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Abstrak :
[ABSTRAK
Beban gempa merupakan salah satu beban yang harus diperhatikan dalam perancangan jembatan. Jembatan harus dirancang sedemikian hingga dapat memiliki kinerja yang optimal. Hal ini diukur dari parameter kekuatan serta daktilitas jembatan itu. Oleh karena itu, analisa yang mendalam hingga perilaku inelastis struktur jembatan perlu dilakukan. Dengan analisa non-linear pushover, perilaku inelastis jembatan akibat beban gempa rencana dapat diprediksi. Kemudian hasil analisa tersebut dapat menjadi acuan apakah jembatan tersebut sudah optimal atau memerlukan penanganan lebih lanjut seperti perkuatan struktur. Pada studi ini jembatan yang menjadi objek penelitian adalah jembatan cable-stayed di Maluku. Berdasarkan studi yang dilakukan, jembatan ini memiliki kekuatan yang memadai namun memiliki daktilitas yang cukup rendah. Hal ini terlihat dari besarnya beban ultimit yang dapat diterima serta besarnya displacement yang terjadi tepat sebelum jembatan mengalami kegagalan.

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ABSTRACT
Earthquake load is one of the load that must be considered in the design of the bridge. The bridge should be designed so that can have an optimum performance. It is measured on the parameters of the strength and ductility of the bridge. Therefore, in-depth analysis of the inelastic behaviour of the structure of the bridge needs to be done. Inelastic behaviour of the bridge due to earthquake load can be predicted with non-linear pushover analysis. Then, the results of the analysis can be a reference to whether the bridge is optimum or require further treatment such as structure retrofitting. The bridge that becomes the object of this study is a cable-stayed bridge in Maluku. Based on study conducted, this bridge has adequate strength but has low ductility level. It is evident from the ultimate load that can be received and the amount of displacement that occurs just before the bridge failed., Earthquake load is one of the load that must be considered in the design of the bridge. The bridge should be designed so that can have an optimum performance. It is measured on the parameters of the strength and ductility of the bridge. Therefore, in-depth analysis of the inelastic behaviour of the structure of the bridge needs to be done. Inelastic behaviour of the bridge due to earthquake load can be predicted with non-linear pushover analysis. Then, the results of the analysis can be a reference to whether the bridge is optimum or require further treatment such as structure retrofitting. The bridge that becomes the object of this study is a cable-stayed bridge in Maluku. Based on study conducted, this bridge has adequate strength but has low ductility level. It is evident from the ultimate load that can be received and the amount of displacement that occurs just before the bridge failed.]

Abstrak :
ABSTRAK Pada tahun 2017, Kementrian PUPR melakukan revisi peta gempa yang meliputi pembaharuan sumber sumber gempa baru. Akibat meningkatnya potensi gempa, maka terjadi peningkatan seismic demand dalam perancangan bangunan tahan gempa. Perancangan bangunan tahan gempa sering menggunakan konsep performance based design (PBD). Konsep PBD mengijinkan terjadinya kerusakan pada bangungan melalui mekanisme sendi plastis. Konsep PBD belum dapat diaplikasikan pada struktur bawah, karena sulit untuk direparasi. PBD dapat dipelajari melalui analisa pushover, yaitu dengan membebani struktur secara lateral sampai struktur tersebut mengalami kegagalan. Penelitian ini memodelkan spun pile berdiameter 450 dan 600 mm produksi dari salah satu BUMN di Indonesia. Spun pile tertanam dalam tanah kohesif berjenis soft clay sedalam 20 m. Koneksi antara spun pile dengan pile cap dianggap kaku, sehingga dimodelkan sebagai jepit. Ujung dari pile menumpu pada tanah keras yang dimodelkan sebagai sendi. Tanah dimodelkan sebagai nonlinear spring yang menambah kekakuan pada struktur. Pemodelan dilakukan dengan menggunakan SAP2000 V21. Tujuan dari penelitian ini adalah mencari kekuatan, daktilitas, dan proses terbentuknya sendi plastis. Terdapat tiga buah parameter yang diujikan untuk mendapatkan gambaran kapasitas spun pile. Pertama, dilakukan variasi luas tulangan pada beton pengisi spun pile. Kemudian, kekakuan tanah dibedakan berdasarkan nilai undrained shear strength. Selanjutnya, parameter yang diuji adalah efek beban aksial yang berbeda. Hasil dari penelitian menunjukkan bahwa penambahan pada ketiga parameter tersebut meningkatkan kekuatan pile secara keseluruhan sebesar 2-13%. Disisi lain, nilai daktilitas meningkat seiring dengan penambahan tulangan beton pengisi sebesar 2-15% , namun berkurang 2-10% pada penambahan kekakuan tanah dan beban aksial.

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ABSTRACT In 2017, the Ministry of Public Works and Housing revised the earthquake map which included renewing of new earthquake sources. Seismic demands in the design of earthquake resistant buildings increase due to the increased potential of the earthquake. The design of earthquake resistant buildings often uses the concept of performance based design (PBD). The PBD concept allows damage to buildings through plastic hinge mechanism. The PBD concept cannot yet be applied to the lower structure, because its complications in repair. PBD can be studied through pushover analysis, by applicating lateral load until the structure fails.This research investigates 450 and 600 mm diameter spun pile produced by one of the state-owned corporation in Indonesia. The spun pile is embedded in cohesive soil of soft clay type as deep as 20 m. The connection between the spun pile and the pile cap is a rigid connection, so it is modeled as fix. The pile tip rests on hard soil which is modeled as pin. The soil is modeled as nonlinear springs which adds rigidity to the structure. Modeling is done using SAP2000 V21. The purpose of this research is to observe the capacity, ductility, and formation of plastic hinge. There are three parameters tested in this study to obtain the capacity of pile. First, a variation of spun pile infilled concrete reinforcement area. Then, the stiffness of the soil which varies by the value of undrained shear strength. Furthermore, the parameters tested are different axial load effects.The results of this study indicate that increasing the three parameters resulted in raising overall pile strength by 2-13%. On the other hand, the ductility value increases with the addition of reinforced concrete reinforcement by 2-15%, but decreases by 2-10% with the increase of soil stiffness and axial load.