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All Journal Jurnal Komposit : Jurnal Ilmu-Ilmu Teknik Sipil Journal of the Civil Engineering Forum
Laksmi, Anasya Arsita
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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Effect of Micro-Pile Mitigation on Seismic Performance of Liquefiable Ground Asokawati, Fajrina Citra; Fansuri, Muhammad Hamzah; Chang, Muhsiung; Lin, Hseu-Jen; Purwanti, Nina; Putra, Okri Asfino; Saputra, Pungky Dharma; Laksmi, Anasya Arsita
Journal of the Civil Engineering Forum Vol. 10 No. 1 (January 2024)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.6231

Abstract

Soil liquefaction and its associated ground failures, pose a significant threat, causing damage to engineering structures during earthquakes, and one of the most effective methods used to mitigate liquefaction in liquefied soil is micro-pile (MP) method. Therefore, this study aims to examine the current state of MP method as liquefaction countermeasure in the soil of the Coal Fired Power Station in Central Java, an area with a high liquefaction potential. A three-dimensional finite element analysis, conducted with OpenseesPL software, uses a numerical method to yield information about ground lateral deformation and excess pore pressure generation caused by MP method during seismic shaking. This result examines important design parameters, including diameter, spacing, length of MP, and inclination of ground, to address these issues. MP method increases the stiffness of soil, reducing excessive pore pressure and thereby minimizing liquefaction risks. In general, MP remediation appeared effective for any sloping ground. This study provides valuable information for devising an efficient remediation solution by comparing relevant variables, such as diameter, spacing, MP length, and ground inclination, under the same conditions. Numerical simulation with OpenseesPL yields results such as stress and strain path, acceleration time histories, excess pore pressure, displacement time histories, and maximum lateral displacement, which are then compared with various diameter parameters. The diY6-ameter parameters were compared to test how the additional diameter dimension affects the performance of the micropile provided to the soil. This will be demonstrated based on the results shown on excess pore pressure and maximum lateral displacement. This comparison shows that increasing MP diameter is more effective in reducing the risk of liquefaction.
Analisis Karakteristik Pasang-Surut Menggunakan Metode Kuadrat Terkecil (Studi Kasus: Dermaga Sunda, Pondok Dayung, Jakarta Utara) Adriansyah, Abdul Hadi; Laksmi, Anasya Arsita; Christy, Abigail; Sitorus, Andreas Robert Panogu; Kampai, Arya Maulana; Putra, Dewa Ramadhan Astama; Fauzah, Dewi
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 8 No. 2 (2024)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v8i2.16021

Abstract

Indonesia is an archipelago state with 17.504 islands and an ocean area is 3,2 million square kilometers. Indonesia has challenges in maintaining maritime defense around its archipelago. Naval bases not only act as command and control centers for sea defense operations but also as providers of berthing facilities for Indonesian Warships (KRI). Navy base operations depend on oceanographic conditions, including tides. This research aims to analyze the tidal characteristics, in the form of harmonic components, tidal types, and tidal forecasting. In the analysis, the least squares method is used which provides high accuracy and precision to the research output. The results showed a Formzahl number 4,997; that the waters at Pondok Dayung have a diurnal tidal type, with the phenomenon of one high tide and one low tide in one day. The mean sea level is 60,07 cm with a tidal ridge is 127,20 cm, where the highest level is 121,96 cm and the lowest level is -5,24 cm.
Studi Perbandingan Hidrograf Satuan Sintetik pada Daerah Aliran Sungai Ciherang Rahman, Fatchur; Nurudin, Fuad Ardian; Laksmi, Anasya Arsita
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 1 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i1.17650

Abstract

This study focuses on the hydrological analysis of the Ciherang Watershed using four Synthetic Unit Hydrograph (SUH) methods: Snyder-Alexeyev, Nakayasu, ITB-1, and ITB-2. Each method was applied to determine their effectiveness in predicting flood hydrographs based on the watershed's physical characteristics and rainfall data from 2013 to 2023. The results indicate that the Snyder-Alexeyev method produced a rise time of 4.43 hours, a recession time of 20.17 hours, and a peak discharge of 1.627 m³/s. The Nakayasu method, with the fastest rise time of 2.049 hours and a recession time of 20.49 hours, generated the highest peak discharge at 2.523 m³/s. The ITB-1 method showed a rise time of 2.951 hours, a recession time of 29.512 hours, and a peak discharge of 1.895 m³/s. The ITB-2 method resulted in a rise time of 2.049 hours, a recession time of 20.49 hours, and a peak discharge of 1.891 m³/s. Among the methods, Nakayasu and ITB-2 demonstrated the quickest response, with Nakayasu yielding the highest peak discharge. These findings provide essential insights for flood management and infrastructure planning in the Ciherang Watershed and similar regions.
Analisis Rencana Anggaran Biaya Pembangunan Pos Jaga Militer di Perbatasan Indonesia-Papua Nugini Suprayogi, Suprayogi; Sitorus, Andreas Robert Panogu; Sihombing, Gian Felix; Daffarel, Rakyan Choiruna; Safaraz, Mohammad Bhampy Nugraha; Iswanto, Dian Sasmita; Pelu, Muhammad Rijali Sukur; Angelia, Ervina Wiedyasta; Laksmi, Anasya Arsita
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.17397

Abstract

This research aims to determine the costs required to build a guard post building in the border area of Papua, Indonesia and Papua New Guinea. It is hoped that this research will contribute to improving the national defense, especially regarding the construction of guard posts in national border areas. This research discusses the construction of the guard post by describing the volume of work and the planned cost budget, and the data collection methods used are primary and secondary data. In this research, guard post drawings were planned according to the standards of the Indonesian Army and supporting data in the form of Unit Prices for Goods and Services (SHBJ) in the Papua region, as well as the Ministry of PUPR's Unit Price Analysis Guidelines. Apart from that, the type of work along with the volume of work is arranged followed by an analysis of the unit price of each job. Then the Cost Budget Plan (RAB) is calculated to get the total price for each job. Thus, the total cost required to build a guard post building on the Papua border is IDR 119,441,000.00. In the future, it is hoped that this research can become a reference for building guard posts around the Papua border area.
Co-Authors Adriansyah, Abdul Hadi Angelia, Ervina Wiedyasta Asokawati, Fajrina Citra Chang, Muhsiung Christy, Abigail Daffarel, Rakyan Choiruna Fauzah, Dewi Iswanto, Dian Sasmita Kampai, Arya Maulana Lin, Hseu-Jen Muhammad Hamzah Fansuri, Muhammad Hamzah Nurudin, Fuad Ardian Pelu, Muhammad Rijali Sukur Purwanti, Nina Putra, Dewa Ramadhan Astama Putra, Okri Asfino Rahman, Fatchur Safaraz, Mohammad Bhampy Nugraha Saputra, Pungky Dharma Sihombing, Gian Felix Sitorus, Andreas Robert Panogu Suprayogi Suprayogi