Naufal, Rizqullah Yusuf (2020) Analisis Keandalan Struktur Lepas Pantai Terpancang Terhadap Keruntuhan Akibat Gempa. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Dalam tugas akhir ini, analisis keandalan dilakukan pada platform jacket untuk mengetahui kemungkinan platform jacket akan runtuh jika terjadi gempa. Dengan menggunakan spektra akselerasi pada lokasi tempat platform jacket berada, dapat ditemukan catatan gempa dengan spektra akselerasi yang serupa dengan spektra akselerasi di lokasi platform jacket. Dari tiap – tiap catatan gempa tersebut diambil Peak Ground Acceleration (PGA) untuk digunakan sebagai input dalam perhitungan analisis seismik. Dari perhitungan analisis seismik akan didapatkan harga base shear dari platform jacket. Selanjutnya dilakukan tes goodness of fit antara data base shear hasil analisis seismik dengan beberapa distribusi probabilitas teoritis untuk mengetahui distribusi probabilitas yang paling cocok dengan data base shear yang ada. Dengan menentukan suatu harga base shear sebagai batas, kemungkinan platform jacket runtuh ketika mengalami gempa dapat dihitung. Penentuan harga base shear yang akan dijadikan batas dilakukan dengan melakukan analisis pushover pada platform jacket. Dalam tugas akhir ini, platform jacket yang akan dianalisis adalah Platform KLB. Hasil analisis pushover menunjukkan harga base shear Platform KLB sebesar 5195,72 kips pada arah X dan 4566,22 kips pada arah Y. Data base shear hasil analisis seismik paling cocok dengan distribusi probabilitas Weibull. Dengan menjadikan harga base shear hasil analisis pushover yang lebih kecil sebagai batas, Platform KLB memiliki kemungkinan 5,75% untuk runtuh jika terjadi gempa.
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In this final project, reliability analysis will be performed on jacket platform to know the probability jacket platform will collapse if an earthquake occurs. Using spectral acceleration at jacket platform’s site, earthquake records with similar spectral acceleration can be found. The Peak Ground Acceleration (PGA) from each of the records then used to perform several seismic analysis to obtain base shear values of jacket platform. By performing goodness of fit test with known probability distribution, it can be determined which probability distribution fit the base shear data. With certain base shear value as a limit, the probability of failure, the case when jacket platform will collapse if an earthquake occurs, can be calculated. Base shear limit of jacket platform calculated by performing pushover analysis on nonlinear finite element model of jacket platform. KLB Platform which located at Java Sea will be the subject of this final project. Pushover analysis done on KLB Platform shows that base shear values of KLB Platform are 4566.22 kips in X direction and 5195.72 kips in Y direction. The data of base shear values fit with Weibull probability distribution. Using the smaller value between the two base shear result from the pushover analysis as base shear limit, the probability of failure then calculated using Weibull distribution’s cumulative density function formula. The result shows that KLB Platform has 5.75% chance to collapse if an earthquake occurs.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSKe 620.004 52 Nau a-1 2020 |
| Uncontrolled Keywords: | keandalan, platform jacket, base shear, keruntuhan, gempa |
| Subjects: | V Naval Science > V Naval Science (General) V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Rizqullah Yusuf Naufal |
| Date Deposited: | 21 Dec 2023 02:16 |
| Last Modified: | 21 Dec 2023 02:16 |
| URI: | http://repository.its.ac.id/id/eprint/73229 |
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