Studi Pengaruh External Prestressing Terhadap Perilaku Statis Dan Dinamis Jembatan Layang Gelagar Boks Komposit

Darisman, Huwaiza I (2024) Studi Pengaruh External Prestressing Terhadap Perilaku Statis Dan Dinamis Jembatan Layang Gelagar Boks Komposit. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Jembatan layang sebagai bentuk lain dari jembatan tentunya melalui proses perencanaan yang mempertimbangkan aspek kekuatan, stabilitas struktur, kemudahan pelaksanaan serta aspek lainnya yang mempengaruhi desain jembatan. Keputusan perencanaan yang diambil dalam aspek-aspek tersebut akan mempengaruhi perilaku struktur nantinya ketika berada dalam kondisi layan. Jembatan yang direncanakan bisa saja belum mampu memenuhi persyaratan dalam perilaku struktur ketika sudah dibangun. Dalam kasus ini, diambil spesimen jembatan yang dimodelkan dengan bentang efektif 58 meter dengan tipe jembatan gelagar boks komposit dengan tebal pelat beton efektif 318 mm. Model jembatan dilakukan analisis terhadap perilaku statis berupa lendutan dan dinamis berupa frekuensi natural. Analisis dilakukan dengan bantuan software midasCIVIL dengan analisis frame. Dari hasil analisis yang dilakukan, spesimen jembatan menghasilkan lendutan sebesar 77,856 milimeter dan frekuensi natural sebesar 1,596 Hz. Berdasarkan evaluasi, perilaku dinamis berupa lendutan masih melebihi lendutan izin yaitu 72,5 mm. Sedangkan untuk frekuensi natural masih di bawah angka empiris yang berkisar antar 1,75 Hz – 2,15 Hz. Untuk menangani hal tersebut, dapat direncanakan perkuatan terhadap jembatan yang berjenis gelagar boks komposit tersebut. External prestressing adalah salah satu metode perkuatan jembatan yang dapat diterapkan dan memiliki salah satu keuntungan yaitu tidak mengganggu lalu lintas jembatan. Dalam perencanaan external prestressing, perlu dilakukan studi pengaruh external prestressing terhadap perilaku statis dan dinamis struktur jembatan. Dalam studi, akan dipelajari beberapa variasi dari external prestressing. External prestressing direncanakan dengan gaya jacking 3108 kN yang bekerja pada konfigurasi 19 strand layout Draped berjarak terjauh dari sayap bawah sebesar 1000 mm dengan variasi satu, tiga, dan lima deviator. Variasi dengan satu deviator menghasilkan lendutan akibat beban BTR sebesar 77,67 mm (turun 0,24% dari jembatan model) serta nilai frekuensi natural sebesar 1,644 Hz (naik 3,04% dari jembatan model). Variasi dengan tiga deviator menghasilkan lendutan akibat beban BTR sebesar 71,57 mm (turun 8% dari jembatan model) serta nilai frekuensi natural sebesar 1,657 Hz (naik 3,75% dari jembatan model). Perkuatan external prestressing dengan lima deviator menghasilkan lendutan akibat beban BTR sebesar 70,3 mm (turun 9,7% dari jembatan model), serta nilai frekuensi natural sebesar 1,661 Hz (naik 4 % dari jembatan model). Dari hasil studi tersebut, didapatkan bahwa, perkuatan external prestressing memberikan pengaruh yang signifikan untuk perilaku statis (lendutan) karena spesimen mampu memenuhi tegangan izin. Sedangkan, untuk perilaku dinamis (frekuensi natural), berpengaruh namun tidak signifikan karena belum bisa mencapai angka empiris frekuensi natural.
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An elevated bridge, as a form of bridge, undergoes a planning process that considers aspects of strength, structural stability, ease of construction, and other factors influencing the bridge design. The planning decisions in these aspects affect the structural behavior once the bridge is in service. A planned bridge may not meet the required structural behavior upon construction. In this case, a bridge specimen with an effective span of 58 meters and a composite box girder bridge type with an effective concrete slab thickness of 318 mm was modeled. The bridge model was analyzed for static behavior, including deflection, and dynamic behavior, including natural frequency. The analysis was performed using midasCIVIL software with a frame analysis. The analysis results showed that the bridge specimen had a deflection of 77,856 millimeters and a natural frequency of 1,596 Hz. Based on the evaluation, the dynamic behavior in terms of deflection exceeded the allowable deflection of 72,5 mm, while the natural frequency was below the empirical range of 1,75 Hz to 2,15 Hz. To address this, reinforcement planning for the composite box girder bridge was considered. External prestressing is one method of bridge reinforcement that can be applied without disrupting bridge traffic. In planning external prestressing, it is necessary to study its impact on the static and dynamic behavior of the bridge structure. The study examined several variations of external prestressing. External prestressing was planned with a jacking force of 3108 kN acting on a 19-strand draped layout configuration, with the farthest distance from the bottom flange being 1000 mm and variations of one, three, and five deviators. The one-deviator variation resulted in a BTR load deflection of 77,67 mm (a 0,24% decrease from the bridge model) and a natural frequency of 1,644 Hz (a 3,04% increase from the bridge model). The three-deviator variation resulted in a BTR load deflection of 71,57 mm (an 8% decrease from the bridge model) and a natural frequency of 1.657 Hz (a 3,75% increase from the bridge model). The five-deviator external prestressing reinforcement resulted in a BTR load deflection of 70,3 mm (a 9,7% decrease from the bridge model) and a natural frequency of 1,661 Hz (a 4% increase from the bridge model). The study concluded that external prestressing reinforcement significantly affects static behavior (deflection) as the specimen meets the allowable stress. However, the impact on dynamic behavior (natural frequency) is significant but insufficient to reach the empirical natural frequency.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Deviator, External Prestressing, Jembatan Gelagar Boks Komposit, Perilaku Statis, Perilaku Dinamis, Bridge, Deviator, Dynamic Behavior, External Prestressing, Static Behavior, Tendon Layout
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA492.G5 Girders T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TG Bridge engineering T Technology > TG Bridge engineering > TG362 Box girder bridges--Design and construction.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Huwaiza Ismail Darisman
Date Deposited:	05 Aug 2024 01:44
Last Modified:	05 Aug 2024 01:44
URI:	http://repository.its.ac.id/id/eprint/111789

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