Studi Pergeseran Slab On Pile Jembatan Eksisting Serta Alternatif Perkuatan Dan Desain Jembatan Baru (Studi Kasus: Jembatan Kali Tenggang A, Semarang)

Wati, Erna Novita (2026) Studi Pergeseran Slab On Pile Jembatan Eksisting Serta Alternatif Perkuatan Dan Desain Jembatan Baru (Studi Kasus: Jembatan Kali Tenggang A, Semarang). Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangunan Pier 08 Jalan Tol Semarang-Demak Seksi 1A yang berhimpit dengan struktur eksisting slab on pile Jembatan Kali Tenggang A Bentang 3 menyebabkan terjadinya pergeseran pada struktur jembatan eksisting. Penelitian ini bertujuan untuk mengevaluasi pengaruh tahapan pembangunan terhadap daya dukung, deformasi, dan momen lentur pondasi eksisting, menilai efektivitas perkuatan menggunakan sheet pile, serta merancang alternatif desian pondasi jembatan yang aman. Analisis dilakukan melalui pemodelan PLAXIS 2D dengan pendekatan tahapan konstruksi. Parameter yang dianalisis meliputi daya dukung aksial, deformasi vertikal dan horizontal, serta momen lentur tiang pancang. Hasil analisis menunjukkan bahwa daya dukung aksial pondasi eksisting menurun dari 813 kN pada kondisi awal menjadi 786,10 kN setelah pembangunan struktur Pier 08. Deformasi vertikal meningkat dari 3,22 cm menjadi 5,96 cm, sedangkan deformasi horizontal mencapai 2,9 cm pada tahap timbunan dan melampaui batas layanan SNI sebesar 2,5 cm. Momen lentur meningkat signifikan dari 11,18 kNm menjadi 96,82 kNm, namun masih berada di bawah nilai momen retak (Mcrack). Hasil evaluasi menunjukkan bahwa perkuatan menggunakan sheet pile tipe JIS III tidak memberikan pengaruh signifikan terhadap pengendalian deformasi struktur eksisting. Sebagai alternatif, dimodelkan desain pondasi slab on pile dengan kedalaman tiang 55 m dan diameter 0,6 m serta 0,8 m memenuhi kriteria layanan, dengan diameter 0,8 m menunjukkan kinerja yang lebih optimal. Urutan pekerjaan yang direkomendasikan untuk meminimalkan dampak terhadap struktur eksisting adalah pemasangan sheet pile sedalam 15 m, penimbunan platform setinggi 1 m, dilanjutkan dengan pembangunan pondasi dan struktur Pier 08.
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The construction of Pier 08 of the Semarang–Demak Toll Road Section 1A, located in close proximity to the existing slab on pile structure of Kali Tenggang Bridge A Span 3, has caused displacement of the existing bridge structure. This study aims to evaluate the influence of construction stages on the axial bearing capacity, deformation, and bending moment of the existing foundation, to assess the effectiveness of sheet pile reinforcement, and to develop a safe alternative bridge foundation design. The analysis was carried out using two-dimensional numerical modeling with PLAXIS 2D, incorporating a staged construction approach. The analyzed parameters include axial bearing capacity, vertical and horizontal deformations, and bending moment of the pile foundation. The results indicate that the axial bearing capacity of the existing foundation decreased from 813 kN in the initial condition to 786.10 kN after the construction of Pier 08. Vertical deformation increased from 3.22 cm to 5.96 cm, while horizontal deformation reached 2.9 cm during the embankment stage, exceeding the serviceability limit specified in the Indonesian standard (SNI) of 2.5 cm. The bending moment increased significantly from 11.18 kNm to 96.82 kNm; however, it remained below the cracking moment (Mcrack). The evaluation results show that reinforcement using JIS III sheet piles does not provide a significant effect in controlling the deformation of the existing structure. As an alternative solution, slab on pile foundation designs with a pile depth of 55 m and diameters of 0.6 m and 0.8 m were modeled and found to satisfy serviceability criteria, with the 0.8 m diameter piles exhibiting more optimal performance. The recommended construction sequence to minimize adverse impacts on the existing structure consists of installing 15 m deep sheet piles, followed by a 1 m platform embankment, and subsequently constructing the Pier 08 foundation and superstructure.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Daya dukung aksial, deformasi y dan x, momen lentur, Plaxis 2D axial bearing capacity, deformatin y-x, bending moment, PLAXIS 2D
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA780 Piles and pile-driving
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering
Depositing User:	Erna Novita Wati
Date Deposited:	27 Jan 2026 03:56
Last Modified:	27 Jan 2026 03:56
URI:	http://repository.its.ac.id/id/eprint/130678

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