Kurniyawan, Toni and Nurhidayatullah, Eka Faisal (2020) ANALISIS PERBANDINGAN STRUKTUR JEMBATAN TIPE I-GIRDER DENGAN U-GIRDER BETON PRATEGANG Studi Kasus : Jembatan Mojorejo Kecamatan Nglipar Kabupaten Gunungkidul COMPARISON ANALYSIS OF I-GIRDER TYPE BRIDGE WITH PRE-TENSE CONCRETE U-GIRDER A Case Study: Mojorejo Bridge, Nglipar District, Gunungkidul Regency. Tugas Akhir thesis, University Technology Yogyakarta.
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Abstract
ABSTRAK Pengunaan jembatan konstruksi beton prategang semakin bayak dipergunakan, karena kemudahan dalam pelaksanaannya dan beratnya yang lebih ringan dibandingankan jembatan beton yang lainnya. Untuk mendapatkan struktur jembatan bahan beton prategang yang terbaik maka perlu dilakukan analisis dari beberapa alternatif. Struktur jembatan prategang umumnya dibentuk dari kumpulan balok gelagar atau girder yang disusun secara sejajar beraturan. Girder adalah bagian struktur yang berfungsi menyalurkan semua beban yang berada di atasnya dan berat sendiri girder. Girder sendiri memeliki banyak bentuknya antara lain I Girder, U Girder, T Girder, Box Girder. Studi kasus penelitian dilakukan pada Jembatan Mojorejo, Nglipar, Gunungkidul, Yogyakarta. Jembatan dengan lebar sembilan meter dan panjang girder 55,8 meter yang terbagi oleh dua pilar disisi kanan dan kiri mempunyai bentang 12,6 meter dan dibagian tengah 30,6 meter. Dalam penelitian ini akan digunakan studi komparasi antara struktur beton prategang I Grider dan U Grider dari segi kekuatan, kebutuhan struktur, lendutan, kehilangan prategang, jumlah strands, dan jumlah tendon dalam girder. Metode yang digunakan dalam penelitian ini menggunakan SAP2000 untuk mengetahui gaya dalam dan excel untuk menghitung safety factor, momen nominal, geser nominal, kehilangan tegangan, desain struktur, lendutan pada setiap girder dan membandingan hasil analisis tersebut. Perbandingan yang dilakukan menggunakan I girder kondisi eksisting jembatan Mojorejo dengan U girder yang direncanakan. Perencanaan mengacu pada SNI 1725:2016 tentang Pembebanan untuk Jembatan, SNI 2833:2016 tentang Perencanaan Jembatan Tahan Gempa dan peraturan terkait. Hasil analisis perhitungan struktur atas jembatan Mojorejo dengan I girder kondisi eksisting didapat safety factor momen 1.492 dan safety factor geser 1,071. Struktur I girder didesain menggunakan lima girder, luas total beton 33.475 cm2, volume total beton 102.433.500 cm3, tinggi penampang 170 cm, total tendon 25 tendon, total strands cable 225 strands, dan total kehilangan tegangan 435,289 MPa atau 28,426%. Nilai momen nominal yang dikerahkan sebesar 88337,370 kNm serta total nilai gaya geser sebesar 8463,370 kN. Sedangkan untuk struktur U girder didesain dengan menggunakan tiga girder, luas total beton 31.248 cm2, volume total 95.618.880 cm3, tinggi penampang 140 cm, total tendon 18 tendon, total strands cable 3348 strands, dan total kehilangan tegangan 485,029 MPa atau 33,112% dengan safety factor momen 1.444 dan safety factor geser 1,026 menghasilkan total nilai momen nominal sebesar 73680,729 kNm serta total nilai gaya geser sebesar 6895,962 kN. Nilai lendutan yang terjadi pada I girder adalah 18,049 mm dan pada lendutan U girder adalah 32,2105 mm. Dari hasil yang didapat bahwa I girder lebih kuat, aman, dan lebih murah dibandingan dengan dengan U girder. Kata kunci: Struktur, Jembatan, Beton Prategang, Girder, Safety Factor Abstract The use of pre-tense concrete construction bridges is increasingly being used, because of the ease of implementation and lighter weight compared to other concrete bridges. To get the best pre-tense concrete material bridge structure, it is necessary to analyze several alternatives. Pre-tense bridge structures are generally formed from a collection of girder beams or girders arranged in an orderly parallel. The girder is a part of the structure that functions to distribute all the loads above it and the girder's own weight. Girder itself has many forms including I Girder, U Girder, T Girder, Box Girder. The case study research was conducted at the Mojorejo Bridge, Nglipar, Gunungkidul, Yogyakarta. The bridge had a width of nine meters and a girder length of 55.8 meters which is divided by two pillars on the right and left has a span of 12.6 meters and in the middle of 30.6 meters. In this research, a comparative study was used between the pre-tense concrete structures of I Grider and U Grider in terms of strength, structural requirements, deflection, loss of prestress, the number of strands, and the number of tendons in the girder. The method used in this study used SAP2000 to determine internal forces and excel to calculate the safety factor, nominal moment, nominal shear, stress loss, structural design, deflection of each girder and to compare the results of the analysis. Comparisons were made using the existing I girder of the Mojorejo bridge with the planned U girder. Planning referred to SNI 1725: 2016 concerning Load for Bridges, SNI 2833: 2016 concerning Earthquake Resistant Bridge Planning and related regulations. The results of the analysis of the calculation of the structure of the Mojorejo bridge with I girder in the existing conditions obtained a moment safety factor of 1.492 and a shear safety factor of 1.071. The I girder structure was designed using five girders, the total area of concrete was 33,475 cm2, the total volume of concrete was 102,433,500 cm3, the cross section height was 170 cm, the total tendon was 25 tendons, the total cable strands was 225 strands, and the total stress loss was 435,289 MPa or 28,426%. The nominal moment value that was deployed is 88337.370 kNm and the total value of the shear force was 8463.370 kN. Whereas the U girder structure was designed using three girders, the total area of concrete was 31,248 cm2, the total volume was 95,618,880 cm3, the cross section height was 140 cm, the total tendons were 18 tendons, the total cable strands were 3348 strands, and the total stress loss was 485.029 MPa or 33.112% with safety factor moment 1,444 and shear safety factor 1,026 resulting in a total nominal moment value of 73680,729 kNm and a total value of shear force of 6895,962 kN. The deflection value that occurred in the I girder was 18.049 mm and that of the U girder was 32.2105 mm. From the results obtained, the I girder was stronger, safer, and cheaper than the U girder. Key words: Structure, Bridge, Strategic Concrete, Girder, Safety Factor
| Item Type: | Thesis (Skripsi, Tugas Akhir or Kerja Praktek) (Tugas Akhir) |
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Fakultas Sains dan Teknologi > S1 Teknik Sipil |
| Depositing User: | Kaprodi S1 Teknik Sipil UTY |
| Date Deposited: | 22 Oct 2020 03:02 |
| Last Modified: | 22 Oct 2020 03:02 |
| URI: | http://eprints.uty.ac.id/id/eprint/6009 |
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