sindangheula Dam was conducted using a fully 2D model in HEC-RAS, incorporating both overtopping and piping failure scenarios Froehlich 2008. The hydrologic analysis yielded a Q1000 discharge of 498,27 m³/s and a QPMF discharge of 701,88 m³/s. The overtopping scenario produced the most severe impacts, with peak hydrographs reaching 5168,57 m³/s for Q1000 and 5267,21 m³/s for QPMF. Flood depths reached up to 18,27 m with an inundation area of 66,62 km² under Q1000, and up to 18,22 m with 70,44 km² under QPMF, submerging downstream regions including Taktakan, Serang, Cipocok, Kasemen, and Pontang.

EDUKASI PENYUSUNAN DOKUMEN PRA STUDI KELAYAKAN OLEH MAHASISWA PADA RENCANA JALAN TOL SERANG – PANIMBANG, PROVINSI BANTEN Muhammad Fakhruriza Pradana; Rindu Twidi Bethary; Arief Budiman; Siti Asyiah; Dwi Novi Setiawati; Firyaal Nabila; Andira Pramudita; Malika Laisah Akhirudin; Muhamad Hikmal Kahfi; Muhammad Rakha Revaldo; Muhammad Ulul Azmi; Saila Nur Awlannisa; Widia Febriyanti; Lovely Lady
Civil Engineering for Community Development (CECD) Vol 5, No 1 (2026): Edisi April 2026
Publisher : Department of Civil Engineering Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/cecd.v5i1.39382

Pembangunan Jalan Tol Serang–Panimbang ditujukan untuk meningkatkan aksesibilitas kawasan selatan Provinsi Banten yang memiliki potensi pariwisata dan ekonomi tinggi, namun masih terkendala oleh waktu tempuh yang panjang serta keterbatasan kapasitas jaringan jalan eksisting. Penelitian ini bertujuan melakukan pra-studi kelayakan pembangunan jalan bebas hambatan Serang–Panimbang melalui kajian terintegrasi aspek teknis, transportasi, geoteknik, perkerasan, serta ekonomi dan finansial sebagai dasar penentuan kelayakan proyek. Metodologi yang digunakan meliputi pengumpulan data primer berupa survei lalu lintas (traffic counting), survei kecepatan perjalanan, survei topografi, serta pengujian geoteknik menggunakan Dynamic Cone Penetrometer (DCP) dan CBR, serta data sekunder dari instansi terkait. Analisis dilakukan berdasarkan ketentuan PKJI 2023, pedoman Bina Marga, dan standar perencanaan teknis jalan. Hasil kajian menunjukkan bahwa proyeksi volume lalu lintas, termasuk diverted traffic dan induced traffic, mendukung kebutuhan pembangunan jalan bebas hambatan. Perencanaan geometrik dan evaluasi geoteknik menunjukkan trase memenuhi persyaratan keselamatan dan kelayakan konstruksi, sedangkan struktur perkerasan kaku tipe Jointed Plain Concrete Pavement (JPCP) dinilai sesuai dengan beban lalu lintas rencana dan kondisi tanah dasar. Analisis ekonomi-finansial menunjukkan manfaat signifikan berupa efisiensi waktu perjalanan, penurunan biaya operasional kendaraan, peningkatan akses kawasan wisata Tanjung Lesung, serta dampak positif terhadap pertumbuhan wilayah. Secara keseluruhan, pembangunan Jalan Tol Serang–Panimbang dinilai layak untuk dilanjutkan ke tahap perencanaan teknis detail.

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