Asrofi, Cahyo Maulana (2024) Alternatif Desain Jembatan Overpass Interchange Kraksaan STA 6+468 pada Tol Probolinggo-Banyuwangi dengan Struktur Portal Bridge. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Proyek Pembangunan Jalan Tol Probolinggo-Banyuwangi Paket 1 memiliki panjang trase 12,88 km dengan lingkup pekerjaan berupa struktur jembatan, box culvert, dan underpass. Salah satu pekerjaan yang paling kritis adalah pada jembatan overpass interchange Kraksaan STA 6+468 memiliki panjang 128 meter dan lebar 17,8 meter. Perencanaan awal jembatan menggunakan struktur beton prategang dengan PCI Girder pada 4 span. Dalam penulisan ini akan dilakukan alternatif desain jembatan overpass interchange Kraksaan menggunakan sistem struktur portal bridge continous dengan box girder prategang. Penggunaan struktur ini dapat mengurangi momen lentur di lapaangan dan mengurangi jumlah pilar di tengah bentang sehingga lebih efisien. Direncanakan menjadi 3 span dengan 2 pilar miring dan 2 abutment, dimana panjang bentang utama portal adalah 64 meter. Perencanaan jembatan sesuai dengan SNI 1725-2016 dan RSNI T-12-2004. Dilakukan preliminary design dengan menentukan dimensi utama jembatan dan struktur sekunder, didapatkan tinggi box girder 4 meter (tumpuan) dan 2,6 meter (lapangan). Analisis pembebanan berupa beban permanen, beban lalu lintas, dan beban akibat aksi lingkungan, yang selanjutnya dimodelkan dengan program bantu Midas Civil 2022. Dilakukan analisis kapasitas penampang dengan tulangan, untuk mengontrol tiap segmen yang membutuhkan tendon prategang. Pada jembatan ini digunakan sistem struktur prategang dengan partially prestressed concrete, dimana perencanaan prategang ini mengombinasikan sistem prategang dengan full service load dan tulangan. Dengan sistem struktur beton prategang parsial ini akan menghemat jumlah kebutuhan strand yang dipakai. Dilakukan kontrol stabilitas struktur yang meliputi kontrol tegangan pada tahap transfer dan service, kontrol momen retak, kontrol momen batas, dan kontrol lebar retak maksimum. Alternatif perencanaan struktur ini mendapatkan hasil perancangan struktur berupa dimensi box girder, penempatan tendon, jumlah tendon, penentuan pondasi, penulangan dan pendetailan struktur yang dituangkan dalam bentuk tabel-tabel dan gambar-gambar. Pelaksanaan jembatan ini menggunakan metode cast in situ dengan perancah dan penarikan tendon dilakukan secara post-tensioned dengan jacking tendon yang dibelokkan keluar penampang untuk memudahkan stressing.
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The Probolinggo-Banyuwangi Toll Road Development Project Package 1 has a track length of 12.88 km with a scope of work in the form of bridge structures, box culverts and underpasses. One of the most critical works is on the Kraksaan STA 6+468 interchange overpass bridge which is 128 meters long and 17.8 meters wide. The initial planning of the bridge used a prestressed concrete structure with PCI Girder on 4 spans. In this paper, an alternative design for the Kraksaan overpass interchange bridge will be carried out using a continuous portal bridge structural system with prestressed box girders. The use of this structure can reduce bending moments in the field and reduce the number of pillars in the middle of the span so that it is more efficient. It is planned to be 3 spans with 2 inclined pillars and 2 abutments, where the length of the main span of the portal is 64 meters. Bridge planning is in accordance with SNI 1725-2016 and RSNI T-12-2004. Preliminary design was carried out by determining the main dimensions of the bridge and secondary structures, resulting in a box girder height of 4 meters (support) and 2.6 meters (field). Load analysis in the form of permanent loads, traffic loads and loads due to environmental action, which were then modeled using the Midas Civil 2022 auxiliary program. An analysis of the cross-sectional capacity with reinforcement was carried out, to control each segment that required prestressing tendons. This bridge uses a prestressed structural system with partially prestressed concrete, where the prestressing plan combines a prestressing system with full service load and reinforcement. With this partial prestressed concrete structure system, it will save the number of strands used. Structural stability control is carried out which includes stress control at the transfer and service stages, crack moment control, limit moment control, and maximum crack width control. This structural planning alternative obtains structural design results in the form of box girder dimensions, tendon placement, number of tendons, determination of foundations, reinforcement and structural details which are outlined in the form of tables and drawings. The construction of this bridge uses the cast in situ method with scaffolding and the tendon pulling is carried out post-tensioned by jacking the tendons which are deflected out of the cross section to facilitate stressing.
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