Studi Pengaruh Perubahan Dimensi Komponen Lantai Kendaraan Jembatan Cable Stayed Terhadap Stabilitas Aerodinamis

Nugrahainno, Fadillah (2024) Studi Pengaruh Perubahan Dimensi Komponen Lantai Kendaraan Jembatan Cable Stayed Terhadap Stabilitas Aerodinamis. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dengan bentang lebih dari 100 meter, perencanaan jembatan cable-stayed perlu memerhatikan pengaruh dari fenomena flutter akibat gaya aerodinamis pada dek jembatan. Fenomena ini dapat dicegah dengan mendesain gelagar menggunakan penampang boks dan lantai kendaraan orthotropic sehingga kekakuan torsional gelagar meningkat. Untuk meninjau kondisi keamanan jembatan terhadap fenomena tersebut, dapat dilakukan analisis stabilitas aerodinamis dengan salah satu parameter yang ditinjau yaitu rasio frekuensi alami akibat torsi dan lentur (fT/fB). Besar fT/fB yang terjadi pada jembatan harus lebih besar dari 1,5 dan minimum mendekati 2,5. Dalam perkembangan analisis stabilitas aerodinamis pada jembatan, jarang ditemui penelitian yang secara spesifik meneliti jembatan cable-stayed dengan dek orthotropic untuk menganalisis hubungan dimensi komponen jembatan serta pengaruhnya terhadap stabilitas aerodinamis. Maka, pada studi ini dilakukan analisis pengaruh perubahan dimensi komponen lantai kendaraan jembatan cable-stayed terhadap stabilitas aerodinamis yang meliputi penentuan variasi dimensi komponen jembatan rencana, analisis stabilitas aerodinamis jembatan berdasarkan variasi dimensi rencana, dan efek perubahan dimensi komponen jembatan terhadap stabilitas aerodinamis. Adapun objek yang ditinjau merupakan hasil studi ”Modifikasi Jembatan Kanor – Rengel Dengan Menggunakan Cable-Stayed Asymmetrical Single Plane System” tahun 2023. Komponen yang akan ditinjau adalah closed ribs dan open ribs dengan ketebalan 10, 11, dan 12 mm serta ketinggian dek yakni 2,6; 2,7, dan 2,8 m. Adapun analisis ini akan menggunakan software MIDASCIVIL untuk melakukan pemodelan dan mendapatkan hasil parameter stabilitas aerodinamis jembatan. Berdasarkan hasil analisis, didapatkan bahwa peningkatan ketebalan komponen ribs dapat meningkatkan fT/fB sehingga stabilitas aerodinamis jembatan meningkat, tetapi besar frekuensi alami akibat torsi (fT) dan lentur (fB) masing-masing menurun. Sementara itu, penambahan tinggi pada dek menyebabkan penurunan fT/fB, tetapi fT dan fB meningkat. Selain itu, perbedaan hasil pemodelan pada software MIDASCIVIL pada studi ini juga memberikan pengaruh yakni fT/fB pada penampang gelagar prismatis memiliki rasio lebih besar dibandingkan pada penampang gelagar non-prismatis. Maka, pada objek ini, upaya untuk meningkatkan fT/fB dapat dilakukan dengan meningkatkan ketebalan ribs dan model gelagar prismatis.
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With a span exceeding 100 meters, the design of cable-stayed bridges must consider the effects of flutter caused by aerodynamic forces on the bridge deck. This phenomenon can be mitigated by designing girders with box sections and orthotropic decks to increase the torsional rigidity of the girders. To assess the safety of the bridge against this phenomenon, an aerodynamic stability analysis can be conducted, with one of the parameters being the ratio of natural frequencies due to torsion and bending (fT/fB). The fT/fB ratio for the bridge must be greater than 1.5 and ideally close to 2.5. In the development of aerodynamic stability analysis for bridges, specific research on cable-stayed bridges with orthotropic decks to analyze the relationship between component dimensions and their impact on aerodynamic stability is rare. Therefore, this study analyzes the impact of changes in the dimensions of the vehicle deck components of cable-stayed bridges on aerodynamic stability. This includes determining the variation in the planned component dimensions, analyzing aerodynamic stability based on these dimensions, and evaluating the effect of dimensional changes on aerodynamic stability. The subject of this study is the “Modifikasi Jembatan Kanor – Rengel Dengan Menggunakan Cable-Stayed Asymmetrical Single Plane System” in 2023. The components examined are closed ribs and open ribs with thicknesses of 10, 11, and 12 mm, as well as deck heights of 2.6, 2.7, and 2.8 meters. The analysis will utilize MIDASCIVIL software for modeling and obtaining the aerodynamic stability parameters of the bridge. Based on the analysis results, it was found that increasing the thickness of the ribs enhances the fT/fB ratio, thereby improving the bridge’s aerodynamic stability, although the natural frequencies due to torsion (fT) and bending (fB) decrease. In contrast, increasing the deck height decreases the fT/fB ratio, but both fT and fB increase. Additionally, the modeling differences in MIDASCIVIL software in this study show that the fT/fB ratio for prismatic girder sections is higher compared to non-prismatic sections. Therefore, for this subject, efforts to improve the fT/fB ratio can be made by increasing the rib thickness and using prismatic girder models.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Cable-Stayed, Flutter, Rasio Frekuensi Alami, Dek Orthotropic, Closed Ribs, Open Ribs, Ketinggian Dek, Stabilitas Aerodinamis. Cable-Stayed Bridge, Flutter, Natural Frequencies Ratio, Orthotropic Deck, Closed Ribs, Open Ribs, Deck Height, Aerodynamic Stability.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design T Technology > TG Bridge engineering
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Civil Engineering > 22201-(S1) Undergraduate Theses
Depositing User:	Fadillah Nugrahainno
Date Deposited:	04 Aug 2024 13:01
Last Modified:	04 Aug 2024 13:01
URI:	http://repository.its.ac.id/id/eprint/110454

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