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All Journal Rekayasa Sipil Prosiding Semnastek Jurnal Teknik Sipil Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Teras Jurnal Astonjadro Makara Journal of Technology Indonesian Geotechnical Journal Jurnal Geosaintek
Prakoso, Widjojo Adi
Universitas Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Transportation

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Benchmark for Country-Level Earthquake Strong-Motion Instrumentation Program Prakoso, Widjojo Adi; Sukanta, I Nyoman
Makara Journal of Technology Vol. 16, No. 2
Publisher : UI Scholars Hub

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Abstract

An empirical study to develop benchmark models at country-level to assess the suggested number of earthquake strongmotion stations based on a framework encompassing geographic, demographic, and socio-economic parameters is reported. The models are to provide a working estimate of the required number of stations for improving the strongmotion instrumentation program of Indonesia. National earthquake strong-motion networks of New Zealand, Japan, Taiwan, Iran, Turkey, and Italy were used as the references. The parameter proposed is the number of stations in land area of 1,000 km2, and three models based on the exponential regression analysis are presented as functions of population density, Gross Domestic Product (GDP) per capita, and the Global Competitiveness Index (GCI) Basic Requirements Index. Using the models, it is suggested that Indonesia would require at least 750 stations.
Experimental and Numerical Analysis of Spun Pile-to-Pile Cap Connection with Reinforced Concrete Infill under Cyclic Loading Alfetra Henoch Tandita; Yuskar Lase; Widjojo Adi Prakoso; Mulia Orientilize
Rekayasa Sipil Vol. 16 No. 3 (2022): Rekayasa Sipil Vol.16. No.3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2022.016.03.8

Abstract

Numerical study was conducted by using ABAQUS software to investigate two issues on spun pile connections. The issues are usage of non-shrinkage concrete infill cast inside hollow of pile and ductility. An experimental test was carried out to investigate the effect of two different concrete infill types which were common concrete fc’ 35 MPa and non-shrinkage concrete fc’ 54 MPa. A finite element model was validated against experimental test. The results were compared in terms of hysteresis curve, ductility, and performance level. Ductility is one of the important parameters to describe performance of spun pile connections under seismic load. There are different approaches to calculate ductility and this leads to four different ductility values. Hence, ductility of spun pile with concrete infill is in the range of 3.2 to 4.8. Behavior of spun pile with non-shrinkage concrete infill is slightly improved although the results were almost similar.
Modelling Study of Pile Group Foundation by Including Lateral Load in Clay Soil Muhammad Reza Imansyah; Widjojo Adi Prakoso; Mulia Orientilize
Indonesian Geotechnical Journal Vol. 2 No. 1 (2023): Vol.2 , No.1, April 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i1.22

Abstract

 Indonesia’s geographical condition causes earthquakes to occur more frequently. This study aims to investigate pile group response under earthquake loading by performing pushover analysis. Since clay soil is dominant and widespread in Indonesia, the study focused on pile group embedded in single layer of clay. The undrained shear strength (Su) parameters of the clay are varied from 20 kPa, to 100 kPa with 20 kPa intervals. The pile and soil were modelled by Beam-on-Nonlinear-Winkler-Foundation (BNWF), and the soil was presented as a series of Winkler springs using the nonlinear p-y method. The analysis was conducted with a finite element method (FEM) software, OpenSees. The pile was modelled as a fiber section, where the transversal and longitudinal reinforcement can be considered. The research found that the soil’s Su affects the ductility and formation of plastic hinge. Greater Su resulted in higher ductility and occurrence of plastic hinge. Higher Su was also found to increase the internal force experienced in the pile, as well as lead to higher group efficiency factor. There was no shear failure detected in the results, but bending failure happened at the lead pile in Su 100 kPa. The overturning moment phenomenon occurred on the pile group in Su 20 kPa and 100 kPa. For Su = 20 kPa, this phenomenon is caused by the middle pile and rear pile, which did not have optimal performance. Bending failure at the lead pile led to the phenomenonin Su 100 kPa.
ANALISA STATISTIK HASIL UJI KAPASITAS METODE DINAMIS (PDA TEST) PADA PONDASI TIANG PANCANG SISTEM PANCANG TEKAN Haryadi, Didik; Prakoso, Widjojo Adi
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol. 28 No. 1 (2023): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v28i1.4558

