Modifikasi Perencanaan Pondasi Gedung Tower 3 ITS Surabaya Menggunakan Pile-Raft Foundation

Illahi, Mohammad Odi Ridho (2025) Modifikasi Perencanaan Pondasi Gedung Tower 3 ITS Surabaya Menggunakan Pile-Raft Foundation. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Surabaya merupakan kota dengan perkembangan infrastruktur pendidikan yang pesat, sehingga mendorong kebutuhan akan gedung kuliah yang modern dan efisien. Gedung Tower 3 ITS yang memiliki 14 lantai dan tinggi 56 m. Berdasarkan uji Standard Penetration Test (SPT), tanah di lokasi proyek tergolong kelas situs sedang dengan karakteristik tanah yang bervariasi. Untuk mengatasi permasalahan daya dukung dan potensi penurunan tanah, digunakan sistem pondasi pile raft, yaitu kombinasi antara pondasi tiang dan pelat dasar (raft) guna mendistribusikan beban secara lebih merata dan mengontrol penurunan.
Metode pekerjaan dalam laporan ini mencakup studi literatur, pengumpulan data geoteknik dan struktur, pemodelan struktur menggunakan ETABS, serta pemodelan pondasi bawah menggunakan PLAXIS 2D. Perhitungan manual kapasitas daya dukung tiang dilakukan dengan perhitungan manual, dilanjutkan analisis distribusi beban, penurunan, dan momen pada pondasi. Selain itu, dilakukan perencanaan tulangan, peninjauan metode pelaksanaan konstruksi pondasi, serta perhitungan volume dan biaya material.
Perencanaan dilakukan melalui perhitungan manual kapasitas daya dukung tiang, serta pemodelan struktur atas menggunakan ETABS dan pondasi bawah menggunakan PLAXIS 2D. Total beban vertikal yang ditanggung pondasi mencapai 12.976,76 Ton. Pondasi menggunakan raft setebal 1 m dan pondasi tiang berdiameter 0,6 m dengan kedalaman 20 m dan jarak antar tiang 2,4 m. Hasil analisis menunjukkan bahwa penurunan maksimum dari ETABS adalah 12,69 mm dan dari PLAXIS 2D sebesar 3,75 cm, keduanya masih di bawah batas maksimum 16,2 cm sesuai SNI 8460:2017. Analisis juga menghasilkan desain penulangan untuk raft dan bored pile. Estimasi biaya material pondasi pileraft dengan borpilee adalah Rp 9.843.782.522, anggaran perencanaan pondasi pileraft dengan tiang pancang adalah Rp 7.788.079.525. dan anggaran perencanaan pondasi eksisting adalah Rp 8.419.460.191.
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Surabaya is a city experiencing rapid development in educational infrastructure, driving the need for modern and efficient academic buildings. One such project is the ITS Tower 3 building, which consists of 14 floors and reaches a height of 56 meters. Based on Standard Penetration Test (SPT) results, the soil at the project site is classified as a medium site class with varying soil characteristics. To address issues related to bearing capacity and potential settlement, a pile raft foundation system is employed—a combination of pile foundation and raft slab designed to distribute loads more evenly and control settlement.
The methodology in this report includes literature review, collection of geotechnical and structural data, structural modeling using ETABS, and foundation modeling using PLAXIS 2D. Manual calculations are performed to determine the bearing capacity of piles, followed by analysis of load distribution, settlement, and moment in the foundation. Additionally, reinforcement design, construction method review, and estimation of material volume and cost are conducted.
The design process involves manual calculation of pile bearing capacity, structural modeling of the superstructure using ETABS, and substructure modeling using PLAXIS 2D. The total vertical load supported by the foundation is 12.976,76 tons. The foundation consists of a 1-meter-thick raft and bored piles with a diameter of 0.6 meters, a depth of 20 meters, and a spacing of 2.4 meters. Analysis results show a maximum settlement of 12.69 mm from ETABS and 3.75 cm from PLAXIS 2D, both of which are below the maximum allowable limit of 16.2 cm according to SNI 8460:2017. The analysis also provides reinforcement designs for the raft and bored piles. The estimated material cost for the pile raft foundation with bored piles is IDR 9,843,782,522, while the budget for the pile raft foundation with driven piles is IDR 7,788,079,525, and the budget for the existing foundation design is IDR 8,419,460,191.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Pondasi Pile Raft, Etabs 21, Plaxis 2D, Settlement, Pondasi Tiang, Pile Raft Foundation,Etabs 21, Bor Pile
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction T Technology > TA Engineering (General). Civil engineering (General) > TA775 Foundations.
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Mohammad Odi Ridho Illahi
Date Deposited:	04 Aug 2025 02:59
Last Modified:	04 Aug 2025 02:59
URI:	http://repository.its.ac.id/id/eprint/126305

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