Widiastomo, Muhammad Alwi (2020) Analisis Respon Spektrum Pada Perpanjangan Lengan Girder Ship Unloader Crane. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Permasalahan utama yang terjadi di PLTU Sukabumi adalah terhambatnya pasokan batubara yang dikarenakan muatan yang dapat diangkut oleh kapal tongkang relatif kecil. Pembangkit listrik tenaga uap berencana untuk meningkatkan pengiriman pasokan batubara dengan menggunakan kapal vessel kapasitas 40,000 DWT. Kapal vessel dengan kapasitas 40,000 DWT memiliki ketahanan terhadap ombak besar jika dibandingkan dengan kapal tongkang dengan kapasitas 12,000 DWT. Kapal vessel memiliki lebar yang lebih besar dibandingkan dengan kapal tongkang sehingga Jetty perlu diperkuat agar mampu disandari oleh kapal vessel. Oleh karena itu jetty mengalami pelebaran kearah laut. Penambahan lebar pada jetty dan besarnya lebar kapal vessel mengakibatkan ship unloader crane tidak dapat menjangkau titik pemindahan. Ship unloader crane perlu dilakukan peningkatan berupa extensi girder agar dapat mencapai titik pemindahan. Ekstensi girder dapat mempengaruhi performa dari SUC, maka dari itu sangat diperlu dilakukan analisis kekuatan struktur crane terhadap beban maksimal operasi.
Penelitian ini dilakukan untuk mengetahui ketahanan crane pada beban operasi terhadap gempa yang terjadi. Pemodelan 3D dilakukan menggunakan blueprint kondisi existing dan menambah panjang lengan girder boom crane, terdapat 3 variasi panjang lengan. Panjang lengan 3 meter, 6 meter, dan 9 meter. Simulasi dilakukan dengan menggunakan software Ansys Workbench Respon Spectrum. Analisa Modal dilakukan untuk mendefinisikan goyangan fundamental. Selanjutnya memberikan beban gempa pada simulasi Respon Spectrum.
Kedua metode mampu membuktikan bahwa crane mampu menahan gempa sebesar 2,07 MN setara dengan 5,68 SR pada static ekivalen, dan grafik respon spektrum 2,5g-2,8g dibuktikan dengan tidak adanya gaya reaksi pada tumpuan yang bernilai 0 atau bernilai negatif.
Beban gempa dengan input respon spektrum jenis tanah lunak mempunyai potensi beban tertinggi dilihat dari deformasi dan gaya reaksi yang dihasilkan. Kedua adalah jenis tanah sedang, berikutnya tanah keras, dan yang potensi paling kecil beban gempanya adalah batuan. Besarnya ekstensi yang ditambahkan mengakibatkan berkurangnya ketahanan SU crane terhadap gempa. Perlu dilakukan penguatan struktur pada struktur support boom, karena pada bagian ini stress meningkat secara signifikan.
Kata kunci: Ship Unloader Crane, Respon Spektrum, Statik Ekivalen, Gempa
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The steam power plant plans to increase coal supply shipments using vessels with a capacity of 40,000 DWT. A vessel with a capacity of 40,000 DWT has resistance to big waves when compared to a barge with a capacity of 12,000 DWT. A vessel has a larger width than a barge. The jetty needs to be strengthened so that it can be berthed by vessels, therefore the jetty is expanding towards the sea. The increase in the width of the jetty and the width of the vessel resulted in the ship unloader crane being unable to reach the moving point. Ship unloader cranes need to be increased in the form of girder extensions to reach the moving point. Girder extension can affect the performance of SUC; therefore, it is very necessary to analyze the strength of the crane structure against the maximum operating load.
This research was conducted to determine the resistance of the crane to the operating load against the earthquake that occurred. 3D modeling is done using a blueprint of the existing conditions and increasing the length of the boom crane girder arm, there are 3 variations of the arm length. Arm length of 3 meters, 6 meters, and 9 meters. The simulation was performed using Ansys Workbench Response Spectrum software. Capital analysis is performed to define fundamental sway. Furthermore, giving earthquake loads in the Response Spectrum simulation.
Both methods are able to prove that the crane is able to withstand an earthquake of 2.07 MN which is equivalent to 5.68 SR in the static equivalent, and the response spectrum graph of 2.5g-2.8g is proven by the absence of a reaction force on the pedestal which is 0 or negative.
Earthquake loads with the input response spectrum for soft soil types have the highest load potential seen from the deformation and reaction force generated. The second is medium soil type, then hard soil, and the one with the smallest potential for earthquake load is rock. The added size of the extension resulted in reduced earthquake resistance of the SU crane. It is necessary to strengthen the structure of the boom support structure, because in this part the stress increases significantly.
Keywords: Ship Unloader Crane, Response Spectrum, Static Equivalent, Earthquake.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Ship Unloader Crane, Respon Spektrum, Statik Ekivalen, Gempa. Ship Unloader Crane, Response Spectrum, Static Equivalent, Earthquake. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design T Technology > TH Building construction > TH1095 Earthquakes and building T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Muhammad Alwi Widiastomo |
| Date Deposited: | 28 Aug 2020 03:58 |
| Last Modified: | 05 Jan 2024 03:26 |
| URI: | http://repository.its.ac.id/id/eprint/81301 |
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