Abstract

The use of HSPD (Hydraulic Static Pile Driver) in deep foundation can reduce the level of noise and vibration as a result of pile driving. When a pile is hydraulically driven into the ground to the required axial compression capacity as recorded by a manometer installed on the HSPD equipment, a failure in this capacity is frequently observed after a dynamic verification test (PDA test). The purpose of this study is to determine the root cause of discrepancies in the axial compression capacity between results monitored by the HSPD equipment and dynamic test verification. This research examined SQ25 and SQ30 piles of 295 and 94 numbers respectively in the period of January 2020 to July 2022. Dynamic verification test indicated that 11% SQ25 and 7% SQ30 piles were problematic. Based on the linear regression analysis, the embedment of pile (Lp), final settlement (DFN), and frictional resistance (Rs) contribute an effect on the mentioned above discrepancy. For the problematic SQ25 and SQ30 piles, values of Ì…Ì…Ì… and Ì…Ì…Ì…Ì… Ì…Ì…Ì… are less than the ones for non-problematic piles. In contrary, the value of Ì…Ì…Ì…Ì…Ì…Ì… for problematic piles is larger than the one for non-problematic piles.
Back Analysis of Static Lateral Loading Tests of Pile Foundations in Soft Soils Miranti, Miranti; Prakoso, Widjojo Adi
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.15650

Abstract

Pile foundations are used to support structures. In addition to bearing the pile's load, the design's foundation structure must withstand lateral loads. As a result of the pile being exposed to lateral loads, it causes deflection or displacement of the pile. One method of testing foundation capacity is the static lateral loading test. The result of this test is the lateral deflection of the pile, with a certain load given to the pile head due to cyclic loads. The lateral loading test data in the study was tested on seven piles with a diameter of 600 m at the Kapuk Banten project site. The soil investigation results found that the dominance of soft clay soil is quite thick. This research aims to back-analyze the results of static lateral loading tests using LPile 2019 software as a model evaluation in soft soil geotechnical conditions. The back analysis obtained soil parameters that produced deflections close to the results of static lateral loading tests.
Numerical Analysis of the Response of Existing Tunnel Structures to Crossing Tunnel Construction in Soft Soil Yanreginata, Muhammad Amhar Wajdi; Prakoso, Widjojo Adi
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.15858

