RAHMADIANTO, ADITYA (2025) ANALISIS PERILAKU STRUKTUR CEROBONG TERHADAP GEMPA MENTAWAI 2007 DENGAN METODE RIWAYAT WAKTU STUDI KASUS: PROYEK PLTU JAWA 9 & 10 CILEGON - BANTEN. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Indonesia is located at the convergence of three major tectonic plates—Indo-Australian, Eurasian, and Pacific—which makes it highly prone to seismic activity. One critical structure affected by earthquakes is the chimney of a coal-fired power plant, which is typically tall and slender. This study aims to analyze the dynamic response of a chimney structure subjected to the 2007 Mentawai earthquake using the linear time history method. The case study focuses on the 261.5-meter-high chimney of the Jawa 9 & 10 CFSPP in Cilegon, Banten. The model was built in SAP2000 using shell elements, with ground motion data from the Mentawai earthquake (HNE, HNN, and HNZ components) as input. Static analysis results show a maximum vertical displacement of 40.09 mm and a maximum support reaction of 266,761.3 kN under gravity loads. Modal analysis produced a fundamental period of 4.453 seconds, with cumulative translational mass participation exceeding 90%. Time history analysis revealed maximum displacements of ±71.55 mm in the X direction and ±96.017 mm in the Y direction, both well below the design limit of Δ ≤ H/300 (871.67 mm). The maximum stress responses due to the earthquake were 21.55 MPa (axial), 10.40 MPa (hoop), and 5.45 MPa (shear), all of which remain within the allowable limits of 29.75 MPa, 29.75 MPa, and 5.67 MPa, respectively. Therefore, the chimney structure is considered safe under seismic loading. This research can serve as a technical reference for evaluating or redesigning chimney structures in seismicprone regions. Keywords: chimney, time history method, Mentawai earthquake, SAP2000, dynamic analysis. Indonesia merupakan wilayah rawan gempa karena berada pada pertemuan tiga lempeng tektonik besar, yaitu Indo-Australia, Eurasia, dan Pasifik. Salah satu struktur penting yang harus dievaluasi terhadap pengaruh gempa adalah cerobong pada PLTU yang memiliki bentuk tinggi dan ramping. Penelitian ini bertujuan menganalisis respons dinamis struktur cerobong terhadap gempa Mentawai 2007 menggunakan metode riwayat waktu linier. Studi dilakukan pada cerobong PLTU Jawa 9 & 10 dengan tinggi 261,5 m. Pemodelan dilakukan pada SAP2000 dengan elemen shell dan input akselerogram gempa Mentawai arah HNE, HNN, dan HNZ. Hasil analisis statis menunjukkan lendutan maksimum akibat beban gravitasi sebesar 40,09 mm dan reaksi tumpuan maksimum sebesar 266.761,3 kN. Dari analisis ragam, periode fundamental tercatat 4,453 detik dengan partisipasi massa kumulatif translasi melampaui 90%. Analisis dinamis menghasilkan simpangan maksimum ±71,55 mm pada arah X dan ±96,017 mm pada arah Y, berada jauh di bawah batas izin Δ ≤ H/300 yaitu 871,67 mm. Tegangan maksimum akibat gempa sebesar 21,55 MPa untuk aksial, 10,40 MPa untuk hoop, dan 5,45 MPa untuk geser, masih berada di bawah batas izin yang masing-masing adalah 29,75 MPa, 29,75 MPa, dan 5,67 MPa. Dengan demikian, struktur cerobong dinyatakan aman terhadap beban gempa. Penelitian ini dapat menjadi referensi teknis dalam evaluasi maupun perencanaan ulang struktur cerobong di wilayah rawan gempa. Kata kunci: cerobong, metode riwayat waktu, gempa Mentawai, SAP2000, analisis dinamis.
| Item Type: | Thesis (S1) |
|---|---|
| Call Number CD: | FT/SIP. 25 176 |
| NIM/NIDN Creators: | 41123110072 |
| Uncontrolled Keywords: | cerobong, metode riwayat waktu, gempa Mentawai, SAP2000, analisis dinamis. |
| Subjects: | 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 624 Civil Engineering/Teknik Sipil 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 627 Hydraulic Engineering/Rekayasa Hidrolik 600 Technology/Teknologi > 690 Buildings/Teknik Bangunan > 697 Heating, ventilating, air-conditioning engineering/Teknik Pemanasan Rumah, Teknik Pemanas Ruangan, Teknik Ventilasi dan Pendingin Ruangan AC > 697.7 Chimneys and Flues/Teknik Cerobong Asap dan Pipa Asap |
| Divisions: | Fakultas Teknik > Teknik Sipil |
| Depositing User: | khalimah |
| Date Deposited: | 10 Oct 2025 07:38 |
| Last Modified: | 10 Oct 2025 07:38 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/99007 |
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