PERENCANAAN ULANG PADA JEMBATAN FLYOVER ALOHA SIDOARJO DENGAN MENGGUNAKAN CONCRETE SEGMENTAL BOX GIRDER DI STA 0+420 – STA 0+450

REDESIGN OF ALOHA SIDOARJO FLYOVER BRIDGE USING CONCRETE SEGMENTAL BOX GIRDER AT STA 0+420 – STA 0+450

Penelitian ini membahas perencanaan ulang Jembatan Flyover Aloha Sidoarjo, khususnya pada segmen STA 0+420 – STA 0+450, dengan mengganti struktur awal steel box girder menjadi concrete segmental box girder. Perencanaan ini dilatarbelakangi oleh kebutuhan untuk meningkatkan efisiensi, kekuatan, serta kemudahan perawatan struktur jembatan. Metode yang digunakan dalam penelitian ini mencakup analisis struktur menggunakan perangkat lunak SAP2000, serta perhitungan manual sesuai pedoman SNI dan referensi teori beton prategang. Fokus analisis meliputi desain penampang, pengaruh pembebanan, gaya prategang, kontrol tegangan dan lendutan, hingga kehilangan gaya prategang. Hasil perencanaan menunjukkan bahwa penggunaan concrete segmental box girder tipe single cellular diperoleh ukuran tinggi girder 1,625 m, panjang girder masing-masing sebelah kiri 3,4 m dan sebelah kanan 3,1 m, lebar girder 9 m, tebal slab atas 0,25 m, tebal slab bawah 0,25 m, dan untuk tebal web didaerah lapangan 0,5 m dan di tumpuan 1,5 m. Berdasarkan perhitungan sesuai peraturan yang tercantum dalam SNI 7833-2012 dan referensi desain seperti T.Y. Lin & Burns, total kehilangan gaya prategang diperkirakan sebesar 287,352 kN dengan persentase 15,45%. Setelah memperhitungkan semua kehilangan tersebut, gaya prategang efektif yang tersisa pada penampang adalah sebesar 49825,88 kN. Gaya prategang tersebut memberikan performa struktural yang memadai dan efisien dalam penggunaan material serta lebih ramah terhadap proses perawatan jangka panjang. Penelitian ini diharapkan dapat menjadi referensi dalam pengembangan metode konstruksi jembatan yang lebih berkelanjutan dan ekonomis di masa depan.

This research presents a structural redesign of the Aloha Sidoarjo Flyover Bridge, specifically within the segment STA 0+420 to STA 0+450, by replacing the original steel box girder system with a concrete segmental box girder configuration. The primary motivation for this redesign lies in enhancing structural efficiency, mechanical performance, and long-term maintainability. The methodology incorporates finite element analysis using SAP2000 software, complemented by manual calculations adhering to the Indonesian National Standards (SNI) and established theories of prestressed concrete. Key aspects of the analysis include cross-sectional design, load effects, prestressing force determination, stress and deflection control, and evaluation of prestress losses. The proposed single-cellular concrete segmental box girder yields a structural profile consisting of a 1.625 m girder height, segment lengths of 3.4 m (left) and 3.1 m (right), a width of 9 m, 0.25 m slab thicknesses (top and bottom), and web thicknesses of 0.5 m at midspan and 1.5 m at the support. Prestress loss calculations, based on SNI 7833-2012 and references such as T.Y. Lin & Burns, indicate a total loss of 287.352 kN, corresponding to 15.45% of the initial prestressing force. The effective remaining prestressing force is determined to be 49,825.88 kN. The results demonstrate that the redesigned system ensures adequate structural capacity, improved material efficiency, and reduced maintenance demands. Furthermore, the findings of this study highlight the potential of segmental box girder systems as a viable alternative for modern bridge construction, especially in densely populated urban settings where constructability, durability, and reduced life-cycle costs are critical. By integrating local design standards with international engineering principles, this research bridges theoretical design with practical implementation, offering valuable insights for engineers, planners, and policy-makers involved in sustainable transportation infrastructure. The study not only contributes to the academic discourse on bridge engineering but also provides a replicable model that may be adapted to similar infrastructure projects across Indonesia and other developing regions. This study contributes to the advancement of sustainable and cost-effective bridge engineering practices.