Abstract

Massive urban planning forces the utilization of underground space, not least in the development of transportation infrastructure. MRT Jakarta has successfully made its line in phase 1 Lebak Bulus - Bundaran HI and now is developing the line which is packaged in phase 2 to the direction of Ancol, this route reaches the south-north part of Jakarta. In recent years, there has also been a plan to add an East-West line which will be packed in phase 3, this does not rule out the possibility of a meeting between the existing tunnel and the undercrossing tunnel. This study discusses the influence of undercrossing on the existing tunnel structures, especially under Jakarta Clay, which is classified as having a thick, soft clay stratum. This research was divided into 2 steps using finite element analysis with Hardening Soil model. The first step is to conduct a back analysis to obtain the actual soil parameter value then proceed with step 2, which is to conduct an undercrossing twin tunnel analysis. Based on the results of the study showed the fittest soil parameters using the correlation E50 = 3500N by the effective soil strength parameters and the undercrossing excavation caused four stages of vertical displacement of the existing tunnel.
Evaluasi Spektrum Respons Amplifikasi Gerak Tanah Gempa Studi Kasus Kampus Universitas Indonesia, Depok Lucky Suryajaya, Lingga Ekaputra; Prakoso, Widjojo Adi
Prosiding Semnastek PROSIDING SEMNASTEK 2024
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Penelitian evaluasi spektrum respons amplifikasi gerak tanah gempa dilakukan di HutanUI, Depok. Penelitian ini merupakan tindak lanjut dari studi sebelumya yang mempelajariamplifikasi gerak tanah gempa dari kedalaman 300 meter hingga permukaan tanah.Evaluasi dilakukan secara satu dimensi (1D) menggunakan perangkat lunak DEEPSOILv7dengan metode studi parametrik terhadap aspek kekakuan tanah dan ketelitian pemodelan,yaitu: ekstrapolasi linear N-SPT, penyesuaian vs dari kedalalman 80 meter – 300 meter,penyesuaian vs dari permukaan tanah, penyesuaian model konstitutif tanah, danpenyesuaian fmax. Dari evaluasi yang dilakukan, diperoleh best model spektrum responsyang paling mendekati hasil rekaman di lapangan adalah dengan mengekstrapolasi N-SPT,menggunakan nilai vs sebesar 2.000 m/s dari kedalaman 80 meter – 300 meter,penyesuaian vs dikalikan dengan 1,5 dari permukaan tanah hingga lapisan ke-6 atau 23,5meter, serta menggunakan nilai fmax tertinggi, yaitu 300 Hz. Dari penelitian ini, diketahuipula bahwa studi sebelumya memodelkan tanah secara lebih lunak dan pengaturan fmaxsebesar 30 Hz dianggap masih kurang teliti.Kata kunci: amplifikasi, kekakuan tanah, spektrum respons, studi parametrik
Analisis Pengaruh Jumlah Tiang Fondasi Terhadap Distribusi Gaya Akibat Pembebanan Lateral Eksentris Menggunakan OpenSees Wilmer, Reynaldo Nathaniel; Prakoso, Widjojo Adi
Prosiding Semnastek PROSIDING SEMNASTEK 2024
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Perancangan fondasi sebuah infrastruktur akan mempertimbangkan beban rencana yang akan terjadi. Dalam infrastruktur jembatan, beban dapat terjadi baik secara sentris maupun eksentris. Kedua jenis pembebanan tersebut akan mempengaruhi proses distribusi gaya pada sistem fondasi. Pada jembatan yang membentang diantarai sungai, beban yang ditimbulkan dari ombak, angin, maupun beban tidak disengaja seperti tertabrak kapal dapat terjadi secara eksentrik. Sering kali beban eksentris akan menimbulkan reaksi yang sulit diantisipasi dikarenakan banyak faktor yang tidak dapat diprediksi. Untuk memberikan pemahaman akan reaksi fondasi terhadap beban eksentris, dilakukan pemodelan secara numerik menggunakan Opensees dengan memodelkan pembebanan lateral pada badan tiang sebuah elevated pile cap. Acuan dari penelitian ini merupakan fondasi Jembatan Pedamaran II di Riau, yang membentang di antara Sungai Rokan, yang menggunakan tipe fondasi tiang spun pile dengan bracing diagonal. Dilakukan pemodelan sederhana untuk konfigurasi tiang 2x2 dan 2x3. Tujuan dari penelitian adalah untuk menganalisis pembebanan eksentris pada fondasi tiang dengan bracing dan mengetahui dampak dari penambahan jumlah tiang terhadap proses distribusi gaya. Dilakukan analisis pushover pada badan salah satu tiang. Letak beban yang eksentrik ini akan menimbulkan gaya baik pada sumbu x dan y. Digunakan analisis finite element menggunakan software OpenSees. Hasil menunjukkan bahwa semakin besar eksentrisitas beban maka besar displacement juga semakin besar. Proses distribusi momen menunjukkan keberadaan bracing yang akan menimbulkan momen besar pada sambungan serta membantu mendistribusikan gaya. Pada distribusi gaya geser disimpulkan bahwa tiang pada baris pembebanan akan menerima gaya sangat besar serta penambahan jumlah tiang akan mengurangi besar gaya yang diterima oleh tiang pada baris pembebanan.Kata kunci: beban eksentrik, bracing, elevated pile cap, opensees
Studi Awal Amplifikasi Gerak Tanah Gempa untuk Universitas Indonesia (Depok) Lucky Suryajaya, Lingga Ekaputra; Prakoso, Widjojo Adi; Basarah, Yuamar Imarrazan; Pramono, Sigit
Jurnal Teknik Sipil Vol 31 No 2 (2024): Jurnal Teknik Sipil - Edisi Agustus
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2024.31.2.4

