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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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Journal : Astonjadro

 1 
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.
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