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Roni Farfian
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pencegahan Keruntuhan Progresif pada Struktur Jembatan Tinjomoyo dari Analisis Hidrologi dan Geoteknik Udayanto, Nugroho Sungkono; Agus Sulaeman; Roni Farfian
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 23 No 2 (2024): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55893/jt.vol23no2.501

Abstract

This study aims to analyze measures to prevent progressive collapse of the Tinjomoyo Bridge in Semarang through hydrological and geotechnical approaches. The research employs a quantitative method with a descriptive approach to evaluate issues encountered in the field. The study includes an analysis of the impact of adding crib structures on riverbank slopes to mitigate scouring caused by water flow and redesigning the bridge pier foundation structure based on soil investigation data and loading conditions. Hydrological analysis indicates that a downstream weir slope of 20% effectively directs water flow to prevent damage to the slopes and bridge piers. Simulations using Plaxis 8.2 reveal that adding crib structures to the riverbank reduces longitudinal displacement by 269.07 mm. Furthermore, the structural safety factor increases from 10.774 (initial condition) to 12.024 (engineered condition). From a geotechnical perspective, redesigning the pier foundation using bored piles with a diameter of 1 meter and 12 pile groups effectively supports the applied loads. Based on the analysis, the proposed crib and foundation design are recommended as solutions to prevent progressive collapse of the Tinjomoyo Bridge. This solution is expected to provide long-term safety and stability for the bridge structure.
Kajian Optimasi Kapasitas Danau Tempe untuk Mengurangi Banjir di Kabupaten Sidrap, Kabupaten Soppeng, dan Kabupaten Wajo - Provinsi Sulawesi Selatan Agustin Purwanti; Roni Farfian; Chairunnisa; Rifaldi Aji Sarifudin; Aditya Wisnu M.P
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 21 No 1 (2022): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55893/jt.vol21no1.431

Abstract

Tempe Lake is a floodplain lake in South Sulawesi Province. The capacity of Tempe Lake is affected by the inflow into the lake. The high intensity of rain causes the lake water to overflow and flood the area around the lake. To reduce the flood inundation, an optimization study was carried out on the capacity of Tempe Lake. Optimization is carried out by adjusting the optimal height of the gate opening on the Tempe Moveable Weir using a hydrological model. The curve number (CN) of rivers flowing into the lake is used, which is a function of 2 land cover scenarios, namely the existing condition and the RTRW plan for South Sulawesi Province. Based on hydrological modeling, it was found that the inflow of Tempe Lake (Q25) for the existing condition scenario was 11,825.83 m3/s, and for the RTRW plan of South Sulawesi Province, scenario was 11,606.62 m3/s. The 2D hydrodynamic modeling simulates various heights of gate openings on the Tempe Moveable Weir with respect to the flood inundation area. The optimal capacity of Tempe Lake to reduce flooding is achieved by maintaining the water level at +7.53 m above sea level with a gate opening height of 4 m.
Co-Authors Aditya Wisnu M.P Agus Sulaeman Agustin Purwanti Chairunnisa Rifaldi Aji Sarifudin Udayanto, Nugroho Sungkono