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All Journal Jurnal Teknik Sipil dan Perencanaan Civil Engineering Journal BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Journal of Applied Sciences in Travel and Hospitality
Fitri, Siti Nurlita
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Civil Engineering, Building, Construction & Architecture Social Sciences Transportation

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Perkuatan Oprit Jembatan Kali Jubang Jalan Tol Pejangan - Brebes Timur menggunakan Geotekstil Fitri, Siti Nurlita
BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 9 No 1 (2021): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v9i1.2255

Abstract

The Kali Jubang Bridge, located on the Pejagan Toll Road, West Brebes, Indonesia, has oprit-embankment elevation of 7m. The soil structure in the area around Kali Jubang is the soft-brownish clay. Soft clay has a low bearing capacity and high compressibility. Therefore, these issues caused the occurrence of landslides, broken bridge plates, and different surface level which causes bumpy pavement and danger to road users. Hence, it is necessary to reinforce the oprit of the Kali Jubang. The design of geotexstile was conducted to improve the bearing capacity by using a geotextile with tensile strength (Tult) of 150 kN/m2. Results found that the initial embankment (Hinitial) was 8.9 m to anticipate the 1.9 m consolidation decrease . The geotextile was designed with 35 layers using a layer thickness of 0.25m, a top fold length of 1m, and an appropriate length for the width of the embankment for each layer.
Slope Reinforcement Design for Balikpapan-Samarinda Toll Road Landslide Section 28+000 To 28+100. Fitri, Siti Nurlita; Diputra, Marbono Widya
Jurnal Teknik Sipil dan Perencanaan Vol 25, No 2 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v25i2.46383

Abstract

The Balikpapan - Samarinda Toll Road is a new infrastructure project that connects two capital cities in East Borneo. Landslides occur in sections 28+000 to 28+100, necessitating the terrace design to prevent unstable conditions. As a result, a new proposed design is required to ensure safety in this area. This study aims to offer further slope reinforcement in this location to prevent landslides. This research utilizes secondary data from Standard Penetration Test (SPT) results to determine the soil properties. First, the lateral earth pressure was conducted to calculate the sheet pile and retaining wall structure. The other reinforcement is geogrid with geotextile combine. The Finite element model carried out all the overall stability with Plaxis calculation. The results show that all new proposed to generate the safety factor value 1.3. Sheet pile variations present the CCSP type W-600 with a total length reaching 17m, which offers a safety factor 1.31. The second variation is a retaining wall with a full height of 5m and combined in sheet pile design, which reaches the safety factor in the overall stability of 1.498. the internal strength of the retaining wall is divided into three categories: overturning, sliding, and bearing capacity with 1.55, 2.44, and 2.88, respectively. Meanwhile, the geogrid type described the SF 1.32 with three step slope design and spacing of 0.3m, 0,5m, and 1,0m, respectively. 
Analysis of Tetrachiral Sandwich Structures at High-Velocity Impact: Influence of the Applied Material and Projectile Core Geometry Maulana, Sultan; Prabowo, Aditya Rio; Wibowo, Wibowo; Do, Quang Thang; Muttaqie, Teguh; Muhayat, Nurul; Fitri, Siti Nurlita
Civil Engineering Journal Vol 10, No 10 (2024): October
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-10-017

Abstract

This research involved ballistic impact analysis on a tetrachiral sandwich structure in which the shapes of the circular nodes in the tetrachiral core are modified into polygonal shapes, namely a square, hexagon, and octagon. The objectives of this study were to observe the effect of a modified sandwich tetrachiral structure core, investigate the effect of the projectile geometry, and calculate the material performance of the structure. This research was conducted using numerical analysis utilizing the finite element method. The simulation methodology was validated through a benchmarking study, the results of which showed an error below 6%. The findings show that the material with the best performance was Armox 500T, at 5033 J. The most difficult projectile to withstand was conical, followed by ogive, hemispherical, and blunt. The results of the core modification on the tetrachiral sandwich structure show that the octagonal core had better energy absorption, by 2.8%, compared to the circular core. Modifying the node geometry in the tetrachiral core and then analyzing it with stress and strain contours are the novel aspects of this research. Doi: 10.28991/CEJ-2024-010-10-017 Full Text: PDF
Comprehensive Assessment for Liquefaction Vulnerability in Indonesia: Empirical and Element Simulation Approaches Fitri, Siti Nurlita; Sawada, Kazuhide
Civil Engineering Journal Vol 11, No 1 (2025): January
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-01-019

