Raenaldo, Kevin (2025) Analisis Numerik Tegangan Segmen Box Girder Akibat Pengangkuran Tendon Prategang Eksentris Pada Jembatan Box Girder Balanced Cantilever. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kasus kerusakan retak diagonal pada web jembatan box girder balanced cantilever telah banyak ditemukan di dunia. Di Indonesia sendiri kerusakan serupa juga terjadi di salah satu Jembatan di Pulau Jawa. Hasil evaluasi struktur tahun 2022 menemukan bahwa retak diagonal pada web box girder terjadi di tengah bentang utama dan bentang tepi. Lokasi retak merupakan area overlap antara pengangkuran tendon cantilever di sisi atas dengan tendon menerus jembatan di sisi bawah box. Penelitian terdahulu telah mempelajari retak diagonal pada web box girder dapat terjadi akibat tegangan geser tambahan akibat pengangkuran tendon prategang. Tegangan geser akibat pengangkuran tendon ini sering tidak diperhitungkan dalam perhitungan desain yang menggunakan analisis elemen 1D. Dalam penelitian ini dilakukan analisis pada segmen box girder dengan model elemen 2D yang diverifikasi dengan pendekatan numerik untuk mengidentifikasi distribusi tegangan dan potensi penyebab retak pada web box girder. Nilai tegangan pada web box girder yang terdiri dari tegangan normal, tegangan geser dan tegangan tarik utama (principal tensile stress) dievaluasi terhadap batasan tegangan ijin disyaratkan di Indonesia. Evaluasi nilai tegangan tarik utama digunakan untuk mempelajari potensi retak yang dapat terjadi dan mengkonfirmasi hasil pemetaan retak yang dilakukan di lapangan. Hasil analisis dan evaluasi menunjukkan bahwa tegangan geser akibat pengangkuran tendon prategang meningkatkan tegangan geser total yang terjadi pada web box girder dengan presentase sumbangan hingga 46.6% dari nilai tegangan geser web total. Sebaran tegangan geser akibat pengangkuran tendon prategang terkonsentrasi pada area angkur prategang di sisi atas dan sisi bawah web box girder. Hasil evaluasi tegangan tarik utama menunjukkan lokasi retak pada jembatan di lapangan sesuai dengan lokasi dengan nilai tegangan tegangan tarik utama yang telah melebihi batas persyaratan desain
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Cases of diagonal crack damage on balanced cantilever box girder bridge webs have been widely found in the world. In Indonesia itself, similar damage also occurred on one of the bridges on Java Island. The results of the 2022 structural evaluation found that diagonal cracks in the box girder web occurred in the middle of the main span and the edge span. The location of the crack is the overlap area between the cantilever tendon anchorage on the upper side and the continuous bridge tendon on the lower side of the box. Previous studies have studied that diagonal cracks in the box girder web can occur due to additional shear stress due to prestressing tendon anchorage. The shear stress due to tendon anchorage is often not taken into account in design calculations using 1D element analysis. In this study, an analysis was carried out on the box girder segment with a 2D element model that was verified using a numerical approach to identify the stress distribution and potential causes of cracks in the box girder web. The stress value on the box girder web consisting of normal stress, shear stress and principal tensile stress was evaluated against the allowable stress limits required in Indonesia. Evaluation of the principal tensile stress value is used to study the potential for cracks that can occur and confirm the results of crack mapping carried out in the field. The results of the analysis and evaluation show that the shear stress due to the anchorage of the prestressing tendon increases the total shear stress that occurs on the box girder web with a contribution percentage of up to 46.6% of the total web shear stress value. The distribution of shear stress due to the anchorage of the prestressing tendon is concentrated in the prestressing anchorage area on the upper and lower sides of the box girder web. The results of the main tensile stress evaluation show the location of cracks on the bridge in the field according to the location with the main tensile stress value that has exceeded the design requirement limit
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | box girder, FEM, pengangkuran, prategang, tegangan geser, anchorage zone, prestress, shear stress |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction T Technology > TE Highway engineering. Roads and pavements > TE7 TG300 Bridges--Design and construction. T Technology > TG Bridge engineering > TG362 Box girder bridges--Design and construction. |
| Divisions: | Faculty of Vocational > Civil Engineering Maintenance and Restoration of Buildings (S2) |
| Depositing User: | Kevin Raenaldo |
| Date Deposited: | 31 Jan 2025 04:19 |
| Last Modified: | 31 Jan 2025 04:19 |
| URI: | http://repository.its.ac.id/id/eprint/117324 |
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