DECK ON PILE CARGO BERTH STRUCTURE DESIGN IN THE PORT OF ILWAKI, SOUTHWEST MALUKU REGENCY, MALUKU PROVINCE

• Main Author: Filius Santoso, Jason
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/55482
• Institution: Institut Teknologi Bandung

Ilwaki is one of the primary urban areas of Wetar Island, which is a part of Southwest Maluku Regency, Maluku Province. The geographical condition surrounding Wetar Island is dominated by other islands, therefore requiring strong connectivity within the maritime sector to support economic growth and the welfare of inhabitants. An example of a water transport facility located in Ilwaki is the Port of Ilwaki, which has the hierarchy of a regional feeder port within the regency. The berthing facility in the Port of Ilwaki is currently suffering from deterioration caused by lack of upkeeping along with no maintenance of the fenders protecting the structure from the impacts of a berthing vessel. This Final Project is composed to create a structural design of a deck on pile jettytype berth with the aim of enhancing the existing structure used for loading and unloading general cargo in the Port of Ilwaki. The design covers the general dimensions, structural elements, structural modeling, reinforcements of structural elements, and soil bearing capacity of two main components of the structure—the berth itself and the trestle which connects the berth to the land. The initial stage of the design is the collection and processing of environmental data, such as the tides, currents, winds, waves, and soil. Additional operational data are also compiled to finally calculate the values of horizontal and vertical loads on the structure. Based on this initial calculation, a preliminary design is established and modeled using a structural analysis and design software, SAP2000. The result of the structural analysis is then optimized to achieve optimal values of unity check ratio (UCR), which is taken as 0,7 to 1,0. The deflections of the structure are also assessed and need to be designed within the permissible values. The internal structural forces in the optimized design are used to design reinforcements of the structural elements, while the base reactions are used to calculate the required piling depth based on the soil bearing capacity. The designed berth has an overall length of 112 m with a width of 17 m, while the trestle is 37 m long and 6 m wide. Both structures have the crown height of +3,85 meters above the lowest tidal elevation. The designed structural elements consist of beams, slabs, piles, and pile caps. Based on the optimized design, a steel pipe pile with a diameter of 812,2 mm and a wall thickness of 11,91 mm is used for the berth structure, while the trestle uses a 762 mm diameter steel pipe pile with a wall thickness of 9,53 mm. The steel piles of the berth are piled to a depth of 10 m below the seabed, while only 4 m deep is needed in the trestle. Unity check ratio values of the berth piles fall in the range of 0,69 to 0,94, while the trestle piles have the values of 0,85 to 0,9. Assessment of deflections of the berth and trestle structure caused by combinations of loads shows that all deflection values are within the allowable limit. Design standards and procedures applied in this Final Project include the Technical Standards and Commentaries for Port and Harbour Facilities in Japan published by The Overseas Coastal Area Development Institute of Japan (OCDI) in 2020, Standar Nasional Indonesia (SNI), British Standard (BS), American Institute of Steel Construction (AISC) standard, American Concrete Institute (ACI) standard, American Society of Civil Engineers (ASCE) standard, American Association of State Highway and Transportation Officials (AASHTO) standard, and other valid supporting standards and product catalogues. Softwares utilized for computations include ERGTide, Delft3D, SAP2000, dan PCA Column.