Abstract

Historical liquefaction events have occurred at many locations, such as Yogyakarta and Lombok; the most significant flow side is in Palu. The standard Indonesian liquefaction assessment is based on a simplified empirical analysis. However, these methods only occasionally yield appropriate results. Contrastingly, the limited data from the cyclic test ensured that the liquefaction ratio could only partially support the liquefaction vulnerability. This research aims to re-examine the empirical approach that combines the constitutive model using LIQCA with a cyclic triaxial test (CXT) and cyclic simple shear (CSS). The empirical method was arranged using deterministic and probabilistic approaches, and the recommendation of the peak ground acceleration (PGA) threshold was validated. The results show a strong relationship between all calculation methods and the SPT value, which differs in the liquefaction strength ratio. This output offers the PGA recommendation results, reaching a 48% overestimation from the empirical method without considering the cyclic test. This research presents the development of a combination of the empirical method with the element simulation from CXT and CSS. This offers a comprehensive overview of the Indonesian requirement standard assessment for liquefaction vulnerability analysis. Doi: 10.28991/CEJ-2025-011-01-019 Full Text: PDF
The impact of traffic congestion on freight transport efficiency in a tourism corridor: A case study of the Denpasar–Gilimanuk road Soimun, Ahmad; Sadri, Putu Diva Ariesthana; Navianti, Dynes Rizky; Fitri, Siti Nurlita
Journal of Applied Sciences in Travel and Hospitality Vol. 8 No. 2 (2025): JASTH: Journal of Applied Sciences in Travel and Hospitality
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/jasth.v8i2.177-198

Abstract

Traffic congestion has a significant impact on the efficiency of freight transportation in tourism-intensive areas such as Bali. This study analyzes the impact of congestion on the Denpasar-Gilimanuk corridor by measuring travel delays, vehicle operating costs, and increased costs due to congestion. The mixed methodology combines quantitative analysis based on the Indonesian Road Capacity Guidelines (PKJI), Vehicle Operating Cost calculation with PCI, with qualitative interviews with 25 logistics stakeholders over 6 days, in conjunction with traffic surveys. The results show that during peak hours, the volume to capacity (V/C) ratio exceeds 1.02 with freight vehicle speeds dropping below 15 km/h. The regression analysis revealed a strong inverse relationship between traffic volume and vehicle speed, resulting in increasing operating costs. Congestion costs reached IDR 2,699/km for pick-ups and IDR 30,879/km for large trucks, a 60% increase over smooth traffic conditions. Interviews confirmed that delivery delays negatively impact supply chain reliability, particularly affecting the fulfillment of tourism needs. The research quantified the tourism logistics conflict in Bali, revealing that the overlap of peak tourist hours with delivery schedules increased waiting times by 56%. Recommendations include infrastructure improvements, dedicated freight lanes, implementation of smart traffic management, and scheduling of off-peak deliveries. The findings contribute to strategic transportation planning for multifunctional corridors serving both tourism and logistics sectors. Limitations of the study include the focus on national roads only and the short duration of data collection, which may not fully capture seasonal traffic variations. Future research should extend the observation period and include secondary road networks to better understand regional freight transportation dynamics.
Co-Authors Aditya Rio Prabowo Diputra, Marbono Widya Do, Quang Thang Dynes Rizky Navianti Maulana, Sultan Muttaqie, Teguh Nurul Muhayat Sadri, Putu Diva Ariesthana Sawada, Kazuhide Soimun, Ahmad Wibowo Wibowo