Azizi, Muhammad Devin (2026) Analisis Numerik Respons Dinamis dan Stabilitas Pipa HDPE terhadap Beban Dinamis Vibratory Roller dengan Mitigasi EPS Geofoam Menggunakan Metode Elemen Hingga. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pertumbuhan infrastruktur di kawasan perkotaan padat sering kali memaksa instalasi pipa utilitas High-Density Polyethylene (HDPE) dilakukan pada parit yang sangat dangkal (30 cm). Kondisi ini menempatkan struktur pipa dalam risiko tinggi terhadap paparan rambatan gelombang dinamis dari alat berat konstruksi, seperti vibratory roller. Oleh karena itu, penelitian ini bertujuan untuk mengevaluasi respons dinamis pipa HDPE yang terkubur dangkal, sekaligus memvalidasi efektivitas penerapan inovasi selubung penuh (full encasement) Expanded Polystyrene (EPS) Geofoam sebagai sistem mitigasi getaran. Pendekatan numerik komparatif berbasis Metode Elemen Hingga (Finite Element Method) diaplikasikan menggunakan perangkat lunak ANSYS untuk menyimulasikan interaksi kompleks antara tanah, struktur pipa, dan material pelindung. Analisis dilakukan melalui serangkaian simulasi terintegrasi, mulai dari Static Structural untuk menentukan prakondisi tegangan, Modal Analysis untuk mengekstraksi frekuensi alami, hingga Harmonic Response dan Transient Structural menggunakan algoritma Mode Superposition (MSUP). Pembebanan dieksekusi secara stasioner berdenyut (stationary pulsating load) pada mode getaran kuat (strong vibration) sebesar 28 Hz untuk menyimulasikan kondisi operasional paling ekstrem. Hasil komputasi menunjukkan bahwa pada sistem tanpa mitigasi, Peak Vibration Velocity (PVV) menembus angka 142,68 mm/s dengan intensitas regangan yang tinggi. Penerapan selubung EPS Geofoam terbukti efektif memicu mekanisme compressible inclusion yang mendispersikan energi kejut secara lateral, sehingga PVV berhasil diredam secara drastis sebesar 73,4% menjadi 37,996 mm/s, yang mana sudah berada di bawah ambang batas mutlak 50 mm/s. Redaman energi ini secara simultan menyusutkan regangan tekan maksimum menjadi 9.044,9 με dan regangan tarik menjadi 7.210,7 με. Pencapaian ini berhasil menaikkan Safety Factor (SF) dinamis sistem menjadi 4,5 dan 6,9. Kesimpulannya, selubung EPS Geofoam terbukti sebagai solusi rekayasa yang valid, protektif, dan andal untuk menjamin integritas struktural pipa HDPE jangka panjang.
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The rapid growth of urban infrastructure frequently necessitates the installation of flexible High-Density Polyethylene (HDPE) utility pipes ini exceptionally shallow trenches (30 cm). This condition exposes the pipe structure to a high risk of dynamic wave propagation from heavy construction equipment, such as vibratory roller. Therefore, this study aims to evaluate the dynamic response of shallow-buried HDPE pipes and to validate the effectiveness of a full encasement innovation Expanded Polystyrene (EPS) Geofoam as a vibration mitigation system. A comparative numerical approach based on the Finite Element Method (FEM) was applied using ANSYS software to simulate the complex soil-pipe-protector interaction. The analysis was conducted through a series of integrated simulations, starting from Static Structural to determine stress preconditions, Modal Analysis to extract natural frequencies, and Harmonic Response along with Transient Structural utilizing the Mode Superposition (MSUP) algorithm. The loading was executed as a stationary pulsating load at a strong vibration mode of 28 Hz to simulate the most extreme operational conditions. Computational results show that in the unmitigated system, the Peak Vibration Velocity (PVV) reached 142.68 mm/s with high strain intensity. The application of the EPS Geofoam encasement effectively triggered a compressible inclusion mechanism that laterally dispersed the shockwaves, drastically attenuating the PVV by 73,4% to 37,996 mm/s, safely below the absolute threshold of 50 mm/s. This kinetic energy reduction simultaneously suppressed the maximum compressive strain to 9,044.9 με and the tensile strain to 7,210.7 με. Consequently, the dynamic Safety Factor (SF) of the system was increased to 4.5 and 6.9. Respectively. In conclusion, the EPS Geofoam encasement is proven to be a valid, protective, and reliable engineering solution to guarantee the long-term structural integrity of HDPE pipes.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Metode Elemen Hingga, Pipa HDPE, EPS Geofoam, Beban Dinamis, Peak Vibration Velocity, Finite Element Method, HDPE Pipe, EPS Geofoam, Dynamic Load, Peak Vibration Velocity |
| Subjects: | T Technology > T Technology (General) > T57.62 Simulation T Technology > TH Building construction > TH6840 Piping installation. Pipefitting T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines. |
| Divisions: | Faculty of Vocational > Mechanical Industrial Engineering (D4) |
| Depositing User: | Muhammad Devin Azizi |
| Date Deposited: | 04 Aug 2026 04:10 |
| Last Modified: | 04 Aug 2026 04:10 |
| URI: | http://repository.its.ac.id/id/eprint/142385 |
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