Pribadi, Eleazar Immanuel (2026) Analisis Pengaruh Interaksi Tanah-Pondasi-Struktur (ITPS) Terhadap Optimasi Desain Pondasi Dangkal Pada Jembatan LRT Cililitan Zona C1TM 029 dan Zona C1TM 031. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pengembangan infrastruktur Light Rail Transit (LRT) yang masif menuntut penerapan rekayasa nilai (Value Engineering) guna mereduksi biaya konstruksi. Namun, upaya tersebut sering terkendala oleh dominasi desain pondasi tiang bor yang terlalu konservatif demi memenuhi kriteria batas layan (Service Limit State) yang ketat. Penelitian ini bertujuan untuk menyelesaikan permasalahan efisiensi tersebut dengan menguji validitas penggunaan pondasi dangkal untuk Jembatan LRT menggunakan metode analitis yang menyederhanakan interaksi tanah-struktur, yang mana hal ini memicu ketidakakuratan prediksi deformasi. Penelitian dilakukan di dua lokasi pilar Jembatan LRT Cililitan, yaitu Zona C1TM 029 dan Zona C1TM 031. Melalui pendekatan berbasis kinerja, analisis Interaksi Tanah-Pondasi-Struktur (ITPS) diintegrasikan menggunakan model Winkler Area Spring pada ETABS serta simulasi numerik Metode Elemen Hingga (MEH) 3D memanfaatkan model konstitutif Mohr–Coulomb (MC) untuk menangkap perilaku non-linear tanah. Solusi teknis dicapai melalui iterasi rasio geometri pondasi (L/B) guna memitigasi risiko keamanan guling dan penurunan. Hasil penelitian membuktikan bahwa pendekatan ITPS dan MEH mampu mengeliminasi desain konservatif, di mana metode analitis terbukti memprediksi penurunan secara berlebih (overestimate) dengan rata-rata deviasi sebesar 49,3% pada kondisi beban statis dan 64,6% pada kondisi beban gempa. Lebih lanjut, studi ini memvalidasi kelayakan penggunaan pondasi dangkal untuk infrastruktur kritis LRT dengan keberhasilan mereduksi kebutuhan volume beton bertulang yang signifikan dibandingkan desain tiang bor eksisting, yakni sebesar 80,8% untuk Zona C1TM 029 dengan dimensi pondasi 10 m × 16 m × 2 m dan 68,6% untuk Zona C1TM 031 dengan dimensi pondasi 8 m × 12 m × 2 m.
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The massive development of Light Rail Transit (LRT) infrastructure demands the implementation of Value Engineering to reduce construction costs. However, this effort is often constrained by the predominance of highly conservative bored pile foundation designs intended to meet strict Service Limit State (SLS) criteria. This study aims to address this inefficiency issues by examining the validity of using shallow foundation for LRT bridges evaluated through conventional analytical methods that simplify soil-structure interaction, which leads to inaccuracies in deformation prediciton. The research was conducted at two pier locations on the Cililitan LRT Bridge, specifically in Zones C1TM 029 and Zones C1TM 031. Adopting a perfomance-based approach, Soil-Structure Interaction (SSI) analysis was integrated using the Winkler Area Spring model in ETABS alongside 3D Finite Element Method (FEM) numerical simluations utilizing the Mohr-Coulomb (MC) constitutive model to capture non-linear soil behavior. Technical solutions were achieved through the iteration of foundation geometric ratios (L/B) to mitigate overturning and settlement risks. The result demonstrate that SSI and FEM approaches successfully eliminate design conservatism, as the analytical method was proven to overestimate settlement predictions with an average deviation of 49.3% under static loading and 64.6% under seismic loading. Furthermore, this study validates the feasibility of shallow foundations for critical LRT infrastructure, successfully achieving a significant reduction in reinforced concrete volume compared to the existing bored pile foundation by 80.8% for Zones C1TM 029 with a foundation dimension of 10 m × 16 m × 2 m, and 68.6% for Zones C1TM 031 with a foundation dimension of 8 m × 12 m × 2 m.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Interaksi Tanah-Struktur (ITPS), Pondasi Dangkal, Model Winkler, Metode Elemen Hingga, Jembatan LRT, Soil-Structure Interaction (SSI), Shallow Foundation, Winkler Model, Finite Element Method, LRT Bridge |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA775 Foundations. |
| Divisions: | Faculty of Civil Engineering and Planning > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | Eleazar Immanuel Pribadi |
| Date Deposited: | 23 Jul 2026 15:53 |
| Last Modified: | 23 Jul 2026 15:53 |
| URI: | http://repository.its.ac.id/id/eprint/136593 |
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