Abstract

Abstract This research is motivated by the frequent occurrence of earthquakes in Indonesia in recent years. Meanwhile, the common practice in determining soil and seismic parameters in Indonesia still heavily relies on various empirical studies. Therefore, this study aims to investigate soil and seismic parameters in Indonesia through the phenomenon of earthquake ground motion amplification, with a case study located at the University of Indonesia (Depok). The research methods employed include the analysis of earthquake recording data in the UI Forest at a depth of 300 meters, one-dimensional modeling using DEEPSOIL v7 software, and a comparative analysis of the ground motion recording results of the earthquake in Banten on January 14th, 2022, with a magnitude of 6.6 (low strain) on the surface of UI Forest and FMIPA UI. The research results show visible oscillations at the end of the ground acceleration output and a spike in the peak ground acceleration (PGA) value at around 30 meters in the uppermost layer, with periods and spectral acceleration higher than the expected recorded values. This indicates that the soil modeled based on correlation is softer than anticipated. In other words, the soil is stiffer than previously assumed based on the established correlations.
Study of Spun Pile to Pile Cap Connection with Steel Jacket Strengthening Hugen, Stevany Lydia Jedidjah; Orientilize, Mulia; Prakoso, Widjojo Adi; Lase, Yuskar
ASTONJADRO Vol. 12 No. 3 (2023): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v12i3.13204

Abstract

Spun piles in Indonesia are designed to behave as an elastic structure according to SNI8460:2017. The piles are designed with low confinement where the amount does not meet ASCE 7-16 requirements. Indonesia should apply a performance-based design for the bottom structure someday since the seismic demand tends to increase based on the current seismic risk map. Steel jackets are proposed to fulfill the need for transverse reinforcement, particularly at the connection region where the curvature demand is higher. The steel jacket was made from high-quality zincalume steel, a high-quality rolled steel that is customizable following the size of the spun pile and has a low cost. Experimental and numerical studies were conducted. A 500mm diameter spun pile was retrofitted with a steel jacket loaded vertically and horizontally. The experimental study applied the cyclic loading according to ACI374.2r, and 0.1fc'Ag vertical load was applied. The experimental study applied the cyclic loading according to ACI374.2r, and 0.1fc'Ag vertical load was applied. The experimental study found that the spun pile and grouted concrete interaction was not perfectly bonded. A further finite element study was conducted to understand the connection's performance thoroughly. Two parameters were investigated, the steel jacket's height and thickness. A numerical study performed pushover analysis on the 3D model using the ABAQUS software to see the effect of the height and moment-curvature analysis obtained from fiber section element from SAP software to study the impact of the thickness. The results were presented in terms of its strength and ductility.
Co-Authors Alfetra Henoch Tandita Callista, Vania Didik Haryadi Edison, Robert Hugen, Stevany Lydia Jedidjah I Nyoman Sukanta, I Nyoman Kamal, Fathia Handayani Lucky Suryajaya, Lingga Ekaputra Miranti Miranti Muhammad Reza Imansyah Orientilize, Mulia Sigit Pramono Supriyanto Rohadi, Supriyanto Wilmer, Reynaldo Nathaniel Yanreginata, Muhammad Amhar Wajdi Yuamar Imarrazan Basarah Yuskar Lase, Yuskar